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JP7507049B2 - Water Absorption Test Method - Google Patents

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JP7507049B2
JP7507049B2 JP2020158266A JP2020158266A JP7507049B2 JP 7507049 B2 JP7507049 B2 JP 7507049B2 JP 2020158266 A JP2020158266 A JP 2020158266A JP 2020158266 A JP2020158266 A JP 2020158266A JP 7507049 B2 JP7507049 B2 JP 7507049B2
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fine aggregate
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water absorption
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俊斉 林
淳 齋藤
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Hazama Ando Corp
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本願発明は、コンクリートやモルタルなどに用いられる細骨材に関するものであり、より具体的には、細骨材の吸水率を求める装置と方法に関するものである。 This invention relates to fine aggregates used in concrete, mortar, etc., and more specifically to an apparatus and method for determining the water absorption rate of fine aggregates.

コンクリートは鋼材とともに最も重要な建設材料のひとつであり、ダム、トンネル、橋梁といった土木構造物や、集合住宅、オフィスビルなどの建築構造物をはじめ、様々な構造物に用いられている。このコンクリート構造物は、あらかじめ工場等で製作されて所定の場所まで運搬されることもあるが、土木構造物や建築構造物の場合、所定の場所(現場)で直接構築されることが多い。いずれにしろ、セメントと水、骨材、混和剤等を練り混ぜた状態のコンクリート(フレッシュコンクリート)を型枠の中に投入し、コンクリートの硬化を待って型枠を外すことでコンクリート構造物は構築される。 Along with steel, concrete is one of the most important construction materials, and is used in a variety of structures, including civil engineering structures such as dams, tunnels, and bridges, and architectural structures such as apartment buildings and office buildings. These concrete structures may be manufactured in advance in a factory and transported to the designated location, but in the case of civil engineering and architectural structures, they are often constructed directly at the designated location (site). In any case, concrete structures are constructed by pouring concrete (fresh concrete), which is a mixture of cement, water, aggregate, admixtures, etc., into a formwork, waiting for the concrete to harden, and then removing the formwork.

コンクリートは、構築する構造物等の重要性や耐久性、あるいは施工性などに応じて配合設計が行われ、あわせて目標品質が得られるようセメントはもちろん、骨材や混和剤なども各種規定に基づいて選別される。骨材のうち細骨材は、その寸法が規定されるほか、吸水率などその物性も規定されることがある。吸水率とは、材料がどの程度の水を含むことができるかという性質を表す指標であり、吸水率が大きい細骨材ほど、内部に多くの空隙を有することからすり減りやすく、またコンクリート凍結時には破裂しやすく、さらに細骨材が多くの水分を含むことからポンプ等で圧送し難いといった問題が生じる。そこで、コンクリートの細骨材として砂を利用する場合はその吸水率が3.5%以下、砕砂を利用する場合はその吸水率が3.0%以下として規定されることがある。 The mix design of concrete is based on the importance, durability, and workability of the structure to be constructed, and cement, aggregates, admixtures, etc. are selected based on various regulations to achieve the target quality. Fine aggregates are regulated for their dimensions, and their physical properties, such as water absorption, may also be regulated. Water absorption is an index that indicates how much water a material can contain. Fine aggregates with a high water absorption rate have more voids inside, making them more likely to wear out, more likely to burst when the concrete freezes, and more difficult to pump with a pump because they contain a lot of water. For this reason, when sand is used as fine aggregate for concrete, its water absorption rate is sometimes regulated to be 3.5% or less, and when crushed sand is used, its water absorption rate is sometimes regulated to be 3.0% or less.

一般的に細骨材の吸水率は、「JIS A 1109 細骨材の密度及び吸水率の試験方法」に準拠して求められる。以下、その手順について説明する。まず、試料(細骨材)を24時間吸水させ、その試料を平らな面に薄く広げて均等に乾燥させる。そして、表面に水分が若干残る程度の試料を、非吸水性の材料で製作されたフローコーンに緩く詰め、自重だけを利用して突き棒で試料を25回突き、フローコーンを静かに鉛直に引き上げる。試料の乾燥の程度を変えながら、この一連の作業を繰り返し行い、はじめて試料がスランプしたとき、その試料を表面乾燥飽水状態として評価する。 Generally, the water absorption rate of fine aggregate is determined in accordance with "JIS A 1109 Test method for density and water absorption rate of fine aggregate." The procedure is explained below. First, the sample (fine aggregate) is allowed to absorb water for 24 hours, then the sample is spread thinly on a flat surface and dried evenly. Then, the sample, which still has a small amount of moisture remaining on the surface, is loosely packed into a flow cone made of a non-absorbent material, and the sample is poked 25 times with a poker using only its own weight, and the flow cone is gently pulled up vertically. This series of steps is repeated while varying the degree of dryness of the sample, and when the sample slump for the first time, it is evaluated as being in a surface dry, water-saturated state.

表面乾燥飽水状態の試料が得られると、その質量(以下、便宜上「表乾質量」という。)を計量する。一方、絶対乾燥状態とされた試料(細骨材)の質量(以下、便宜上「絶乾質量」という。)も把握しておく。なお絶対乾燥状態とは、試料を100~110℃の温度で定質量となるまで乾燥し、細骨材の内部に含まれている自由水が取り去られた状態のことである。そして、表乾質量と絶乾質量に基づいて試料の吸水率を求める。(式1)は吸水率Q(%)を求める数式であり、式中のmは表乾質量(g)、mは絶乾質量(g)である。

Figure 0007507049000001
Once a sample with a dry surface and saturated with water is obtained, its mass (hereinafter, for convenience, referred to as "surface dry mass") is measured. Meanwhile, the mass of the sample (fine aggregate) in an absolutely dry state (hereinafter, for convenience, referred to as "bone dry mass") is also determined. An absolutely dry state refers to a state in which the sample is dried at a temperature of 100-110°C until it reaches a constant mass, and the free water contained within the fine aggregate has been removed. The water absorption of the sample is then calculated based on the surface dry mass and the bone dry mass. Equation 1 is the formula for calculating the water absorption Q (%), where m s is the surface dry mass (g) and m a is the bone dry mass (g).
Figure 0007507049000001

ところで、上記した手順(JIS A 1109)によって細骨材の吸水率を求める試験方法には、大きく3つの問題を指摘することができる。第1に、「はじめて試料がスランプしたとき」を表面乾燥飽水状態として評価するわけであるが、その評価はいわば主観的であり、したがって熟練度などに伴う評価者の個人差を排除することができない。第2に、一連の作業を繰り返し行うことから、その間湿布等によって養生は行うものの試料の完全な乾燥状態(湿潤状態)を維持することは難しい。第3に、良質な川砂や山砂が近年減少しているため砕砂を用いることも多いが、川砂等と砕砂ではフローコーンを引き上げたときの挙動が異なり、「はじめて試料がスランプしたとき」の評価をより困難にしている。 However, there are three major problems with the test method for determining the water absorption rate of fine aggregate using the above procedure (JIS A 1109). First, the "first time the sample slump" is evaluated as a surface dry water-saturated state, but the evaluation is subjective, so it is impossible to eliminate the individual differences between evaluators due to their level of experience. Second, because a series of operations is repeated, it is difficult to keep the sample completely dry (wet), although the sample is cured with a wet compress or the like. Third, crushed sand is often used because good quality river sand and mountain sand have been decreasing in recent years, but the behavior of river sand and crushed sand when the flow cone is pulled up is different, making the evaluation of "first time the sample slump" more difficult.

