Softening-point-test-based regenerant diffusion effect detection method

Abstract

The invention relates to a softening-point-test-based regenerant diffusion effect detection method. The method comprises the following steps of: putting a softening point sample ring onto a glass baseboard coated with a glycerinum talcum powder separant; preparing a pitch sample; cooling the pitch sample for 30 minutes at room temperature, and then slicking the pitch sample; putting the pitch sample and the glass baseboard into a container together, and pouring the regenerant into the container, wherein the liquid level of the regenerant is higher than the surface of the sample by about 1mm; warming the container in a constant temperature oven for different time of t; taking the container out of the oven, simultaneously, taking the pitch sample and the glass baseboard out of the container, cooling the pitch sample and the glass baseboard for 30 minutes at room temperature, slicking the pitch sample with a scraper, and erasing the regenerant around the sample ring; carrying out a softening point test, thus obtaining the softening point value R of the sample, corresponding to different thermal insulation time t; and carrying out data fitting according to a equation form of R=A*t+B, thus obtaining the evaluation index A of the diffusion effect of the regenerant. According to the regenerant diffusion effect detection method, the evaluation on the diffusion effect of the regenerant in a thermal regeneration process of a bituminous pavement is effectively realized, so that beneficial basis is offered for improving the performance evaluation as well as comparison and selection of the regenerant.

Description

technical field [0001] The invention belongs to the field of road engineering, and in particular relates to a method for detecting the diffusion effect of a regenerant based on a softening point test. Background technique [0002] Defects such as ruts, potholes, and oil spills on the asphalt pavement after several years of operation seriously affect the performance of the road, and it has to be rebuilt, resulting in a large amount of waste of old asphalt mixture. As a resource that can be recycled, old asphalt mixture has been paid more and more attention to its recycling. [0003] The recycling of asphalt mixture is to excavate, crush, and screen the old asphalt mixture that needs to be renovated or discarded, and then re-mix it with new aggregate, new asphalt and regeneration agent, etc., to form a certain road use. Performance recycled asphalt mixture. The key to the recycling of old asphalt mixture is whether the performance of the aged old asphalt can be restored, so ...

AI Technical Summary

Problems solved by technology

At present, the penetration test is mainly used to evaluate the diffusion effect of the regenerant. However, since the diffusion of the regenerant into the aged asphalt is non-ideal uniform diffusion, and with the increase of the diffusion time, this non-uniformity becomes more and more serious. The more obvious, the greater the variability of the penetration test, so that the penetration test cannot accurately reflect the diffusion effect of the regenerant, which affects the correct design and use of the performance of the recycled asphalt mixture

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