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CN102241497A - Concrete with ultra-large volume, high strength and low hydration heat - Google Patents

Concrete with ultra-large volume, high strength and low hydration heat Download PDF

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CN102241497A
CN102241497A CN2011101458329A CN201110145832A CN102241497A CN 102241497 A CN102241497 A CN 102241497A CN 2011101458329 A CN2011101458329 A CN 2011101458329A CN 201110145832 A CN201110145832 A CN 201110145832A CN 102241497 A CN102241497 A CN 102241497A
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concrete
hydration heat
ultra
large volume
high strength
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CN102241497B (en
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吴德龙
陈建大
龚剑
陈康
陈尧亮
黄玉林
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SHANGHAI FUKANG CONSTRUCTION CO Ltd
Shanghai Pulian Premixed Concrete Co ltd
SHANGHAI PUSHENG CONCRETE CO Ltd
SHANGHAI PUXIN YUBAN CONCRETE CO Ltd
Shanghai Construction No 1 Group Co Ltd
Shanghai Construction Building Materials Technology Group Co Ltd
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Shanghai First Construction Co Ltd
SHANGHAI FUKANG CONSTRUCTION CO Ltd
Shanghai Pulian Ready Mixed Concrete Co Ltd
SHANGHAI PUSHENG CONCRETE CO Ltd
SHANGHAI PUXIN YUBAN CONCRETE CO Ltd
Shanghai Jiangong Construction Material Co Ltd
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Abstract

The invention relates to concrete with ultra-large volume, high strength and low hydration heat. The concrete comprises the following components in parts by weight: 200-260 parts of cement, 100-160 parts of mineral powder, 80-100 parts of fly ash, 740-800 parts of fine aggregate, 1010-1050 parts of coarse aggregate, 4.0-5.0 parts of additive and 155-165 parts of water. The concrete with ultra-large volume, high strength and low hydration heat can be used to effectively reduce the hydration heat, greatly reduce the cracking risk of the large-volume concrete from the source and increase the engineering quality.

Description

A kind of ultra-large volume high strength low hydration heat concrete
Technical field
The present invention relates to material of construction, specially refer to a kind of ultra-large volume high strength low hydration heat concrete.
Background technology
Mass concrete is applied to water works the earliest, and uses comparatively general.And in recent years, along with the development of social economy and Building technology, construction scope constantly enlarges, and Highrise buildings and high-rise building are also more and more, and mass concrete becomes the important component part that makes up main facilities or high-rise building gradually.Mass concrete cracking phenomena occurs in structures such as the high level that is widely used in field of civil engineering and high-rise building, long-span bridge girder construction and Industrial buildings the time in than multiple-project.Cause mass concrete rimose reason can be divided into two classes: the one, structural crack is caused by external load, comprises main stress and other the structure secondary stress stressed crack of causing of conventional structure in calculating.The 2nd, the material-type crack is caused by the external force deformation variation by non-, mainly caused by thermal stress and concrete contraction.Thermal stress causes crack (thermal cracking), and the major cause that produces thermal cracking is caused by the temperature difference.Mass concrete is in pouring construction and later stage maintenance processes, because it is hydration heat that the hydration reaction of gelling material such as cement is emitted a large amount of heats, and the concrete scale of construction is big, thickness is thick, and concrete itself is the poor conductor of heat, hydration heat accumulates in inside concrete and is difficult for distributing, internal temperature up to 60 ℃~90 ℃.But concrete is in temperature-fall period, the outside cold concrete contraction of internal heat concrete constraint, be that the internal temperature field exists thermograde, formation temperature stress, cause internal stress, at the position that is tied, concrete contraction, with producing very big tensile stress (because concrete Young's modulus, the cause that strengthens with the increase in the length of time), if surpass concrete ultimate tensile strength, distress in concrete will appear, cause the concrete physical and mechanical property to reduce, etching medium easily is penetrated into concrete structure inside, thereby reduces concrete life.
It is the large cylinder that 121m, thickness reach 6m that the sole plate of center, Shanghai mansion engineering is designed to a diameter, and strength grade of concrete is C50.These sole plate 60,000 side C50 concrete need disposable continuous casting pound to finish.High, the disposable side of this ultra-large volume concrete strength grade measures the thick of big and thickness, these complex art conditions are had no precedent in the prior art, so that, reducing the risk of concrete cracking and having higher requirement how controlling the ultra-large volume concrete hydration heat.