正確に表面乾燥飽水状態の評価ができないと、当然ながら正しい表乾質量mを求めることができず、また表乾質量mに基づいて求められる吸水率Qも正確な値が得られない。 If the surface dry water-saturated state cannot be accurately evaluated, it is obvious that the correct surface dry mass m s cannot be calculated, and the water absorption Q calculated based on the surface dry mass m s cannot be calculated accurately.

図4は、正確な表乾質量m(表中のNo11)との較差と、その較差によって生じた吸水率Qの誤差を示す対比図である。この図では、No11に表面乾燥飽水状態のデータを示しており、すなわち正しい吸水率Qは2.35%である。また表中のNo1~No10のデータは、正確な表乾質量mよりも小さな表乾質量mを求めたデータであり、No12~No21のデータは、正確な表乾質量mよりも大きな表乾質量mを求めたデータである。表中のNo1では表乾質量mを正確値よりも1.0g小さい値として求めており、その結果、吸水率Qは正確値よりも0.2%小さい値が得られている。また表中のNo21では表乾質量mを正確値よりも1.0g大きい値として求めており、その結果、吸水率Qは正確値よりも0.21%大きい値が得られている。このように、表乾質量mの正確値との較差は吸水率Qの値に大きな影響を与え、換言すれば吸水率Qは表乾質量mの変化に対して極めて感度が高いといえる。 FIG. 4 is a comparison diagram showing the difference from the accurate surface dry mass m s (No. 11 in the table) and the error of the water absorption rate Q caused by the difference. In this figure, No. 11 shows data of the surface dry water-saturated state, that is, the correct water absorption rate Q is 2.35%. Data No. 1 to No. 10 in the table are data obtained by obtaining a surface dry mass m s smaller than the accurate surface dry mass m s , and data No. 12 to No. 21 are data obtained by obtaining a surface dry mass m s larger than the accurate surface dry mass m s . In No. 1 in the table, the surface dry mass m s is obtained as a value 1.0 g smaller than the accurate value, and as a result, the water absorption rate Q is obtained as a value 0.2% smaller than the accurate value. In No. 21 in the table, the surface dry mass m s is obtained as a value 1.0 g larger than the accurate value, and as a result, the water absorption rate Q is obtained as a value 0.21% larger than the accurate value. Thus, the difference between the surface dry mass m s and the accurate value has a large effect on the value of the water absorption Q. In other words, the water absorption Q is extremely sensitive to changes in the surface dry mass m s .

「JIS A 1109」によって細骨材の吸水率を求める試験方法については、これまでにも問題視されることがあり、その問題を解決すべく種々の改良技術が提案されてきた。例えば特許文献1では、水面からの吸収板の高さを調節することで吸収板に載置した細骨材から表面水を除去し、これにより細骨材を表面乾燥状態に調製する技術について提案している。 The test method for determining the water absorption rate of fine aggregate according to "JIS A 1109" has been questioned in the past, and various improved techniques have been proposed to solve the problem. For example, Patent Document 1 proposes a technique for removing surface water from fine aggregate placed on an absorbent plate by adjusting the height of the absorbent plate from the water surface, thereby preparing the fine aggregate to have a dry surface.

特開2005-291887号公報JP 2005-291887 A

既述したとおり「JIS A 1109」によれば、評価者によって表面乾燥飽水状態の評価にばらつきが生じるなどいくつか問題がある。そして、正確な表乾質量mを把握しなければ、換言すると正しいタイミングで表面乾燥飽水状態を評価しなければ、求められる細骨材の吸水率には相当の誤差を含んでしまう。 As mentioned above, there are some problems with JIS A 1109, such as variations in the evaluation of the surface dry water-saturated state depending on the evaluator. Furthermore, unless the surface dry mass m s is accurately grasped, in other words, unless the surface dry water-saturated state is evaluated at the correct timing, the calculated water absorption rate of the fine aggregate will contain a considerable error.

本願発明の課題は、従来技術が抱える問題を解決することであり、すなわち、従来に比して小さい誤差で吸水率を求めることができる吸水率試験装置、及び吸水率試験方法を提供することである。 The objective of the present invention is to solve the problems of the conventional technology, that is, to provide a water absorption test device and a water absorption test method that can determine the water absorption rate with a smaller error than conventional methods.

図4を見ると、既述したとおり吸水率Qは表乾質量mの変化に高い感度で反応するが、これに対して表乾密度は表乾質量mの変化にそれほど反応しない。例えば、表中のNo1における表乾密度は正確値と+0.01g/mの誤差しかなく、表中のNo21における表乾密度も正確値と-0.01g/mの誤差しかない。これは、表面乾燥飽水状態の評価のタイミングが多少ずれたとしても、表乾密度に関しては正しい値からそれほど誤差が生じないことを意味している。本願発明は、吸水率Qを表乾質量mに基づいて求める従来手法(式1)に代えて、表乾密度に基づいて求められる表面水率によって吸水率Qを算出する、という点に着目してなされたものであり、これまでにない発想に基づいて行われた発明である。 4, as described above, the water absorption rate Q responds with high sensitivity to changes in the surface dry mass m s , whereas the surface dry density does not respond so much to changes in the surface dry mass m s . For example, the surface dry density in No. 1 in the table has an error of only +0.01 g/m 3 from the correct value, and the surface dry density in No. 21 in the table also has an error of only -0.01 g/m 3 from the correct value. This means that even if the timing of the evaluation of the surface dry water-saturated state is slightly off, the surface dry density does not deviate much from the correct value. The present invention has been made with a focus on the point that the water absorption rate Q is calculated from the surface water rate calculated based on the surface dry density instead of the conventional method (Equation 1) of calculating the water absorption rate Q based on the surface dry mass m s, and is an invention made based on a new idea.

