CN109883860A - A kind of mixture wholegrain diameter range is gathered materials crush values dynamic measuring method - Google Patents
A kind of mixture wholegrain diameter range is gathered materials crush values dynamic measuring method Download PDFInfo
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Abstract
Gather materials crush values dynamic measuring method the invention discloses a kind of mixture wholegrain diameter range, belong to road engineering test field, the technical problem to be solved in the present invention is how to simulate the practical embedded squeezing situation gathered materials in mixture, reflect the aggregate crusher situation in full particle size range, reduce the deviation of the simulation for the stress gathered materials under vibroroller cmpacting in practical projects simultaneously, the technical solution of use are as follows: this method comprises the following steps: (1), preparing aggregate mixture；(2), sieve aggregate mixture is returned；(3), sample mass m is determined0；(4), holding temperature is determined；(5), weighing quality is m0Aggregate mixture be packed into examination cylinder and precompressed；6), heat preservation to be measured of gathering materials；(7), dynamically load；(8), cooling and screening to be measured of gathering materials；(9), calculating crush values Q: crush values Q is the sum of the absolute value of stress correspondence sieve pore percent of pass difference of gathering materials.
Description
Technical field
Field is tested the present invention relates to road engineering, and specifically a kind of mixture wholegrain diameter range crush values of gathering materials are dynamic
State measuring method.
Background technique
Crush values of gathering materials are to measure to gather materials to resist the important indicator of breaking capacity under load action, are used in highway engineering
Gather materials mechanical property in evaluation.Examination in current J TG E42-2005 " highway engineering gather materials testing regulations " about crush values of gathering materials
Proved recipe method exists following insufficient: a, selecting 9.5mm-13.2mm coarse aggregate as sample, but the aggregate crusher in Practical Project is existing
As not only occurring over just the particle size range, but whole particle size ranges in mixture almost occur；B, specified particle diameter range
Gather materials the practical embedded squeezing situation that is difficult to simulate and gather materials in mixture, stress also will be different；C, with 2.36mm sieve pore work
It will lead to following situation for unique crush values evaluation criterion: gathering materials and be crushed, be not broken to through 2.36mm sieve pore, this part
It is unstable that the refinement that broken situation can not reflect, but gather materials will lead to gradation, finally influences Engineering Quality Control；D, it can not react
Crush values of gathering materials after high-temperature heating, it is most of it is used for asphalt mixture gather materials need to be by high-temperature heating, gathering materials after high temperature is anti-broken
Fragility can certainly will change；E, test process is difficult to simulate actual loading situation of gathering materials, and existing test method is required in 10min
Left and right total load head adds to 400kN, which is also easy to produce human error, and loading method is to gather materials in squash type, with Practical Project
There are relatively large deviations for stress under vibroroller cmpacting.
The patent document of Patent No. CN102147349A discloses a kind of measuring method of crushing value of fine aggregate, comprising:
(1) it samples, drying is sieved into simple grain diameter sample；(2) it heats；(3) high temperature rolls；(4) it sieves, calculates the crushing matter of fine aggregate
Measure percentage.The technical solution propose by the fine aggregate of different size it is heated after be placed on the steel plate of certain size using wheel
The mode of stone roller measures crushing value of fine aggregate, although the part for compensating for conventional test methods is insufficient, still can not simulate collection
Expect the practical embedded squeezing situation in mixture, can not reflect the aggregate crusher situation in full particle size range, while to Practical Project
In the simulation of stress gathered materials under vibroroller cmpacting there are relatively large deviations.
The patent document of Patent No. CN102967520A discloses a kind of measuring method of crush values of gathering materials, specific method
It is as follows: take certain mass air-dry or the particle size of drying gathering materials as sample within a predetermined range, measurement is packed into first
Then equal the gathering materials of quality is fitted into rotary compactor die trial by tamping state aggregate quality needed for die trial predetermined altitude,
It is heated to the rotary compactor die trial to be put into rotary compactor pedestal after required temperature, presses it from rotation after being further applied load
Real instrument pedestal is cooled down after taking out, and finally by the taking-up of gathering materials in the rotary compactor die trial, crosses the first standard screen, measurement
It obtains finally calculating the crush values gathered materials in current sample according to formula by the aggregate quality of first standard screen.The skill
Art scheme is proposed that the coarse aggregate of 9.5mm-13.2mm is heated to different temperatures depending on mix type, is measured using rotary compactor
Crush values of gathering materials still can not be simulated and gather materials in mixture although the part for compensating for conventional test methods is insufficient
Practical embedded squeezing situation, can not reflect the aggregate crusher situation in full particle size range, while to gathering materials in Practical Project in vibrating roller
There are relatively large deviations for the simulation of the stress of pressure.