Summary of the invention
The objective of the invention is to overcome the deficiency that existing concrete exists in the big scale of construction is built, a kind of ultra-large volume high strength low hydration heat concrete is provided.It is 121m that ultra-large volume high strength low hydration heat concrete of the present invention is applied in diameter, thickness is that the scale of construction of 6m reaches in 60000 sides' the cylinder-like structure, when building, requirement effectively reduces hydration heat, this mass concrete cracking of control on the source, the quality of raising engineering.
In order to reach the foregoing invention purpose, technical scheme provided by the invention is as follows:
A kind of ultra-large volume high strength low hydration heat concrete is characterized in that this concrete includes following composition:
Component cube consumption kg/m 3
Cement 200~260
Breeze 100~160
Flyash 80~100
Fine aggregate 740~800
Coarse aggregate 1010~1050
Admixture 4.0~5.0
Water 155~165.
In concrete of the present invention, described cement is middle low heat cement, and its 3d hydration heat is 220KJ/Kg, and the 7d hydration heat is 289 KJ/Kg.
In concrete of the present invention, described fine aggregate adopt fineness modulus greater than 2.3, silt content less than 2.0%, clod content is less than 0.5% natural medium sand.
In concrete of the present invention, it is the rubble of 5~25mm that described coarse aggregate adopts particle diameter.
In concrete of the present invention, described admixture is the poly carboxylic acid series water reducer of modification, and poly carboxylic acid series water reducer is produced by Mace is special, and model is RP325.Be added with viscosity modifier in the poly carboxylic acid series water reducer, the mass percent of its volume is 0.1%~0.3%, by the susceptibility of viscosity modifier modified polycarboxylic acid high efficiency water reducing agent to the susceptibility of water and the fluctuation of other raw material quality.
In concrete of the present invention, in the described cement in blended material consumption and the concrete adulterant consumption sum be not less than 65% of binder total amount.The slag of mixing in blended material in the cement is meant, flyash, the adulterant in the concrete are outer breeze, the flyash of mixing, and total glue is meant the total amount of gelling material.
Based on technique scheme, ultra-large volume high strength low hydration heat concrete of the present invention compared with prior art has following technological merit:
1. pass through the kind and the volume of proportioning cement, mineral admixture in the concrete of the present invention, and in conjunction with the factor of admixture, reduce hydration heat in the concrete by Synthesis, guarantee that the super thick concrete pouring quality of ultra-large volume satisfies the requirement of aspects such as design, construction and supply.
2. the present invention selects mineral admixture and interpolation poly carboxylic acid series water reducers such as middle low heat cement, big volume breeze and flyash for use, can reduce concrete hydration heat and rate of heat release effectively, help the raising of the early stage performance of concrete, improved concrete opposing rimose ability, reduce the risk that concrete produces defective in early days, this point is fairly obvious for the concrete effect of building of the big scale of construction of the super thickness of ultra-large volume.
Embodiment
Below we come in conjunction with specific embodiments ultra-large volume high strength low hydration heat concrete of the present invention done further and elaborate; make every effort to come more clearly to understand the present invention, but can not limit protection scope of the present invention with this from Design Theory and application in practice aspect.
The fissured control of ultra-large volume concrete is a systematic engineering.The gelling material selection of mass concrete and all links such as preparation, concrete production and pouring construction and maintenance all will have influence on the quality quality degree of final concrete works.Yet the hydration heat of gelling material is the main reference parameter that carries out the temperature cracks control of mass concrete design, also is control ultra-large volume concrete rimose source.Through a large amount of lab scale, pilot scale repeatedly and tests such as simulation test, and to hydration heat, the resistance to compression of ultra-large volume C50 concrete mix, split draw, anti-folding and play performance such as mould and thermometric is furtherd investigate, just determined the ultimate constituent proportioning of the super thick high-strength concrete of ultra-large volume:
Component cube consumption kg/m 3
Cement 200~260
Breeze 100~160
Flyash 80~100
Fine aggregate 740~800
Coarse aggregate 1010~1050
Admixture 4.0~5.0
Water 155~165.