本願発明の吸水率試験装置は、細骨材試料の吸水率を求める試験装置であって、上部に開口部を有する容器本体と上蓋、注水管、排出口、撹拌手段を備えたものである。このうち容器本体は、細骨材試料と水を収容するものであり、上蓋は、容器本体の開口部を開閉することができるものである。また注水管は、開口部を上蓋で閉じた状態で容器本体内に注水することができるのものであり、排出口は、開口部を上蓋で閉じかつ注水管から注水される状態で容器本体内の空気を排出することができるのものである。そして撹拌手段は、容器本体内に細骨材試料と水を入れた状態で、骨材試料を攪拌し得るものである。なお容器本体は、外側から内側を目視することができる材料で形成される。 The water absorption test device of the present invention is a test device for determining the water absorption rate of fine aggregate samples, and is equipped with a container body having an opening at the top, a top lid, a water injection pipe, a discharge port, and a stirring means. Of these, the container body is for containing fine aggregate samples and water, and the top lid is capable of opening and closing the opening of the container body. The water injection pipe is capable of injecting water into the container body with the opening closed by the top lid, and the discharge port is capable of discharging air from within the container body with the opening closed by the top lid and water being poured from the water injection pipe. The stirring means is capable of stirring the aggregate sample with the fine aggregate sample and water contained in the container body. The container body is formed of a material that allows the inside to be visually observed from the outside.

本願発明の吸水率試験方法は、吸水率試験装置を用いて細骨材試料の吸水率を求める試験方法であって、湿潤試料計量工程と満水装置計量工程、攪拌工程、充満装置計量工程、絶乾試料計量工程、表面水率算出工程、吸水率算出工程を備えた方法である。このうち湿潤試料計量工程では、「湿潤質量(細骨材試料の質量)」を計量し、満水装置計量工程では「満水装置質量(容器本体内を満水にした吸水率試験装置の質量)」を計量し、攪拌工程では、水とともに容器本体内に入れた細骨材試料を攪拌することによって細骨材試料内の空気を排出する。充満装置計量工程では、容器本体の底部に細骨材試料が沈降すると上蓋で開口部を閉じるとともに、排出口から容器本体内の空気を排出しながら、注水管によって容器本体内に注水し、さらに「充満装置質量(容器本体内が細骨材試料と水で充満した吸水率試験装置の質量)」を計量する。絶乾試料計量工程では、細骨材試料と水で充満した容器本体内から細骨材試料を取り出すとともに、絶対乾燥状態まで乾燥したうえで「絶乾質量(絶対乾燥状態とされた細骨材試料の質量)」を計量する。そして表面水率算出工程では、湿潤質量と満水装置質量、充満装置質量、細骨材試料の表乾密度に基づいて細骨材試料の表面水率を求め、吸水率算出工程では、湿潤質量と絶乾質量、表面水率に基づいて細骨材試料の吸水率を求める。 The water absorption test method of the present invention is a test method for determining the water absorption of a fine aggregate sample using a water absorption tester, and is a method including a wet sample weighing step, a water-filled apparatus weighing step, a stirring step, a filling apparatus weighing step, a bone-dry sample weighing step, a surface water ratio calculation step, and a water absorption calculation step. In the wet sample weighing step, the "wet mass (mass of the fine aggregate sample)" is measured, in the water-filled apparatus weighing step, the "water-filled apparatus mass (mass of the water absorption tester with the container body filled with water)" is measured, and in the stirring step, the fine aggregate sample placed in the container body together with water is stirred to expel air from within the fine aggregate sample. In the filling apparatus weighing step, when the fine aggregate sample settles to the bottom of the container body, the top lid is used to close the opening, and water is poured into the container body through the water injection tube while the air in the container body is expelled from the outlet, and the "filling apparatus mass (mass of the water absorption tester with the container body filled with fine aggregate sample and water)" is measured. In the bone dry sample weighing process, the fine aggregate sample is removed from the container body filled with fine aggregate sample and water, and after drying to an absolutely dry state, the "bone dry mass (mass of the fine aggregate sample brought to an absolutely dry state)" is measured. In the surface water ratio calculation process, the surface water ratio of the fine aggregate sample is calculated based on the wet mass, water-filled device mass, filled device mass, and surface dry density of the fine aggregate sample, and in the water absorption calculation process, the water absorption ratio of the fine aggregate sample is calculated based on the wet mass, bone dry mass, and surface water ratio.

本願発明の吸水率試験方法は、撹拌手段を有する吸水率試験装置を用いて細骨材試料の吸水率を求める方法とすることもできる。この場合、攪拌工程では、細骨材試料内に撹拌手段を配置するとともに、撹拌手段が自震することによって骨材試料を攪拌する。 The water absorption test method of the present invention can also be a method for determining the water absorption of a fine aggregate sample using a water absorption test device having a stirring means. In this case, in the stirring step, the stirring means is placed inside the fine aggregate sample, and the stirring means vibrates to stir the aggregate sample.

本願発明の吸水率試験方法は、表乾密度計測工程をさらに備えた方法とすることもできる。この表乾密度計測工程では、細骨材試料の表乾密度を計測する。 The water absorption test method of the present invention can also be a method further including a surface dry density measurement step. In this surface dry density measurement step, the surface dry density of the fine aggregate sample is measured.

本願発明の吸水率試験方法は、湿潤質量mと絶乾質量m、表面水率Hに基づく次式によって、細骨材試料の吸水率Qを求める方法とすることもできる。
Q={m-m×(1+H/100)}÷{m×(1+H/100)}×100
The water absorption test method of the present invention can also be a method for determining the water absorption Q of a fine aggregate sample using the following formula based on the wet mass mt , the bone dry mass m a and the surface water ratio H.
Q = { mt - ma x (1 + H/100)} ÷ { ma x (1 + H/100)} x 100

本願発明の吸水率試験方法は、湿潤質量mと満水装置質量M、充満装置質量M、細骨材試料の表乾密度をd、水の密度dに基づくに基づく次式によって、細骨材試料の表面水率Hを求める方法とすることもできる。
H={m×(1-d/d)-(M-M)}÷(M-M)×100
The water absorption test method of the present invention can also be a method of determining the surface water ratio H of a fine aggregate sample by the following formula based on the wet mass mt , the water-filling device mass M1 , the water-filling device mass M2 , the surface-dry density of the fine aggregate sample ds, and the water density dw .
H = { mt × (1 - dw / ds ) - ( M2 - M1 )} ÷ ( M2 - M1 ) × 100

本願発明の吸水率試験装置、及び吸水率試験方法には、次のような効果がある。
(1)「JIS A 1109」によって表面乾燥飽水状態を評価するケースでも、評価者の能力や熟練度等に左右されることなく、従来に比して高い精度で細骨材の吸水率を求めることができる。
(2)試験中、試料の状態が完全に維持できない状況でも、その状況を許容したうえで細骨材の吸水率を求めることができる。
(3)フローコーンを引き上げたときの細骨材の種類(川砂や山砂、砕砂)に伴う挙動の相違にも、柔軟に対応して細骨材の吸水率を求めることができる。
The water absorption test device and the water absorption test method of the present invention have the following effects.
(1) Even in cases where the surface dry/water-saturated state is evaluated according to "JIS A 1109," the water absorption rate of fine aggregate can be determined with higher accuracy than in the past, regardless of the ability or skill of the evaluator.
(2) Even if the condition of the sample cannot be perfectly maintained during the test, the water absorption rate of the fine aggregate can be determined by accepting this condition.
(3) The water absorption rate of fine aggregate can be calculated flexibly even when the behavior of the fine aggregate differs depending on the type of fine aggregate (river sand, mountain sand, crushed sand) when the flow cone is pulled up.

