Grading design method of thermally recycled asphalt mixture based on orthogonal design

Abstract

The invention discloses a grading design method of thermally recycled asphalt mixture based on orthogonal design. The method comprises the following steps: designing an orthogonal test, and fitting agrading curve closest to a real condition according to a result, thereby performing grading design; and providing a rapid and prepared design method for the design and construction of a thermally recycled pavement, thereby improving the quality of the thermally recycled asphalt pavement. The grading design method disclosed by the invention has a certain guiding significance for the large-scale overhauling work of the pavement. The grading dissociation problem caused by the conditions that the dispersion degree of the RAP cannot be directly defined and the different particle sizes have different dispersion degrees in the thermal mixing process can be reduced. Through the optimal horizontal combination of each gear of dispersion coefficient determined through the orthogonal design, the RAP after dissociation correction can be furthest close to the real dispersion state in the RAP mixing process. The construction efficiency and quality of the thermally recycled pavement are improved, theimprovement of the construction efficiency and the quality promotes the consumption of the RAP, and the design method conforms to the national and global sustainable development subject.

Description

technical field [0001] The invention relates to the field of road engineering, in particular to a gradation design method for hot recycled asphalt mixture based on orthogonal design. Background technique [0002] In the 70s and 80s of the last century, my country's road construction began to enter a stage of rapid development. Since the service life of roads is generally 10-20 years, most of the roads have entered the period of old road renovation. Among the methods, thermal regeneration is the mainstream. Thermal regeneration technology means adding a certain amount of recycled asphalt mixture to asphalt pavement recycled materials, and if necessary, adding a certain amount of regenerated agent to carry out thermal mixing, paving, rolling and other processes. In this process, the gradation design of recycled asphalt mixture is one of the important factors to determine the quality of pavement. As the old asphalt pavement is heated and loosened by the equipment, the formed o...

AI Technical Summary

Problems solved by technology

The grading should be between the grading results of direct screening and the results of combustion (or extraction), but this real grading cannot be directly obtained through experiments

The deviation between the gradation of recycled asphalt mixture and the real dispersion state will directly affect the accuracy of the mixture gradation design, thereby affecting the pavement construction and pavement quality

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