Following table is a concrete C50 mix Design (units/m 3)
Figure 2011101458329100002DEST_PATH_IMAGE002
Remarks: slump 180mm ± 30mm;
Cement is topmost material in the concrete gelling system, and is one of main factor that influences temperature rise in the concrete.Because concrete thermal conductivity is low, liberated heat is difficult for scattering and disappearing during hydrated cementitious, and the inside concrete top temperature is reached more than 60 ℃.Because the cooling of concrete outside surface is very fast, just makes temperature difference between inside and outside concrete reach tens degree.The concrete exterior cooling produces shrinks, and inside is still uncolled, just produces internal stress, is easy to generate microfracture, causes the concrete water tolerance to reduce.Adopt the cement that hangs down thermal discharge and low rate of heat release just can reduce the internal temperature rise of mass concrete.Therefore, mainly be to adopt high-performance cement, the hydration heat and the rate of heat release that reduce cement are extremely important.Selecting strength grade for use is 42.5 grades of ordinary Portland cements, and technical indicator meets existing standard GB 175-2007 " general purpose portland cement ".What select in the embodiments of the invention is middle low heat cement, because the hydration heat of this cement 3d is being lower than moderate heat cement, the hydration heat of 7d is between moderate heat cement and low heat cement.And the hydration heat speed of this cement and the change curve of hydration heat thermal discharge and hydration time also are the actual requirements of comparatively compound our engineering, both satisfied the hydration heat requirement of engineering, hydration heat is not again the characteristic that satisfies the C50 high strength requirement of engineering too slowly simultaneously.The hydration heat rate of heat release of the middle low heat cement that adopts in the embodiment of the invention and heat are along with hydration time becomes certain curvilinear motion, and early stage heat release is very fast, and the hydration heat speed of cement reaches maximum about 12 hours, and rate of heat release reduces gradually afterwards.
Active mineral admixture is one of indispensable component of mass concrete, and general commonly used have flyash, a breeze etc.Utilize their physical influence, filling effect and volcanic ash effect, not only can reduce the inside yield shear stress of newly mixing self-compacting concrete significantly, improve rheological property, the pore structure and the mechanical property of self-compacting concrete structure can be improved, hydration heat can also be reduced greatly simultaneously.
Mineral admixture such as flyash and breeze is incorporated in the C50 gelling system, can significantly reduce hydration heat of concrete, and 3d hydration heat and 7d hydration heat have reduced by 22.3% and 13.5% respectively than reference cement.Simultaneously, the hydration heat rate of heat release is also slow than reference cement, and the peakedness ratio reference cement of the gelling system hydration heat speed of being made up of cement, breeze and flyash is postponed appearance in about 12 hours.Because the early age strength of concrete performance is relatively weaker, postponing of hydration heat peak value helps concrete and develops intensity as soon as possible, so that resist the cracking risk that the caused thermal stress of latter temperature stress is caused.In the concrete of the present invention, in the cement in blended material consumption and the concrete adulterant consumption sum be not less than 65% of total glue.The slag of mixing in blended material in the cement is meant, flyash, the adulterant in the concrete are outer breeze, the flyash of mixing, and total glue is meant the total amount of gelling material.
The high-performance poly carboxylic acid water reducing agent is one of concrete requisite component of preparation large volume C50 as topmost admixture.The high-performance poly carboxylic acid water reducing agent not only can reduce water consumption, reduce total glue consumption of concrete mix, simultaneously under the constant situation of water cement ratio, can reduce single cement consumption, so can reduce concrete absolute temperature rise, reduce concrete chemical shrinkage.Test-results according to W.H.dilger and C.Wang: high efficiency water reducing agent is postponed the time opening of hydrated cementitious, but the hydration rate after condensing is accelerated, but the hydration heat speed than reference cement is a lot of slowly generally.Admixture is the poly carboxylic acid series water reducer of modification in concrete of the present invention, and poly carboxylic acid series water reducer is produced by Mace is special, and model is RP325.Be added with viscosity modifier in the poly carboxylic acid series water reducer, the mass percent of its volume is 0.1%~0.3%, by the susceptibility of viscosity modifier modified polycarboxylic acid high efficiency water reducing agent to the susceptibility of water and the fluctuation of other raw material quality.