本願発明の吸水率試験装置を模式的に示す断面図。FIG. 2 is a cross-sectional view showing a schematic diagram of a water absorption test device according to the present invention. 本願発明の吸水率試験方法の主な工程を示すフロー図。1 is a flow chart showing main steps of the water absorption test method of the present invention. 本願発明の吸水率試験方法の主な工程を示すステップ図。FIG. 2 is a step diagram showing the main steps of the water absorption test method of the present invention. 正確な表乾質量(表中のNo11)との較差と、その較差によって生じた吸水率の誤差を示す対比図。1 is a comparison diagram showing the difference from the accurate table dry weight (No. 11 in the table) and the error in water absorption rate caused by that difference.

本願発明の吸水率試験装置、及び吸水率試験方法の実施の例を図に基づいて説明する。なお、本願発明の吸水率試験装置、及び吸水率試験方法は、コンクリートやモルタルの配合材料として用いられる細骨材が対象となる場合に特に好適に実施することができ、川砂や山砂、砕砂など細骨材として用いられる種々の材料を対象として実施することができる。 An example of the water absorption test device and water absorption test method of the present invention will be described with reference to the drawings. The water absorption test device and water absorption test method of the present invention are particularly suitable for use with fine aggregates used as mixing materials for concrete and mortar, and can be used with a variety of materials used as fine aggregates, such as river sand, mountain sand, and crushed sand.

1.全体概要
本願発明は、表乾質量mに基づいて吸水率Qを求める従来手法(式1)に代えて、表乾密度dに基づく表面水率によって吸水率Qを求めることを、技術的特徴の一つとしている。(式2)は試料とされた細骨材(以下、「細骨材試料」という。)の表面水率H(%)を求める数式であり、式中のmは細骨材試料の質量(以下、「湿潤質量」という。)、mは表乾質量である。

Figure 0007507049000002
1. Overall Overview One of the technical features of the present invention is to calculate the water absorption rate Q from the surface water ratio based on the surface dry density ds , instead of the conventional method (Formula 1) of calculating the water absorption rate Q based on the surface dry mass ms . (Formula 2) is a formula for calculating the surface water ratio H (%) of a sample of fine aggregate (hereinafter referred to as the "fine aggregate sample"), where mt is the mass of the fine aggregate sample (hereinafter referred to as the "wet mass") and ms is the surface dry mass.
Figure 0007507049000002

湿潤質量m(g)は、細骨材試料をそのまま計量すれば得られる。一方、表面水率Hは、質量法による表面水率試験方法や、容量法による表面水率試験方法によって得ることができる。例えば「JIS A 1111 細骨材の表面水率試験方法」では、容器内が満水とされた試験器の総重量(以下、便宜上「満水装置質量M」という。)と、容器内が細骨材試料と水で充満された試験器の総重量(以下、便宜上「充満装置質量M」という。)を計量し、これら満水装置質量M(g)と充満装置質量M(g)、さらに別途得られた湿潤質量mと表乾密度d(g/m)、水の密度d(g/m)を用いた次式によって表面水率Hを求めることとしている。

Figure 0007507049000003
The wet mass mt (g) can be obtained by weighing the fine aggregate sample as is. On the other hand, the surface water ratio H can be obtained by a surface water ratio test method using the mass method or the volumetric method. For example, in "JIS A 1111 Surface Water Ratio Test Method for Fine Aggregate", the total weight of the test vessel filled with water (hereinafter, for convenience, referred to as "water-filling vessel mass M1 ") and the total weight of the test vessel filled with fine aggregate sample and water (hereinafter, for convenience, referred to as "filling vessel mass M2 ") are measured, and the surface water ratio H is calculated by the following formula using the water-filling vessel mass M1 (g) and the filling vessel mass M2 (g), as well as the separately obtained wet mass mt , the surface dry density ds (g/ m3 ), and the density of water dw (g/ m3 ).
Figure 0007507049000003

(式3)によって表面水率Hを求めるには、細骨材試料の表乾密度dを把握する必要がある。表乾密度dは、表面乾燥飽水状態の細骨材試料の質量(表乾質量m)をその体積vで除した(式4)によって定義され、例えば「JIS A 1109」の試験方法によって求めることができる。具体的には、当該試験によって得られた表面乾燥飽水状態の細骨材試料の表乾質量mを計量するとともに、容器内が満水とされたピクノメータの全質量m(g)と、表面乾燥飽水状態の細骨材試料と水で満たしたピクノメータの全質量m(g)を計量し、水の密度dを用いた(式5)によって表乾密度dを求めるわけである。

Figure 0007507049000004
Figure 0007507049000005
To obtain the surface water ratio H by (Equation 3), it is necessary to know the surface dry density ds of the fine aggregate sample. The surface dry density ds is defined by (Equation 4) obtained by dividing the mass of the fine aggregate sample in a surface dry water-saturated state (surface dry mass ms ) by its volume vs , and can be obtained, for example, by the test method of "JIS A 1109". Specifically, the surface dry mass ms of the fine aggregate sample in a surface dry water-saturated state obtained by the test is measured, and the total mass mf (g) of the pycnometer with the container filled with water and the total mass mc (g) of the fine aggregate sample in a surface dry water -saturated state and the pycnometer filled with water are also measured, and the surface dry density ds is obtained by (Equation 5) using the density dw of water.
Figure 0007507049000004
Figure 0007507049000005

ところで、(式2)を変形すると表乾質量mを表す(式6)が得られる。そして、この表乾質量mを(式1)に代入すると(式7)が得られる。

Figure 0007507049000006
Figure 0007507049000007
By the way, by transforming (Equation 2), we obtain (Equation 6) which expresses the surface dry mass m s . Then, by substituting this surface dry mass m s into (Equation 1), we obtain (Equation 7).
Figure 0007507049000006
Figure 0007507049000007