In conclusion how to simulate the practical embedded squeezing situation gathered materials in mixture, reflect gathering materials in full particle size range
Broken situation, while the deviation for reducing the simulation for the stress gathered materials under vibroroller cmpacting in practical projects is the prior art
In technical problem urgently to be solved.
Summary of the invention
Technical assignment of the invention is to provide a kind of mixture wholegrain diameter range and gathers materials crush values dynamic measuring method, to solve
The practical embedded squeezing situation gathered materials in mixture certainly how is simulated, reflects the aggregate crusher situation in full particle size range, subtracts simultaneously
The problem of deviation of the simulation of the small stress under vibroroller cmpacting of gathering materials in practical projects.
Technical assignment of the invention realizes in the following manner, and a kind of mixture wholegrain diameter range is gathered materials crush values dynamic
Measuring method, this method comprises the following steps:
(1), it prepares aggregate mixture: preparing aggregate mixture by gradation design result；
(2), it returns sieve aggregate mixture: sieve being carried out back to configured aggregate mixture using standard screen, remembers that each sieve pore is logical
Crossing rate is P1、P2、P3...Pi, and screen out screen size and gather materials for i is below；
(3), it determines sample mass: sample being uniformly packed into examination cylinder several times (every sub-quantity is roughly the same), will every time
Specimen surface leveling, is put into universal press by pressure head with the preload pressure precompressed 10-45s of 0.2-0.5 times of maximum load value,
Purpose is to guarantee sufficiently embedded squeezing contact between mixture particle, and paver hammer ram is formed it initial when simulating mixture laying
Compacting, makes the thickness of height mixture laying layer of the final sample in examination cylinder, which is denoted as m0；
(4), holding temperature is determined: according to mix type, highest experienced to be measured when producing the mixture of gathering materials
Temperature is sample holding temperature, can reflect the resistant to breakage situation gathered materials after undergoing most harsh use process；
(5), weighing quality is m0Aggregate mixture be packed into examination cylinder and precompressed: by (the every sub-quantity to be measured several times that gathers materials
It is roughly the same) it is uniformly packed into examination cylinder, surface of aggregate to be measured is flattened every time, is put into universal press by pressure head with 0.2-
The preload pressure precompressed 10-45s of 0.5 times of maximum load value, purpose are to guarantee sufficiently embedded squeezing contact, simulation between mixture particle
The initial compacting that paver hammer ram forms it when mixture laying makes the final height mixing to be measured gathered materials in examination cylinder
Expect the thickness of paving layer；
(6), collection material strip cylinder to be measured heat preservation to be measured of gathering materials: is placed in environmental cabinet heat preservation 2-8h；
(7), dynamically load: being 400-800kPa pairs to load sinusoidal waveform, loading frequency 25-65Hz, peak load
It is to be measured gather materials loaded；
(8), cooling and screening to be measured of gathering materials: the taking-up to be measured of gathering materials after the completion of load is cooled to room temperature, using standard
Sieve screening remembers that each sieve pore percent of pass is P '1、P′2、P′3...P′i；
(9), calculating crush values Q: crush values Q is the sum of the absolute value of stress correspondence sieve pore percent of pass difference of gathering materials,
Being crushed the crush values that situation characterization is gathered materials with the mixture in the full particle size range of mixture more accurately, strictly more can control collection
Item matter guarantees construction quality, specific formula is as follows:
Q=| P1-P′1|+|P2-P′2|+|P3-P′3|+…+|Pi-P′i|。
Preferably, P in the step (2)1、P2、P3...PiIn subscript 1,2,3 ..., i it is descending successively right
Answer standard screen screen size, wherein i=2.36mm screens out 2.36mm or less fine aggregate, it is considered that 2.36 or less fine aggregates
Skeleton function is not played in mixture, therefore it will not be occurred to be crushed by load action substantially.