The gelling system of mixing a certain amount of admixture carries out hydration heat and detects, and also can change concrete whole hydration heat really, and not only hydration heat speed significantly reduces, and the hydration heat exothermic peak was postponed about 20 hours.According to test, 3d and 7d hydration heat have reduced by 37.3% and 24.6% than reference cement respectively, and the reduction amplitude is bigger, and the hydration heat than the cementitious material system of not mixing admixture has reduced by 19.3% and 12.8% simultaneously.These all are very beneficial for our control to the early stage quality of concrete.
By mineral admixture and interpolation high-performance poly carboxylic acid water reducing agents such as the middle low heat cement of selecting excellent performance, big volume breeze and flyash, can effectively reduce concrete hydration heat and rate of heat release, reduce the development of performances such as early age strength of concrete, help the raising of the early stage performance of concrete, reduce the risk that concrete produces defective in early days, improved concrete opposing rimose performance.
Simultaneously, for the operating mode of the primary concreting that solves ultra-large volume concrete, need to consider and research concrete pumping of C50 and parameters such as mechanical property and temperature rise.
(1) C50 concrete slump, divergence, the damage of collapsing in 1 hour in the present embodiment, collapsed that it is as shown in the table to decrease: the workability of C50 concrete when the stirring station issuance of materials in 2 hours
Figure 2011101458329100002DEST_PATH_IMAGE004
As seen from the above table, the workability of this C50 proportioning is relatively good, and the damage of not only collapsing is less, helps our long distance transportation, can supply simultaneously for a plurality of stirring stations, and can the concrete performance of better guarantees provide safeguard.Help pumping simultaneously.
(2) concrete 's air-containing
Following table is air content, molding temperature and the T500 of present embodiment C50 concrete when the stirring station issuance of materials
Proportioning Air content Molding temperature (℃) T500(1 hour)
The C50 proportioning 2.5% 17.5 18s
By last table parameter as can be known, this C50 concrete 's air-containing is moderate, needs 18s when divergence is trickled to 500mm, not only can ensure concrete strength development, and do not want disposable trickling can be for concrete placement the time reference and assurance be provided too greatly.This is because the mansion sole plate center of taking, center, the Shanghai concrete construction mode of blooming is carried out primary concreting (promptly at first builds from the position, the center of circle of cake type, then stir gradually and smash concrete to all around), this mode requires concrete trickling unsuitable excessive.
(3) the C50 concrete coagulating time is as shown in the table in the embodiment of the invention:
? Presetting period (h:min) Final setting time (h:min)
Mark is supported indoor 13:00 16:10
Stirring station is outdoor 21:30 24:25
As seen from the above table, can change to some extent the time of coagulation of ultra-large volume concrete along with the difference of envrionment temperature, but also be to satisfy the concrete pouring construction requirement.
(4) workability the during cast in situs of embodiment of the invention C50 concrete is as shown in the table:
Proportioning The slump (mm) Divergence (mm) The back taper time (s)
The C50 proportioning 210 550 6
Can be seen that by last table the slump and divergence that this C50 concrete is transported to behind the simulated field building site are all better, whole workability parcel property is good, helps pumping, pouring construction.
In the architectural process of center, priority project Shanghai mansion, as the super thick sole plate of ultra-large volume, the concrete mixture performance of C50 of the present invention is comparatively excellent, can satisfy our pumping, pouring construction requirement preferably.
In addition, we to the concrete resistance to compression of C50 of the present invention, anti-folding, split performances such as drawing, play mould and shaft center compression resistant and study and test.Its data are as shown in the table:
Figure 2011101458329100002DEST_PATH_IMAGE006
As seen from the above table, no matter be that ultimate compression strength or other split tensile strength all are can the good engineering design requirements with playing mould.
According to actual working conditions, arrange point for measuring temperature at the scene, monitoring equipment adopts the multi-point temp microcomputer measurement system.The temperature monitoring frequency should not be less than 1 time/2h temperature rise period and temperature-fall period preceding 5 days, and all the other should not be less than 1 time/4h, but end temp monitoring when the continuous 24h of the table temperature difference is less than 25 ℃ in the concrete.After the data of test are carried out aggregation process, can obtain the changing conditions of top temperature along with the length of time: there is certain Changing Pattern in the top temperature of C50 concrete every day along with increasing the length of time, very fast at preceding 2 days temperature rise rates, reaching top temperature during by the 4th day is 60.9 ℃, the every day of cooling gradually afterwards, cooling rate is no more than 1 ℃ average every day, satisfies our mass concrete code requirement.