吸水率Qを表す(式7)を見ると、いわば主観的に得られる表乾質量mを用いる必要がなく、客観的に求められる要素(パラメータ)によって算出することができることが分かる。(式7)中の湿潤質量mは細骨材試料をそのまま計量すれば得られ、絶乾質量mも規定どおりに絶対乾燥状態とした細骨材試料を計量することで得ることができる。また表面水率Hも「JIS A 1111」の試験方法によれば試験者の主観を伴うことなく得ることができる。なお、表面水率Hに用いられる表乾密度dを得るにあたっては、(式5)によって求める場合を含め、例えば「JIS A 1109」の試験方法によって細骨材試料の表面乾燥飽水状態を評価する必要がある。しかしながら表乾密度dは、既述したとおり表乾質量mの変化に対して感度が低い(つまり、表面乾燥飽水状態の評価のタイミングが多少ずれたとしても正しい値からそれほど誤差が生じない)。そのため本願発明によれば、従来に比して小さい誤差で表面水率Hや吸水率Qを求めることができるわけである。 When we look at (Equation 7) which expresses the water absorption rate Q, we can see that it is not necessary to use the surface dry mass m s which is obtained subjectively, but can be calculated using objectively obtained elements (parameters). The wet mass m t in (Equation 7) can be obtained by weighing the fine aggregate sample as it is, and the absolute dry mass m a can be obtained by weighing the fine aggregate sample which has been dried in an absolute dry state as specified. The surface water ratio H can also be obtained without the subjectivity of the tester according to the test method of "JIS A 1111". In addition, when obtaining the surface dry density d s used for the surface water ratio H, it is necessary to evaluate the surface dry water-saturated state of the fine aggregate sample, for example, according to the test method of "JIS A 1109", including the case where it is obtained by (Equation 5). However, as mentioned above, the surface dry density d s is not sensitive to changes in the surface dry mass m s (i.e., even if the timing of the evaluation of the surface dry water-saturated state is slightly shifted, there is not much error from the correct value). Therefore, according to the present invention, the surface water ratio H and the water absorption ratio Q can be calculated with smaller errors than in the past.

2.吸水率試験装置
次に、本願発明の吸水率試験装置について詳しく説明する。なお、本願発明の吸水率試験方法は、本願発明の吸水率試験装置を用いて細骨材試料の吸水率Qを求める方法である。したがって、まずは本願発明の吸水率試験装置について説明し、その後に本願発明の吸水率試験方法について説明することとする。
2. Water Absorption Testing Apparatus Next, the water absorption testing apparatus of the present invention will be described in detail. The water absorption testing method of the present invention is a method for determining the water absorption Q of a fine aggregate sample using the water absorption testing apparatus of the present invention. Therefore, the water absorption testing apparatus of the present invention will be described first, and then the water absorption testing method of the present invention will be described.

図1は、本願発明の吸水率試験装置100を模式的に示す断面図である。この図に示すように本願発明の吸水率試験装置100は、容器本体101と上蓋102、注水管103、排出口104を含んで構成され、さらに撹拌手段105を含んで構成することもできる。 Figure 1 is a cross-sectional view showing a schematic diagram of a water absorption tester 100 according to the present invention. As shown in this figure, the water absorption tester 100 according to the present invention includes a container body 101, a top cover 102, a water injection tube 103, and a discharge port 104, and can also include a stirring means 105.

容器本体101は、上部が開口した中空の筒状であり、内部に細骨材試料や水を収容することができる空間を有するものである。なお容器本体101の外形は、その水平断面が四角形である四角柱とすることができ、そのほか多角柱や円柱とすることもできる。なお、容器本体101を形成する側壁面は、外側から内側を目視することができる透明あるいは半透明の材料が使用される。例えば、ガラス板のほか、アクリル板やメタクリル板といった合成樹脂による板材を使用するとよい。 The container body 101 is a hollow cylinder with an open top, and has a space inside that can hold fine aggregate samples and water. The outer shape of the container body 101 can be a quadrangular prism with a square horizontal cross section, or it can be a polygonal prism or a cylinder. The side wall surfaces that form the container body 101 are made of a transparent or semi-transparent material that allows the inside to be seen from the outside. For example, it is recommended to use a glass plate or a plate material made of synthetic resin such as an acrylic plate or a methacrylic plate.

上蓋102は、容器本体101の開口部を開閉することができるものである。例えば、上蓋102を着脱可能とすることによって開口部を開閉可能にすることもできるし、上蓋102の一部をヒンジ固定(例えば、蝶番を利用した固定)とすることによって開口部を開閉可能にすることもできる。なお、上蓋102によって容器本体101の開口部を閉鎖するときは、容器本体101内の気体(空気)が外部に漏出しない、いわゆる気密状態になる構造にするとよい。 The top lid 102 is capable of opening and closing the opening of the container body 101. For example, the opening can be opened and closed by making the top lid 102 detachable, or the opening can be opened and closed by fixing a part of the top lid 102 to a hinge (for example, fixing using a hinge). When closing the opening of the container body 101 with the top lid 102, it is preferable to use a structure that creates a so-called airtight state in which gas (air) inside the container body 101 does not leak to the outside.

注水管103は、容器本体101内に注水できる管体(パイプ)であり、上蓋102を貫通するように設置することができる。なお注水管103は、その注水口(図では下側の口)側の一部が略水平(水平含む)となるように折り曲げたいわゆるL字形にするとよい。これにより、注水口から排出される水によって容器本体101内の細骨材試料が乱されることを緩和できる。 The water injection tube 103 is a tube (pipe) that can inject water into the container body 101, and can be installed so as to penetrate the top lid 102. The water injection tube 103 should preferably be bent so that a portion of its water injection port (the lower port in the figure) is approximately horizontal (including horizontal) in a so-called L-shape. This can reduce the disturbance of the fine aggregate sample in the container body 101 by the water discharged from the water injection port.

排出口104は、容器本体101内の空気を排出する機能を有するもので、図に示すように管体(パイプ)として上蓋102を貫通するように設置することもできるし、単に上蓋102に開口部(小孔)を設けることによって形成することもできる。容器本体101の開口部を上蓋102で閉じた状態で、注水管103によって容器本体101内に注水したとき、排出口104を設けた効果で容器本体101内の空気が排出されるわけである。換言すれば、容器本体101の開口部を上蓋102で閉じた状態で、容器本体101内の空気を排出口104から排出しながら、注水管103によって容器本体101内に注水することができる。なお、注水管103や排出口104は、外部との水や空気の流通を遮断することができる封鎖栓(キャップなど)を設けることもできる。 The outlet 104 has the function of discharging air from within the container body 101, and can be installed as a tube (pipe) penetrating the top lid 102 as shown in the figure, or can be formed by simply providing an opening (small hole) in the top lid 102. When the opening of the container body 101 is closed with the top lid 102 and water is poured into the container body 101 by the water injection tube 103, the air in the container body 101 is discharged due to the effect of providing the outlet 104. In other words, with the opening of the container body 101 closed with the top lid 102, water can be poured into the container body 101 by the water injection tube 103 while the air in the container body 101 is discharged from the outlet 104. The water injection tube 103 and the outlet 104 can also be provided with a sealing plug (such as a cap) that can block the flow of water and air to the outside.

