Method for testing initial stripping time of adhesiveness of coarse aggregate and asphalt

A test method and coarse aggregate technology, applied in the direction of measuring devices, analysis materials, instruments, etc., can solve the problems of long test results, large deviations of test results, water temperature fluctuations, etc., to reduce the influence of human factors and avoid water overheating Phenomenon, the effect of avoiding judgment bias

Inactive Publication Date: 2021-08-13
CHINA INST OF WATER RESOURCES & HYDROPOWER RES +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the application of acidic aggregates in water conservancy projects, due to the requirements of water stability and other indicators, the requirements for the adhesion between asphalt and coarse aggregate are relatively high. At this time, the initial peeling time of asphalt and coarse aggregate mixed with anti-stripping agent is mostly It reaches more than 20 minutes, and some even reach 60 minutes. At this time, the water in the beaker has been in a slight boiling state for a long time, and the volatilization is relatively large.
And if the peeling time mentioned in CN201610842579.5 is used as an indicator, this time will increase exponentially, and the water in the boiling state will volatilize more, which is facing the problem of whether to continue the water in the beaker
If the water is not continued, the aggregate dipped in asphalt will deviate from the middle of the water in the beaker, and the water temperature around the aggregate will gradually decrease, resulting in a longer test result. In serious cases, the stones dipped in asphalt may be exposed to the water surface
If the water is continued, it will easily lead to fluctuations in the water temperature and affect the test results
[0008] In addition, the CN201610842579.5 uses boiling water, and different people have different perceptions of the state of boiling water, and the peeling time of different degrees of boiling asphalt is different, resulting in large deviations in test results

Method used

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  • Method for testing initial stripping time of adhesiveness of coarse aggregate and asphalt
  • Method for testing initial stripping time of adhesiveness of coarse aggregate and asphalt
  • Method for testing initial stripping time of adhesiveness of coarse aggregate and asphalt

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Carry out the adhesion test according to the test method in the adhesion test of 6.11 coarse aggregate and asphalt in "Hydraulic Asphalt Concrete Test Regulations" (DL / T5362-2018) and the test method of the present invention respectively, and test the acidic gneiss coarse aggregate In the two test methods, the adhesion effect classification or initial peeling time difference between alkaline limestone coarse aggregate and hydraulic asphalt, modified asphalt, and anti-stripping agent was added, and 5 coarse aggregates were taken for each group.

[0041] The present invention adopts concrete steps as follows:

[0042] 1) Take 5 coarse aggregates with a particle size of 13mm-19mm, put them in an enamel plate, wash them, dry them in an oven with a set temperature of 105°C for 2 hours, take them out and cool them to room temperature for later use;

[0043] 2) Lay a single layer of gravel covering about 1 / 8 of the bottom area of ​​the beakers at the bottom of five 1000mL beak...

Embodiment 2

[0053] 1) Take acidic coarse aggregate gneiss particles with a particle size of 13mm-19mm, put them in an enamel plate, wash them, dry them in an oven with a set temperature of 105°C for 2 hours, take them out and cool them to room temperature for later use;

[0054] 2) Lay a single layer of gravel covering about 1 / 8 of the bottom area of ​​the beakers at the bottom of five 1000mL beakers, then fill the beakers with water and put them on a heating furnace with an asbestos net, and boil the water to a slight boil;

[0055] 3) Fasten the coarse aggregates one by one with thin iron wires, and place them in an oven with a set temperature of 30°C for 30 minutes to preheat;

[0056] 4) Preheated to 150 ℃ 70 # Take the hydraulic asphalt out of the oven, take 5 preheated coarse aggregates, and immerse them in the asphalt for 45 seconds, so that the surface of the coarse aggregates is completely covered by the asphalt;

[0057] 5) Hang the asphalt-coated coarse aggregate on the test f...

Embodiment 3

[0061] 1) Take acidic coarse aggregate gneiss particles with a particle size of 13mm-19mm, put them in an enamel plate, wash them, dry them in an oven with a set temperature of 105°C for 2 hours, take them out and cool them to room temperature for later use;

[0062] 2) Lay a single layer of zeolite at the bottom of three 1000mL beakers, accounting for about 1 / 5 of the bottom area of ​​the beakers, then fill the beakers with water and put them on a heating furnace with an asbestos net, and boil the water to a slight boil;

[0063] 3) Fasten the coarse aggregates one by one with thin iron wires, and place them in an oven with a set temperature of 50°C for 15 minutes to preheat;

[0064] 4) Preheated to 140 ℃ 70 # Take the hydraulic asphalt out of the oven, take 3 preheated coarse aggregates, and immerse them in the asphalt for 45 seconds, so that the surface of the coarse aggregates is completely covered by the asphalt;

[0065] 5) Hang the asphalt-coated coarse aggregate on t...

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Abstract

The invention provides a method for testing initial stripping time of adhesiveness of coarse aggregate and asphalt, and belongs to the field of hydraulic engineering asphalt concrete. According to the method, the adhesiveness of the asphalt and the coarse aggregate is represented by using the initial stripping time instead of the adhesion grade in the current specification 'Test code for hydraulic asphalt concrete' (DL / T5362-2018), so that the application range of the adhesiveness test method is expanded, and quantitative measurement of the adhesiveness of the asphalt and the coarse aggregate can be realized. And the adhesiveness of the asphalt doped with the anti-stripping agent and the acidic aggregate can be compared with the adhesiveness of the asphalt and the alkaline aggregate. According to the method, measures for preventing water from being overheated are taken, a micro-boiling state is specified, an initial stripping state is taken as a test end point, and the method is simple, convenient and visual, and data are objective and reliable. The method has important significance for guiding the application of the acid aggregate in the asphalt concrete impermeable panel of the pumped storage power station.

Description

technical field [0001] The invention belongs to the field of water conservancy project construction and relates to a method for testing the initial peeling time of the adhesion between coarse aggregate and asphalt. Background technique [0002] my country will speed up the construction of pumped storage power stations, and RCC has been widely used as an anti-seepage panel in the anti-seepage of the upper reservoir of the pumped storage power station. However, due to the influence of material properties, currently only alkaline aggregates such as limestone are used in hydraulic asphalt concrete. Some projects have no alkaline aggregates nearby or projects have a large amount of acidic excavation materials that need to be processed, which delays the progress of the project. construction, and increased construction costs. In order to meet the engineering needs and speed up the construction of water conservancy projects, the application of acid aggregates in anti-seepage panels...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/04
CPCG01N19/04
Inventor 马临涛汪正兴张福成夏世法火霞高曙光付颖千郝巨涛
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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