More preferably, the step (3) and step (5) pilot scale cylinder internal diameter are 150mm, wall thickness 8mm, are highly 200mm, pressure
Head diameter is 149mm, with a thickness of 50mm, tries cylinder and passes through sleeve connection universal press.
More preferably, the preload pressure of universal press is 0.3 times of maximum load value in the step (3) and step (5), in advance
A length of 30s when pressure.
Preferably, in the step (6) environmental cabinet temperature controllable to 300 DEG C, 0.1 DEG C of temperature-controlled precision, guarantee it is to be measured gather materials,
It is in set temperature with the test parts and test process of aggregate contact to be measured, most accurately reflects temperature to crush values of gathering materials
Influence.
More preferably, environmental cabinet keeps the temperature duration 5h in the step (6).
Preferably, dynamically load process in the step (7) are as follows: peak load static pressure 1min → sinusoidal wave load load
3min → peak load static pressure 1min sufficiently simulates the static pressure that road roller generates mixture during first pressing, multiple pressure, final pressure
And vibrating compacting effect.
It more preferably, is 45Hz to the loading frequency to be measured to gather materials in the step (7), the Non-intermittent time, peak load is
600kPa。
Mixture wholegrain diameter range of the invention crush values dynamic measuring method of gathering materials has the advantage that
(1), for the present invention using aggregate mixture as sample, broken 2.36mm will not be occurred substantially with lower part by screening out
Point, can preferably simulate the practical interlocking condition to gather materials in mixture, while can also reflect 2.36mm it is all of above gather materials to
The ability of resistant to breakage；
(2), the present invention determines sample quantities in such a way that 0.3 times of peak load and pressure precompressed are gathered materials to paving thickness,
Sufficiently simulation is gathered materials in the interlocking condition of practical paving thickness；
(3), the maximum temperature for experience of gathering materials during selection target aggregate production asphalt is holding temperature, is protected
Demonstrate,prove it is to be measured gather materials with the test parts of aggregate contact to be measured and test process be in set temperature, most accurately reflection temperature pair
The influence for crush values of gathering materials；
(4), load is provided by universal testing machine, and Loaded contact analysis is sine wave, loading frequency 45Hz, Non-intermittent time, peak
It is worth load 600kPa, loading procedure are as follows: peak load static pressure 1min → Sine-wave loading 3min → peak load static pressure 1min fills
Divide simulation road roller during first pressing, multiple pressure, final pressure to the static pressure and vibrating compacting effect of mixture generation；
(5), crush values Q of the present invention be gather materials stress correspondence sieve pore percent of pass difference absolute value sum, with mixed
It closes and expects that the mixture in full particle size range is crushed the crush values that situation characterization is gathered materials and more accurately, strictly more can control collection item
Matter guarantees construction quality.
Specific embodiment
Referring to specific embodiment to a kind of mixture wholegrain diameter range of the invention gather materials crush values dynamic measuring method make
It is explained in detail below.
