A long-term water stability evaluation test device and method of asphalt mixture

Abstract

The invention relates to the technical field of water stability testing of asphalt mixtures, and particularly relates to an evaluation test device and evaluation method for the long-term water stability of an asphalt mixture. The test device comprises a loading device and a dynamic water environment simulation device, wherein the loading device comprises a loading pressing rod, an upper pressing plate, an anchor and a bearing plate, and the dynamic water environment simulation device comprises an ultrasonic transducer, a temperature controller, a heating pipe and a steel plate water tank. Thetest device can be used for simulating a stripping effect of the dynamic water pressure in the asphalt mixture on an aggregate particle asphalt film under the condition of wheel load. The water stability of the asphalt mixture is evaluated through the test residual rate and the asphalt film stripping rate, which is more in line with the actual damage situation of the asphalt pavement. According tothe test device and the evaluation method, the water stability of the asphalt mixture in a long-term use environment can be effectively evaluated.

Description

technical field [0001] The invention relates to the technical field of water stability testing of asphalt mixture, in particular to a long-term water stability evaluation test device and method of asphalt mixture. Background technique [0002] Water stability refers to the degree to which a substance is affected by water, also known as the water resistance or water resistance of a substance. Water damage to asphalt pavement means that under the action of water or freeze-thaw cycles on the pavement, due to the repeated action of external loads, water enters the pavement gap and continuously generates hydrodynamic pressure, and water gradually penetrates into the interface between asphalt and aggregate, reducing the asphalt and aggregate. Adhesion ability, and eventually the road disease that causes the asphalt to peel off from the aggregate. [0003] In the prior art, the water stability evaluation methods of asphalt mixture mainly include water immersion indirect tensile te...

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Problems solved by technology

However, although the above method simulates the action environment to a certain extent, it mainly indirectly evaluates the water stability of asphalt mixture through mechanical indicators, which is not completely consistent with the actual damage of asphalt pavement, which affects the accuracy of evaluation.

On the other hand, there are also techniques for judging the water stability of asphalt mixtures by comparing the time taken for the specimen to be destroyed, that is, comparing the fatigue life to determine the water stability of asphalt mixtures. The longer the fatigue life, the more the asphalt is. The better the water stability, the simpler the evaluation method is, which is not conducive to the development and progress of the water stability test of asphalt mixture.

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