Forming test mold for asphalt mixture rutting test piece

Abstract

The invention discloses a forming test mold for an asphalt mixture rutting test piece. The forming test mold comprises an upper separating groove and a lower separating groove which are matched, wherein the upper separating groove and the lower separating groove are connected by a sliding locking device to form an opened container; a plurality of temperature sensors are arranged on the inner wall of the upper separating groove; the inner walls of the upper separating groove and the lower separating groove are respectively provided with an anti-sticking coating layer; and the outer walls and the bottom surfaces of the upper separating groove and the lower separating groove are respectively provided with a high-temperature heat-insulating coating layer. The forming test mold disclosed by the invention has the advantages that the demolding procedure after forming completion can be quickly realized; the upper separating groove and the lower separating groove can be separated only by unlocking the sliding locking device at the lower separating groove, so that the defect that the mold is taken out by using a rubber hammer to beat a bottom plate is overcome, the demolding efficiency is obviously improved, the disturbance to the test piece is less, and the influence of operation in the demolding process on all performances of the test piece is reduced.

Description

technical field [0001] The invention belongs to the technical field of indoor test instruments for performance evaluation of road asphalt pavement, and relates to a separate asphalt mixture rutting test piece forming test mold, in particular to an asphalt mixture rutting test piece forming test mold. Background technique [0002] Asphalt mixture is a typical viscoelastic material, and its physical and mechanical properties are closely related to temperature and loading time. Due to the viscoelastic properties of materials and the diversity of factors affecting the high temperature performance of asphalt pavement, the rutting disease of asphalt pavement structure has become a worldwide problem, and the research on permanent deformation (rutting, etc.) of asphalt pavement has always been the concern of road researchers Hot Issues. [0003] The asphalt mixture rutting test is used to measure the high-temperature anti-rutting ability of asphalt mixture, and it is used for the h...

AI Technical Summary

Problems solved by technology

[0005] 1) The thermal insulation effect is poor. The forming test mold of the rutting specimen is made of high-carbon steel or tool steel, and the heat conduction speed is fast, and it takes 5-6 minutes for the rutting specimen to be placed under the rolling wheel of the forming machine from the beginning of mold loading. The temperature loss in this process is about 15-20°C, and the number of rolling times generally requires 12 round-trips (24 times) to meet the requirements, and the temperature loss in this process will be about 10-15°C, which makes it difficult to observe and control the forming temperature of the specimen, and it is different from the There is a big difference in the paving temperature in the actual construction process;

[0006] 2) During the molding process of the traditional rut sample mold, the side plates and the bottom plates of the four side plates of the mold are easy to bond with the asphalt mixture specimen, and a piece of ordinary paper ( or newspaper) so that the bottom plate and side plates of the mold are separated by paper, which will cause paper to be stuck on the demoulded asphalt mixture sample and it is difficult to remove completely, thus affecting the performance test results of the sample, and in the Time-consuming and labor-intensive operation affects work efficiency and quality;

[0007] 3) The four side plates and the bottom plate of the commonly used rutting specimen forming test mold are fixed by multiple hexagonal bolts. When using this rutting forming mold to prepare asphalt mixture specimens, the size adjustment needs to adjust each hexagonal bolt. After a long period of use, the connection part of the mold will become loose. The process of demoulding is time-consuming and laborious, and it is easy to cause damage to the asphalt mixture specimen and affect the performance of the specimen.

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