Embodiment 1:
Mixture wholegrain diameter range of the invention is gathered materials crush values dynamic measuring method, and this method comprises the following steps:
(1), it prepares aggregate mixture: preparing aggregate mixture by gradation design result；
(2), it returns sieve aggregate mixture: sieve being carried out back to configured aggregate mixture using standard screen, remembers that each sieve pore is logical
Crossing rate is P1、P2、P3...Pi, and screen out screen size and gather materials for i is below；Wherein, P1、P2、P3...PiIn subscript 1,2,
3 ..., i is descending is corresponding in turn to standard screen screen size, wherein and i=2.36mm screens out 2.36mm or less fine aggregate, and one
As think that 2.36 or less fine aggregates do not play skeleton function in mixture, therefore its will not be occurred substantially by load action it is broken；
(3), it determines sample mass: sample being uniformly packed into examination cylinder several times (every sub-quantity is roughly the same), will every time
Specimen surface leveling is put into universal press by pressure head with the preload pressure precompressed 30s of 0.3 times of maximum load value, and purpose is
Guarantee that sufficiently embedded squeezing contacts between mixture particle, the initial compacting that paver hammer ram forms it when simulating mixture laying,
Make the thickness of height mixture laying layer of the final sample in examination cylinder, which is denoted as m0；Wherein, cylinder internal diameter is tried
It is highly 200mm for 150mm, wall thickness 8mm, it is omnipotent by sleeve connection to try cylinder with a thickness of 50mm by pressure head diameter 149mm
Press machine；
(4), holding temperature is determined: according to mix type, highest experienced to be measured when producing the mixture of gathering materials
Temperature is sample holding temperature, can reflect the resistant to breakage situation gathered materials after undergoing most harsh use process；
(5), weighing quality is m0Aggregate mixture be packed into examination cylinder and precompressed: by (the every sub-quantity to be measured several times that gathers materials
It is roughly the same) it is uniformly packed into examination cylinder, surface of aggregate to be measured is flattened every time, is put into universal press by pressure head with 0.3 times
The preload pressure precompressed 30s of maximum load value, purpose are to guarantee sufficiently embedded squeezing contact between mixture particle, simulation mixture booth
The initial compacting that paver hammer ram forms it when paving makes the final height mixture laying layer to be measured to gather materials in examination cylinder
Thickness；
(6), collection material strip cylinder to be measured heat preservation to be measured of gathering materials: is placed in environmental cabinet heat preservation 5h；Wherein, environmental cabinet temperature controllable is extremely
300 DEG C, 0.1 DEG C of temperature-controlled precision, guarantee is to be measured to gather materials, is in setting with the test parts of aggregate contact to be measured and test process
Temperature, most accurately influence of the reflection temperature to crush values of gathering materials；
(7), dynamically load: to load sinusoidal waveform, loading frequency 45Hz, Non-intermittent time, peak load are
600kPa to it is to be measured gather materials load；Wherein, dynamically load process are as follows: peak load static pressure 1min → sinusoidal wave load load
3min → peak load static pressure 1min sufficiently simulates the static pressure that road roller generates mixture during first pressing, multiple pressure, final pressure
And vibrating compacting effect
(8), cooling and screening to be measured of gathering materials: the taking-up to be measured of gathering materials after the completion of load is cooled to room temperature, using standard
Sieve screening remembers that each sieve pore percent of pass is P '1、P′2、P′3...P′i；
(9), calculating crush values Q: crush values Q is the sum of the absolute value of stress correspondence sieve pore percent of pass difference of gathering materials,
Being crushed the crush values that situation characterization is gathered materials with the mixture in the full particle size range of mixture more accurately, strictly more can control collection
Item matter guarantees construction quality, specific formula is as follows:
Q=| P1-P′1|+|P2-P′2|+|P3-P′3|+…+|Pi-P′i|。
Embodiment 2:
By taking the AC-16 type aggregate mixture of 3000g (screening out the part 2.36mm or less) as an example:
The screening screening result of broken front and back is as follows:
Weight is 696.3g, percent of pass 76.8% on 16mm sieve before broken；The upper middle 596g of sieve after broken, percent of pass 80.1%,
Difference 3.3%；
Weight 431.9g on broken preceding 13.2mm sieve, percent of pass 62.4%；Weight 400g on sieve after broken, percent of pass 66.8%,
Difference 4.4%；Other sieve pores are similar.