撹拌手段105は、水とともに容器本体101内に入れた細骨材試料を攪拌することができる機能を有するものである。例えば、コンクリート締固め用のバイブレータなど棒状の振動機や、容器本体101を載せた状態で振動を与える振動台、あるいはマグネチックスターラーなど細骨材試料内で自震する装置(以下、「自震装置」という。)などを、撹拌手段105として利用することができる。 The stirring means 105 has a function of stirring the fine aggregate sample placed in the container body 101 together with water. For example, a rod-shaped vibrator such as a vibrator for compacting concrete, a vibration table that applies vibrations while the container body 101 is placed on it, or a device that vibrates itself within the fine aggregate sample, such as a magnetic stirrer (hereinafter referred to as a "self-vibrating device"), can be used as the stirring means 105.

3.吸水率試験方法
続いて本願発明の吸水率試験方法について図2と図3を参照しながら説明する。なお、本願発明の吸水率試験方法は、ここまで説明した本願発明の吸水率試験装置100を用いて細骨材試料の吸水率Qを求める方法である。したがって吸水率試験装置100で説明した内容と重複する説明は避け、本願発明の吸水率試験方法に特有の内容のみ説明することとする。すなわち、ここに記載されていない内容は、「2.吸水率試験装置」で説明したものと同様である。
3. Water Absorption Test Method Next, the water absorption test method of the present invention will be described with reference to Figures 2 and 3. The water absorption test method of the present invention is a method for determining the water absorption Q of a fine aggregate sample using the water absorption test apparatus 100 of the present invention described up to this point. Therefore, we will avoid any explanation that overlaps with the contents explained in the water absorption test apparatus 100, and will only explain the contents unique to the water absorption test method of the present invention. In other words, the contents not described here are the same as those explained in "2. Water Absorption Test Apparatus".

図2は、本願発明の吸水率試験方法の主な工程を示すフロー図であり、図3は、本願発明の吸水率試験方法の主な工程を示すステップ図である。まず、図3(a)に示すように例えばバットに載せた細骨材試料の湿潤質量mを計量する(図2のStep201)。このとき、特段の吸水や乾燥を行うことなく、その状態のままの細骨材試料の質量を計量する。また、図3(b)に示すように容器本体101内を満水とし、その状態における吸水率試験装置100の質量(満水装置質量M)を計量する(図2のStep202)。このとき、容器本体101のほか、上蓋102と注水管103、排出口104も合わせて計量し、容器本体101が撹拌手段105を含む場合(特に自震装置を利用する場合)は撹拌手段105も合わせて計量する。 FIG. 2 is a flow chart showing the main steps of the water absorption test method of the present invention, and FIG. 3 is a step chart showing the main steps of the water absorption test method of the present invention. First, as shown in FIG. 3(a), for example, the wet mass m t of a fine aggregate sample placed on a tray is measured (Step 201 in FIG. 2). At this time, the mass of the fine aggregate sample in its current state is measured without any particular water absorption or drying. In addition, as shown in FIG. 3(b), the container body 101 is filled with water, and the mass of the water absorption test device 100 in this state (water-filled device mass M 1 ) is measured (Step 202 in FIG. 2). At this time, in addition to the container body 101, the top cover 102, the water injection tube 103, and the discharge port 104 are also measured, and when the container body 101 includes the stirring means 105 (especially when a self-exciting device is used), the stirring means 105 is also measured.

吸水率試験装置100の満水装置質量Mが得られると、図3(c)に示すように容器本体101の開口部を開放し、一旦空にした容器本体101内に細骨材試料と水を入れる。このとき、容器本体101内を満水にする必要はない。そして、水とともに容器本体101内に入れた細骨材試料を攪拌手段105によって攪拌し、細骨材試料内の空気を排出する(図2のStep203)。例えば、攪拌手段105としてマグネチックスターラーといった自震装置を利用する場合、細骨材試料内に自震装置を配置したうえでこれを自震させる。細骨材試料内の空気が十分排出されると、図3(d)に示すように細骨材試は容器本体101の底部に沈降していく。 When the water-filled device mass M1 of the water absorption test device 100 is obtained, the opening of the container body 101 is opened as shown in FIG. 3(c), and the fine aggregate sample and water are placed in the container body 101 that has been emptied. At this time, it is not necessary to fill the container body 101 with water. Then, the fine aggregate sample placed in the container body 101 together with the water is stirred by the stirring means 105, and the air in the fine aggregate sample is discharged (Step 203 in FIG. 2). For example, when a self-vibrating device such as a magnetic stirrer is used as the stirring means 105, the self-vibrating device is placed in the fine aggregate sample and then allowed to vibrate. When the air in the fine aggregate sample is sufficiently discharged, the fine aggregate sample sinks to the bottom of the container body 101 as shown in FIG. 3(d).

細骨材試が容器本体101の底部に沈降すると、図3(e)に示すように上蓋102によって容器本体101の開口部を閉鎖し、その状態のまま容器本体101内の空気を排出口104から排出しながら、容器本体101が満水になるまで注水管103によって注水していく(図2のStep204)。容器本体101が満水になると、その状態における吸水率試験装置100の質量(充満装置質量M)を計量する(図2のStep205)。このとき、容器本体101のほか、上蓋102と注水管103、排出口104も合わせて計量し、容器本体101が撹拌手段105を含む場合は撹拌手段105も合わせて計量する。 When the fine aggregate sample sinks to the bottom of the container body 101, the opening of the container body 101 is closed by the top lid 102 as shown in Fig. 3(e), and while the air in the container body 101 is discharged from the outlet 104 in this state, water is poured in through the water injection tube 103 until the container body 101 is full of water (Step 204 in Fig. 2). When the container body 101 is full of water, the mass of the water absorption test apparatus 100 in this state (the mass M2 of the water-filling apparatus) is measured (Step 205 in Fig. 2). At this time, in addition to the container body 101, the top lid 102, the water injection tube 103, and the outlet 104 are also measured, and if the container body 101 includes the stirring means 105, the stirring means 105 is also measured.

