Method for determining optimal asphalt-aggregate ratios of rubber asphalt mixtures on basis of fatigue benefit coefficients

Abstract

The invention discloses a method for determining the optimal asphalt-aggregate ratios of rubber asphalt mixtures on the basis of fatigue benefit coefficients. The method sequentially includes steps of (1), determining mineral aggregate gradation of the rubber asphalt mixtures; (2), selecting 5 asphalt-aggregate ratios and manufacturing fatigue test pieces according to standards; (3), carrying out four-point bending fatigue tests and determining relations between the asphalt-aggregate ratios of the rubber asphalt mixtures and fatigue lives; (4), taking cost factors into consideration and determining the fatigue benefit coefficients; (5), drawing relation curve graphs of the fatigue benefit coefficients and the asphalt-aggregate ratios and determining the optimal asphalt-aggregate ratios; (6), verifying the road performance of the rubber asphalt mixtures for the determined optimal asphalt-aggregate ratios by the aid of shaping test pieces. The method has the advantages that the method is easy to use, the optimal asphalt-aggregate ratios can be determined by the aid of the method, rubber asphalt pavements are optimal in performance-cost ratio under the condition that the life cycles and the costs of the rubber asphalt pavements are taken into account, the construction costs of the asphalt pavements can be lowered, and the service lives of the asphalt pavements can be prolonged.

Description

technical field [0001] The invention belongs to the technical field of rubber asphalt mixture, in particular to a method for determining the optimum asphalt ratio of rubber asphalt mixture based on the fatigue benefit coefficient. Background technique [0002] In recent years, with the rapid development of my country's automobile industry and the increase in car ownership, a large number of waste rubber tires have been produced. The disposal of waste tires has not only become a social hot issue, but also directly affects the living environment and social development. Rubber-modified asphalt has been widely used in the field of road construction. It can not only consume a large number of waste tires, but also greatly improve the fatigue resistance of asphalt pavement, prolong the service life of the pavement, and generate huge social and environmental benefits. [0003] Fatigue failure is one of the main failure modes of asphalt pavement. Due to the sharp increase of road tr...

AI Technical Summary

Problems solved by technology

Due to the surge of road traffic in our country, the phenomenon of overloading and exceeding the limit is serious, which aggravates the fatigue damage of the asphalt pavement, shortens the service life of the road, and causes huge economic losses.

[0004] At present, the method for determining the optimum asphalt mixture ratio commonly used in my country is the Marshall design method. Although the Marshall design method is simple and the cost is low, the compaction forming method of the test piece in the Marshall design method cannot simulate the actual rolling of the road surface. The effect, stability and flow value have poor correlation with the pavement performance of asphalt mixture, and the test data is difficult to explain the long-term performance of asphalt pavement, and the design method does not consider the cost factor of the whole life cycle

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