Calculate crush values Q:7.7%=| 76.8%-80.1% |+| 62.4%-66.8% |.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (8)
- The crush values dynamic measuring method 1. a kind of mixture wholegrain diameter range is gathered materials, which is characterized in that this method includes following step It is rapid:(1), it prepares aggregate mixture: preparing aggregate mixture by gradation design result；(2), it returns sieve aggregate mixture: sieve being carried out back to configured aggregate mixture using standard screen, remembers each sieve pore percent of pass For P1、P2、P3...Pi, and screen out screen size and gather materials for i is below；(3), it determines sample mass: sample being uniformly packed into examination cylinder several times, specimen surface is flattened every time, is put into omnipotent pressure Power machine, with the preload pressure precompressed 10-45s of 0.2-0.5 times of maximum load value, makes final sample in examination cylinder by pressure head Height is the thickness of mixture laying layer, which is denoted as m0；(4), holding temperature is determined: according to mix type, maximum temperature experienced to be measured when producing the mixture of gathering materials For sample holding temperature；(5), weighing quality is m0Aggregate mixture be packed into examination cylinder and precompressed: by it is to be measured gather materials uniformly be packed into examination cylinder several times, often It is secondary to flatten surface of aggregate to be measured, universal press is put by pressure head with the preload pressure of 0.2-0.5 times of maximum load value Precompressed 10-45s makes the thickness of the final height mixture laying layer in examination cylinder to be measured that gathers materials；(6), collection material strip cylinder to be measured heat preservation to be measured of gathering materials: is placed in environmental cabinet heat preservation 2-8h；(7), dynamically load: being 400-800kPa to be measured to load sinusoidal waveform, loading frequency 25-65Hz, peak load Gather materials and is loaded；(8), cooling and screening to be measured of gathering materials: the taking-up to be measured of gathering materials after the completion of load is cooled to room temperature, is sieved using standard screen Point, remember that each sieve pore percent of pass is P '1、P′2、P′3...P′i；(9), calculating crush values Q: crush values Q is the sum of the absolute value of stress correspondence sieve pore percent of pass difference of gathering materials, specifically Formula is as follows:Q=| P1-P′1|+|P2-P′2|+|P3-P′3|+…+|Pi-P′i|。
- The crush values dynamic measuring method 2. mixture wholegrain diameter range according to claim 1 is gathered materials, which is characterized in that institute State P in step (2)1、P2、P3...PiIn subscript 1,2,3 ..., i is descending is corresponding in turn to standard screen screen size, In, i=2.36mm.
- The crush values dynamic measuring method 3. mixture wholegrain diameter range according to claim 1 or 2 is gathered materials, feature exist In it is highly 200mm, pressure head diameter is that the step (3) and step (5) pilot scale cylinder internal diameter, which are 150mm, wall thickness 8mm, 149mm tries cylinder and passes through sleeve connection universal press with a thickness of 50mm.
- The crush values dynamic measuring method 4. mixture wholegrain diameter range according to claim 3 is gathered materials, which is characterized in that institute The preload pressure for stating universal press in step (3) and step (5) is 0.3 times of maximum load value, when precompressed a length of 30s.
- The crush values dynamic measuring method 5. mixture wholegrain diameter range according to claim 1 is gathered materials, which is characterized in that institute Environmental cabinet temperature controllable is stated in step (6) to 300 DEG C, 0.1 DEG C of temperature-controlled precision.
- 6. mixture wholegrain diameter range is gathered materials crush values dynamic measuring method according to claim 1 or 5, feature exists In environmental cabinet keeps the temperature duration 5h in the step (6).
- The crush values dynamic measuring method 7. mixture wholegrain diameter range according to claim 1 is gathered materials, which is characterized in that institute State dynamically load process in step (7) are as follows: peak load static pressure 1min → sinusoidal wave load loads 3min → peak load static pressure 1min。
- The crush values dynamic measuring method 8. mixture wholegrain diameter range according to claim 1 or claim 7 is gathered materials, feature exist In, in the step (7) to the loading frequency to be measured to gather materials be 45Hz, the Non-intermittent time, peak load 600kPa.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112067455A (en) * | 2020-07-22 | 2020-12-11 | 四川科路泰交通科技有限公司 | High-temperature crushing value test method for coarse aggregate |
| CN112082857A (en) * | 2020-07-27 | 2020-12-15 | 河海大学 | Evaluation index and test method for compression resistance of glass beads for roads |
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Effective date of registration: 20210713 Address after: No. 1877, Gangxi Road, Ganggou street, Licheng District, Jinan City, Shandong Province Patentee after: SHANDONG TRANSPORTATION INSTITUE Patentee after: SHANDONG HI-SPEED Co.,Ltd. Address before: No.38, wuyingshanzhong Road, Jinan, Shandong 250031 Patentee before: SHANDONG TRANSPORTATION INSTITUE |