吸水率試験装置100の充満装置質量Mが得られると、細骨材試料と水で充満した容器本体101から細骨材試料を取り出し、細骨材試料が絶対乾燥状態となるまで(100~110℃の温度で定質量となるまで)乾燥し(図2のStep206)、図3(f)に示すように例えばバットに載せた絶対乾燥状態の骨材試料の質量(絶乾質量m)を計量する(図2のStep207)。 When the filled device mass M2 of the water absorption test device 100 is obtained, the fine aggregate sample is removed from the container body 101 filled with the fine aggregate sample and water, and dried until the fine aggregate sample becomes absolutely dry (until a constant mass is reached at a temperature of 100 to 110°C) (Step 206 in Figure 2), and the mass of the aggregate sample in an absolutely dry state (absolute dry mass m a ) placed on, for example, a tray as shown in Figure 3(f) is measured (Step 207 in Figure 2).

一方、表面乾燥飽水状態とされた細骨材試料の密度(表乾密度d)をあらかじめ把握しておく(図2のStep208)。細骨材試料の表乾密度dは、例えば「JIS A 1109」の試験方法によって求めることができる。具体的には、まず当該試験によって細骨材試料を表面乾燥飽水状態とし、その表乾質量mを計量するとともに、容器内が満水とされたピクノメータの全質量m、表面乾燥飽水状態の細骨材試料と水で満たしたピクノメータの全質量mを計量する。そして、水の密度dを用いた(式5)によって表乾密度dを求める。あるいは、表面乾燥飽水状態とされた細骨材試料の体積vとその質量(表乾質量m)が得られている場合は、(式4)によっていわば直接的に表乾密度dを求めることもできる。なお、既に細骨材試料の表乾密度dを把握してる場合は、これを求めるための試験等(図2のStep208)を省略することができる。 On the other hand, the density of the fine aggregate sample in a surface dry water-saturated state (surface dry density ds ) is obtained in advance (Step 208 in Fig. 2). The surface dry density ds of the fine aggregate sample can be obtained, for example, by the test method of "JIS A 1109". Specifically, the fine aggregate sample is first brought to a surface dry water-saturated state by the test, and its surface dry mass ms is measured. In addition, the total mass mf of the pycnometer with the container filled with water, and the total mass mc of the fine aggregate sample in a surface dry water-saturated state and the pycnometer filled with water are measured. Then, the surface dry density ds is obtained by (Equation 5) using the density dw of water. Alternatively, when the volume vs of the fine aggregate sample in a surface dry water-saturated state and its mass (surface dry mass ms ) are obtained, the surface dry density ds can be obtained directly by (Equation 4). In addition, if the surface dry density ds of the fine aggregate sample is already known, the test for determining it (Step 208 in FIG. 2) can be omitted.

表面水率Hが、細骨材試料の湿潤質量mと表乾密度d、吸水率試験装置100の満水装置質量Mと充満装置質量Mが得られると、細骨材試料の表面水率Hを求める(図2のStep209)。このとき、(式3)によって細骨材試料の表面水率Hを求めることができる。そして、細骨材試料の湿潤質量mと絶乾質量m、表面水率Hが得られると、細骨材試料の吸水率Qを求める(図2のStep210)。このとき、(式3)によって細骨材試料の吸水率Qを求めることができる。 When the wet mass mt , surface dry density ds of the fine aggregate sample, and the water-filled device mass M1 and the filled device mass M2 of the water absorption test device 100 are obtained, the surface water rate H of the fine aggregate sample is calculated (Step 209 in FIG. 2). At this time, the surface water rate H of the fine aggregate sample can be calculated using (Equation 3). Then, when the wet mass mt, bone dry mass m a , and surface water rate H of the fine aggregate sample are obtained, the water absorption rate Q of the fine aggregate sample is calculated (Step 210 in FIG. 2). At this time, the water absorption rate Q of the fine aggregate sample can be calculated using (Equation 3).

本願発明の吸水率試験装置、及び吸水率試験方法は、橋梁の上部工・下部工や、擁壁、カルバート、ダム、トンネル覆工コンクリートといった土木構造物、あるいは集合住宅やオフィスビルといった建築構造物、その他種々のコンクリート構造物に利用することができる。本願発明が、適切な品質の細骨材が配合された、いわば高品質のコンクリート構造物を提供することを考えれば、産業上利用できるばかりでなく社会的にも大きな貢献を期待し得る発明といえる。 The water absorption test device and water absorption test method of the present invention can be used for civil engineering structures such as bridge superstructures and substructures, retaining walls, culverts, dams, and tunnel lining concrete, as well as architectural structures such as apartment buildings and office buildings, and various other concrete structures. Given that the present invention provides high-quality concrete structures that contain fine aggregate of appropriate quality, it can be said to be an invention that can be expected to not only be used industrially but also to make a significant contribution to society.

100 本願発明の吸水率試験装置
101 (吸水率試験装置の)容器本体
102 (吸水率試験装置の)上蓋
103 (吸水率試験装置の)注水管
104 (吸水率試験装置の)排出口
105 (吸水率試験装置の)撹拌手段
(試料の)表乾密度
水の密度
H (試料の)表面水率
(試料の)絶乾質量
(試料の)表乾質量
(試料の)湿潤質量
(吸水率試験装置の)満水装置質量
(吸水率試験装置の)充満装置質量
Q (試料の)吸水率
100 Water absorption test apparatus of the present invention 101 Container body (of water absorption test apparatus) 102 Top lid (of water absorption test apparatus) 103 Water inlet pipe (of water absorption test apparatus) 104 Outlet (of water absorption test apparatus) 105 Stirring means (of water absorption test apparatus) d s Surface dry density (of sample) d w Water density H Surface water ratio (of sample) m a Bone dry mass (of sample) m s Surface dry mass (of sample) m t Wet mass (of sample) M 1 Water-filled apparatus mass (of water absorption test apparatus) M 2 Filled apparatus mass (of water absorption test apparatus) Q Water absorption (of sample)

Claims (4)

