A Method for Asphalt Mixture Water Stability Evaluation

A technology of asphalt mixture and water stability, which is applied in the direction of applying stable tension/pressure to test the strength of materials, analyzing materials, strength characteristics, etc., and can solve the influence of water stability without considering the degree of looseness inside the mixture, which cannot be simulated Problems such as pavement change process and impossibility of rapid evaluation can achieve the effect of shortening the test time, accelerating the damage process, and evaluating scientifically

Active Publication Date: 2020-11-27
山西省交通科技研发有限公司 +1
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Existing simulation methods only conduct tests at extreme temperatures of -18°C and 60°C, ignoring the influence of cumulative gradual changes, and cannot simulate the change process of pavement under interannual temperatures
The test results still only use the compressive strength as the evaluation index of water damage resistance, without considering the influence of the internal looseness of the mixture on the water stability
Not only that, but the test cycle is long, making quick evaluation impossible

Method used

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  • A Method for Asphalt Mixture Water Stability Evaluation
  • A Method for Asphalt Mixture Water Stability Evaluation

Examples

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Embodiment 1

[0024] A method for evaluating the water stability of asphalt mixture, the steps are as follows:

[0025] (1) First form 2 groups of asphalt mixture specimens, test the porosity of the specimens to ensure that the average porosity of the 2 groups of specimens is the same, and each group of specimens shall have no less than 4 specimens;

[0026] (2) Place the first group of test pieces at room temperature and wait for the test;

[0027] (3) Cycle the second group of test pieces for 3 times according to the following method, the specific steps are as follows:

[0028] The temperature range of the cycle is -20°C to 60°C to simulate the actual temperature environment of the asphalt pavement in the interannual range; when the environment is above 0°C, the specimen is placed in an ultrasonic oscillator filled with a solution for vibration treatment, ultrasonic The solution in the oscillator is an aqueous solution containing certain suspended particles to accelerate the simulation o...

Embodiment 2

[0037] A method for evaluating the water stability of asphalt mixture, the steps are as follows:

[0038] (1) First form 2 groups of asphalt mixture specimens, test the porosity of the specimens to ensure that the average porosity of the 2 groups of specimens is the same, and each group of specimens shall have no less than 4 specimens;

[0039] (2) Place the first group of test pieces at room temperature and wait for the test;

[0040] (3) Cycle the second group of test pieces for 3 times according to the following method, the specific steps are as follows:

[0041] The temperature range of the cycle is -20°C to 60°C to simulate the actual temperature environment of the asphalt pavement in the interannual range; when the environment is above 0°C, the specimen is placed in an ultrasonic oscillator filled with a solution for vibration treatment, ultrasonic The solution in the oscillator is an aqueous solution containing certain suspended particles to accelerate the simulation o...

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Abstract

The invention discloses an aquatic mixture water-stability evaluation method. The method comprises the following steps: arranging and forming two groups of prismatic mixture test pieces, ultrasonically oscillating and circulating one group of test pieces at the environment of -20 to 60 DEG C so as to quickly simulate emulsification, scouring and frost heaving effect of ice at low-temperature on the asphalt by the water, particles and like in the mixture under a load effect; performing strength testing on each of two groups of test pieces, firstly simulating the extrusion and peeling process between aggregates under the load effect, realizing the internal structure looseness of the mixture, wherein the looseness is represented as S, then applying breakdown pressure F to represent the capacity of resisting the external load by the internal of the mixture, and finally representing the advantage and the disadvantage of the mixture water stability as F / S of two groups of test pieces. The evaluation method disclosed by the invention can accelerate the simulation of breakdown process on the asphalt pavement under the load, the moisture, the particles, the temperature and like element coupling effects, and the test efficiency is improved; the influences on the mixture water stability by the external breakdown load and the internal looseness are coupled through the evaluation method, and the result is more scientific.

Description

technical field [0001] The invention relates to the technical field of asphalt engineering, in particular to a method for evaluating the water stability of asphalt mixture. Background technique [0002] The evaluation of the water stability of asphalt mixture in the current specification mainly adopts freeze-thaw splitting test, submerged Marshall test and submerged rutting test. None of the above methods can reflect the actual situation, that is, it is impossible to simulate the scouring and emulsification of the asphalt film by the moisture inside the mixture under the action of the vehicle load, which leads to the inconsistency between the evaluation results in the laboratory and the actual project. [0003] In recent years, some improved evaluation methods have gradually appeared around the freeze-thaw splitting test. Water erosion tests on asphalt mixtures are mainly carried out by scouring with alternating pressure changes. Compared with the conventional method, this...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N1/42G01N3/08
CPCG01N1/28G01N1/286G01N1/42G01N3/08G01N2203/0019
Inventor 王威殷传峰陈俊伟马德崇游晓英樊长昕杨坤
Owner 山西省交通科技研发有限公司
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