The super thick C50 concrete of ultra-large volume satisfies outside the engineering design requirement at aspects such as mixture performance and weather resistance, simultaneously because 60,000 side C50 concrete are that disposable continuous placing is finished in 60 hours.This just needs this C50 concrete mix on the basis that meets design requirement, and also needs to satisfy operating mode and construction requirement.On the basis that guarantees concrete quality, on the basis of existing stirring technique, adjust production technique, so that better produce service effectively for the engineering concrete.Because concrete single-deck churning time is the main factor that influences the concrete production delivery rate.Therefore, in the improvement of stirring technique, consider the influence of churning time emphatically to the concrete mix state.
Mansion sole plate ultra-large volume super thick C50 concrete in center, Shanghai began to produce, build during 26 days ~ March 28 March in 2010.6 of forming of, Chang Qiao new by the Pu Lian of company, Pu, Pu liter, grand one-tenth and Citroen zx mix the station, are equipped with more than 400 transport mixer, carry out concrete production and supply.It is 19 pumps the most for a long time that on-the-spot pump truck distributes: 6 fixed pump+13 automotive pump (4 56m+9 platform 48m), will in 60 hours, 60,000 side's concrete disposable pumps be delivered to specified construction part together.By the joint efforts of each side, the concrete quality of center, Shanghai mansion sole plate has been obtained excellent achievement.60,000 concrete are satisfactory according to schedule to be finished, and diameter is that 121m is thick does not almost have bleeding and bleeding for the big disk concrete surface of 6m, maintenance simultaneously so far, concrete surface does not have the penetrance crack, there is not long and wide harm crack yet, only be the Craquelure that minute quantity is arranged on the surface at some position, whole base arrangement body is not had quality influence.And indexs such as concrete intensity meet design requirement.
The present invention is by selecting and the volume change the kind of the cement of concrete mix, mineral admixture, and the Synthesis of various factors such as admixture, is that the hydration heat of concrete correspondence when proportioning designs drops to lower degree.Pass through simultaneously researchs such as the super thick C50 concrete mixture characteristic of ultra-large volume, mechanical property and temperature rises, the various performance perameters of deep grasp C50 mass concrete satisfy construction and design requirements.Also have,, under the situation that guarantees concrete quality, bring into play the concrete production efficient that each mixes the station as much as possible, satisfy the general requirement of concrete supply and construction the improvement of concrete stirring technology.

Claims (6)

1. ultra-large volume high strength low hydration heat concrete is characterized in that this concrete includes following composition:
Component cube consumption kg/m 3
Cement 200~260
Breeze 100~160
Flyash 80~100
Fine aggregate 740~800
Coarse aggregate 1010~1050
Admixture 4.0~5.0
Water 155~165.
2. a kind of ultra-large volume high strength low hydration heat concrete according to claim 1 is characterized in that described cement is middle low heat cement, and its 3d hydration heat is 220KJ/Kg, and the 7d hydration heat is 289 KJ/Kg.
3. a kind of ultra-large volume high strength low hydration heat concrete according to claim 1 is characterized in that, described fine aggregate adopt fineness modulus greater than 2.3, silt content less than 2.0%, clod content is less than 0.5% natural medium sand.
4. a kind of ultra-large volume high strength low hydration heat concrete according to claim 1 is characterized in that, it is the rubble of 5~25mm that described coarse aggregate adopts particle diameter.
5. a kind of ultra-large volume high strength low hydration heat concrete according to claim 1, it is characterized in that, described admixture is the RP325 poly carboxylic acid series water reducer of modification, is added with viscosity modifier in the poly carboxylic acid series water reducer, and the mass percent of its volume is 0.1%~0.3%.
6. a kind of ultra-large volume high strength low hydration heat concrete according to claim 1 is characterized in that, in the described cement in blended material consumption and the concrete adulterant consumption sum be not less than 65% of binder total amount.
