Evaluation method for migration path of residual moisture in foamed asphalt mixture

Abstract

The invention discloses an evaluation method for a migration path of residual water in a foamed asphalt mixture. The evaluation method comprises the following steps: S1, preparing a foamed asphalt mixture sample; s2, preparing the foamed asphalt mixture sample prepared in the step S1 into a foamed asphalt mixture detection test piece; s3, simulating a tire suction effect on the foamed asphalt mixture detection test piece prepared in the step S2 to obtain a foamed asphalt mixture test piece to be tested under the tire suction effect; s4, imaging residual moisture neutrons of the to-be-tested foamed asphalt mixture test piece obtained in the step S3 under the suction action of the tire; s5, recognizing the retention position of the residual moisture in the neutron imaging graph of the residual moisture of the to-be-tested piece of the foamed asphalt mixture under the tire suction effect obtained in the step S4; and S6, repeating the steps S1 to S5, and analyzing the migration path of the residual moisture of the to-be-tested foamed asphalt mixture piece under the suction action of different tires. The problems that the image of the residual moisture of the asphalt mixture cannot be obtained and the moisture migration and diffusion behavior cannot be expressed in an image mode are solved.

Description

technical field [0001] The invention belongs to the technical field of quantitative detection, and in particular relates to an evaluation method for the migration path of residual moisture in foamed asphalt mixture. Background technique [0002] Compared with ordinary hot-mix asphalt mixture, warm-mix asphalt mixture has better performance, and can be paved and constructed at a lower temperature. The construction temperature is reduced by 15-30°C, which can effectively reduce the heat emission on the construction site and smoke generation, the current warm mixing technology has been relatively well developed, and has become increasingly mature in technology and research and development. [0003] At present, emulsified asphalt warm mixing method and organic additive method are often used in China, that is, Evotherm warm mixing agent or Sasobit warm mixing agent is added to the asphalt mixture to achieve warm mixing. Compared with these technologies, foamed asphalt warm mixin...

AI Technical Summary

Problems solved by technology

[0004] However, the foamed asphalt warm mixing technology is not yet mature enough, and there are still some technical problems that have not been solved, including the main problem of water damage

The moisture introduced by the foaming process of foamed asphalt is likely to remain in the asphalt mixture after the construction is completed, and the moisture entrained in the asphalt pavement will reduce the adhesion and adhesion between the asphalt binder and the aggregate. Cohesion between asphalt binders, which in turn causes damage to asphalt pavements in the form of chipping, spalling, etc.

At the same time, under the action of traffic load, the asphalt pavement is subjected to the repeated action of vacuum negative pressure suction, which promotes the suction and backflow of the stagnant water inside the mixture, which further aggravates the water damage.

[0005] Therefore, in order to solve the main problem of water damage, it is first necessary to understand the content of residual moisture in the foamed asphalt mixture and the law of movement changes. However, in this technical field, there are still relatively few technical researches. The existing techniques for detecting moisture are complex and difficult to implement, and do not consider the aggravating effect of tire suction on water damage to foamed warm mix asphalt mixture

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