吸水率試験装置を用いて、細骨材試料の吸水率を求める試験方法であって、
前記吸水率試験装置は、上部に開口部を有する容器本体と、該開口部を開閉可能な上蓋と、該容器本体内に注水し得る注水管と、該容器本体内の空気を排出し得る排出口と、を有し、
前記細骨材試料の質量である湿潤質量m を、計量する湿潤試料計量工程と、
前記容器本体内を満水にした前記吸水率試験装置の質量である満水装置質量M を、計量する満水装置計量工程と、
前記容器本体内に前記細骨材試料と水を入れ、該細骨材試料を攪拌することによって該細骨材試料内の空気を排出する攪拌工程と、
前記攪拌工程によって前記容器本体の底部に前記細骨材試料が沈降すると、前記上蓋で前記開口部を閉じるとともに、前記排出口から該容器本体内の空気を排出しながら、前記注水管によって該容器本体内に注水し、該容器本体内が該細骨材試料と水で充満した前記吸水率試験装置の質量である充満装置質量M を、計量する充満装置計量工程と、
前記細骨材試料と水で充満した前記容器本体内から該細骨材試料を取り出すとともに乾燥し、絶対乾燥状態とされた該細骨材試料の質量である絶乾質量m を、計量する絶乾試料計量工程と、
前記細骨材試料の表乾密度d を計測する表乾密度計測工程と、
前記湿潤試料計量工程で得られた前記湿潤質量m と、前記満水装置計量工程で得られた前記満水装置質量M と、前記充満装置計量工程で得られた前記充満装置質量M と、前記充満装置計量工程で得られた前記表乾密度d と、に基づいて該細骨材試料の表面水率Hを求める表面水率算出工程と、
前記湿潤試料計量工程で得られた前記湿潤質量m と、前記絶乾試料計量工程で得られた前記絶乾質量m と、前記表面水率算出工程で得られた前記表面水率Hと、に基づいて前記細骨材試料の吸水率Qを求める吸水率算出工程と、を備えた、
ことを特徴とする吸水率試験方法。
A test method for determining the water absorption rate of a fine aggregate sample using a water absorption test device, comprising:
The water absorption tester includes a container body having an opening at an upper portion, a top cover capable of opening and closing the opening, a water injection tube capable of injecting water into the container body, and an outlet port capable of discharging air from within the container body.
A wet sample measuring step of measuring a wet mass m t of the fine aggregate sample;
a water-filling apparatus weighing step of measuring a water-filling apparatus mass M1 , which is the mass of the water absorption test apparatus with the container body filled with water;
a stirring step of placing the fine aggregate sample and water in the container body and stirring the fine aggregate sample to expel air from within the fine aggregate sample;
a filling device measuring step of filling the container body with water using the water injection tube while closing the opening with the top lid when the fine aggregate sample settles to the bottom of the container body by the stirring step and discharging the air in the container body from the outlet, and measuring a filling device mass M2 , which is the mass of the water absorption test device in which the container body is filled with the fine aggregate sample and water;
a measuring step of measuring an absolute dry mass m a of the fine aggregate sample by removing the fine aggregate sample from the container body filled with the fine aggregate sample and water and drying the fine aggregate sample to obtain an absolute dry mass m a of the fine aggregate sample;
a surface dry density measuring step of measuring a surface dry density d s of the fine aggregate sample ;
a surface water ratio calculation step of calculating a surface water ratio H of the fine aggregate sample based on the wet mass mt obtained in the wet sample weighing step, the water- filling device mass M1 obtained in the water- filling device weighing step, the water-filling device mass M2 obtained in the water-filling device weighing step , and the surface dry density ds obtained in the water-filling device weighing step;
and a water absorption rate calculation step of calculating the water absorption rate Q of the fine aggregate sample based on the wet mass mt obtained in the wet sample weighing step, the bone dry mass m a obtained in the bone dry sample weighing step, and the surface water rate H obtained in the surface water rate calculation step.
A method for testing water absorption.
前記吸水率試験装置は、自震することによって前記細骨材試料を攪拌し得る撹拌手段を有し、
前記攪拌工程では、前記細骨材試料内に前記撹拌手段を配置するとともに、該撹拌手段によって該細骨材試料を攪拌する、
ことを特徴とする請求項1記載の吸水率試験方法。
The water absorption test apparatus has an agitation means capable of agitating the fine aggregate sample by vibrating the apparatus itself,
In the stirring step, the stirring means is disposed within the fine aggregate sample, and the fine aggregate sample is stirred by the stirring means.
2. The method for testing water absorption according to claim 1 .
前記細骨材試料の前記吸水率Qが、前記湿潤質量m、前記絶乾質量m、前記表面水率Hに基づく次式によって求められる、
Q={m-m×(1+H/100)}÷{m×(1+H/100)}×100
ことを特徴とする請求項1又は請求項2記載の吸水率試験方法。
The water absorption rate Q of the fine aggregate sample is calculated based on the wet mass mt , the bone dry mass m a , and the surface water rate H according to the following formula:
Q = { mt - ma x (1 + H/100)} ÷ { ma x (1 + H/100)} x 100
3. The method for testing water absorption according to claim 1 or 2 .
前記細骨材試料の前記表面水率Hが、前記湿潤質量m 、前記満水装置質量M、前記充満装置質量M前記表乾密度d 、水の密度dに基づく次式によって求められる、
H={m×(1-d/d)-(M-M)}÷(M-M)×100
ことを特徴とする請求項1乃至請求項3のいずれかに記載の吸水率試験方法。
The surface water ratio H of the fine aggregate sample is calculated based on the wet mass mt , the water-filling device mass M1 , the water-filling device mass M2 , the surface-dry density ds , and the water density dw by the following formula:
H = { mt × (1 - dw / ds ) - ( M2 - M1 )} ÷ ( M2 - M1 ) × 100
4. The method for testing water absorption according to claim 1 .
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001215184A (en) 2000-02-01 2001-08-10 Vector Chuo Kenkyusho:Kk Method for measuring water absorption, specific gravity in saturated surface-dry condition and surface moisture ratio of aggregate, determination container used therein and water adding device
JP2001289766A (en) 2000-01-31 2001-10-19 Haiko Onoda Remicon Kk Percentage of aggregate water absorption measuring method, aggregate surface moisture ratio measuring method, surface moisture removing device, and mortar constituent extracting apparatus
JP2002131208A (en) 2000-10-25 2002-05-09 Vector Chuo Kenkyusho:Kk Method for measuring density in saturated surface-dry condition, rate of water absorption, surface moisture ratio of aggregate and high-temperature aggregate cooling device used for the same
US20030030450A1 (en) 2001-08-07 2003-02-13 Devine Patrick C. Test method and apparatus for determining the surface saturated dry condition of aggregates
JP2009113408A (en) 2007-11-08 2009-05-28 Okumura Corp Specification value computing method for fine aggregate

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001289766A (en) 2000-01-31 2001-10-19 Haiko Onoda Remicon Kk Percentage of aggregate water absorption measuring method, aggregate surface moisture ratio measuring method, surface moisture removing device, and mortar constituent extracting apparatus
JP2001215184A (en) 2000-02-01 2001-08-10 Vector Chuo Kenkyusho:Kk Method for measuring water absorption, specific gravity in saturated surface-dry condition and surface moisture ratio of aggregate, determination container used therein and water adding device
JP2002131208A (en) 2000-10-25 2002-05-09 Vector Chuo Kenkyusho:Kk Method for measuring density in saturated surface-dry condition, rate of water absorption, surface moisture ratio of aggregate and high-temperature aggregate cooling device used for the same
US20030030450A1 (en) 2001-08-07 2003-02-13 Devine Patrick C. Test method and apparatus for determining the surface saturated dry condition of aggregates
JP2009113408A (en) 2007-11-08 2009-05-28 Okumura Corp Specification value computing method for fine aggregate

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