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CN103420656A (en) * 2013-08-06 2013-12-04 昆明理工大学 Self compact concrete
CN103437323A (en) * 2013-08-20 2013-12-11 福建省建筑科学研究院 Ecological mushroom concrete
CN103922671A (en) * 2014-03-31 2014-07-16 江苏扬建集团有限公司 High performance and low shrinkage concrete for cellar structure of oversized area
CN104817310A (en) * 2015-04-20 2015-08-05 中国水利水电科学研究院 Quantitative designing method of preparing low-heat and high crack-resisting hydraulic concrete by composite binding materials
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CN103437323B (en) * 2013-08-20 2015-10-28 福建省建筑科学研究院 A kind of ecological mushroom concrete
CN103922671A (en) * 2014-03-31 2014-07-16 江苏扬建集团有限公司 High performance and low shrinkage concrete for cellar structure of oversized area
CN104817310A (en) * 2015-04-20 2015-08-05 中国水利水电科学研究院 Quantitative designing method of preparing low-heat and high crack-resisting hydraulic concrete by composite binding materials
CN104817310B (en) * 2015-04-20 2016-07-27 中国水利水电科学研究院 Low grade fever high cracking resistance concrete for hydraulic structure quantifying design method is prepared with composite gelled material
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CN106892623B (en) * 2017-03-29 2019-05-31 云南建投绿色高性能混凝土股份有限公司 Metakaolin concrete and mixing proportion design method for ultra-large volume structure
CN107879691A (en) * 2017-05-09 2018-04-06 广西交通科学研究院有限公司 The mass concrete of C30/C40 rank Comprehensive Control heat of hydration temperature rises
CN107879691B (en) * 2017-05-09 2020-12-25 广西交通科学研究院有限公司 Large-volume concrete with hydration heat temperature comprehensively controlled at C30/C40 level
CN107445552A (en) * 2017-08-28 2017-12-08 北京铁建永泰新型建材有限公司 Cracking resistance enhancing large volume super-long structural concrete and preparation method thereof
CN108129092A (en) * 2017-12-29 2018-06-08 成都精准混凝土有限公司 Mass concrete and its preparation process
CN108529972A (en) * 2018-05-11 2018-09-14 东南大学 A kind of low thermal discharge, zero temperature rise concrete and preparation method thereof
CN108793887A (en) * 2018-07-26 2018-11-13 上海石化安东混凝土有限公司 A kind of mass concrete and preparation method thereof
CN108793887B (en) * 2018-07-26 2020-12-22 上海石化安东混凝土有限公司 Large-volume concrete and preparation method thereof
CN109356160A (en) * 2018-09-28 2019-02-19 宁波广天建通工程管理有限公司 A kind of construction method of mass concrete
CN109356160B (en) * 2018-09-28 2021-03-30 宁波广天建通工程管理有限公司 Construction method of mass concrete
CN109266320A (en) * 2018-11-06 2019-01-25 中国海洋石油集团有限公司 A kind of low hydration heat cement slurry
CN109400022A (en) * 2018-11-13 2019-03-01 江苏省安捷岩土工程有限公司 A kind of ultra-large volume high intensity low hydration heat concrete
CN109369076A (en) * 2018-11-21 2019-02-22 杭州金鼎实业有限公司 A kind of concrete and preparation method thereof
CN109369076B (en) * 2018-11-21 2021-09-07 杭州金鼎实业有限公司 Concrete and preparation method thereof
CN110028292A (en) * 2019-05-16 2019-07-19 中国三冶集团有限公司 A kind of preparation method inhibiting the high-strength concrete heat of hydration
CN111233400A (en) * 2020-02-25 2020-06-05 中建西部建设湖南有限公司 Three-level gravel-mixed low-heat cement concrete for harbor engineering
CN112062521A (en) * 2020-09-08 2020-12-11 天津市堃淏混凝土有限公司 Large-volume concrete and preparation method thereof
CN113009943A (en) * 2021-02-25 2021-06-22 中国三峡建设管理有限公司 Four-stage temperature control and lining method for thin-wall structure lining concrete
CN113372049A (en) * 2021-07-23 2021-09-10 新兴栈(绵阳)建材有限公司 Ultra-large-volume high-strength low-hydration-heat concrete
CN113880533A (en) * 2021-11-25 2022-01-04 十九冶成都建设有限公司 Ultra-large volume concrete
CN116063042A (en) * 2022-12-30 2023-05-05 中建西部建设湖南有限公司 Low-shrinkage low-hydration-heat concrete and preparation method and application thereof

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