Micro-surfacing mixture mineral aggregate grading optimization design method

Abstract

The invention discloses a micro-surfacing mixture mineral aggregate grading optimization design method. The method comprises the following steps of 1) determining different mineral aggregate grading schemes through the throughput of key sieve holes; 2) determining the stacking density of each scheme of the different mineral aggregate grading schemes; 3) performing initial performance testing on different graded mineral aggregates; 4) determining physical and mechanical indexes of the different graded mineral aggregates; 5) performing road performance examination on the different graded mineral aggregates; 6) determining micro-surfacing mixture optimal mineral aggregate grading. According to the method disclosed by the invention, the quality of the micro-surfacing mixture mineral aggregate grading is judged by adopting an aggregate stacking density method, so that a micro-surfacing mixture with a dense framework structure is obtained; moreover, the earlier-stage and later-stage road performances of the micro-surfacing mixture are comprehensively considered, so that a micro-surfacing mixture with great high temperature stability, skid resistance and relatively high abrasion resistance is obtained. According to the design method provided by the invention, test data is accurate and reliable; by referring to a testing method for a hot-mixed asphalt mixture, the popularization value is very good.

Description

Technical field [0001] The invention belongs to the technical field of highway asphalt pavement maintenance engineering, and specifically relates to an optimized design method for the gradation of a mixture of mineral materials at a micro-surface. Background technique [0002] As of the end of 2012, the total mileage of my country's road network reached 4.1 million kilometers, including 96,000 kilometers of expressways. A national road network with trunk and branch connections, reasonable layout, and extending in all directions has taken shape. In highways that have been built (or under construction), asphalt pavements are popular for their good performance and have been widely used. However, the convenient and fast transportation method has caused the traffic volume to grow rapidly, which has greatly exceeded the original design traffic volume, and the heavy load and overload of vehicles have caused some expressways to appear within 1 to 3 years or even less when they were compl...

AI Technical Summary

Problems solved by technology

However, there are still some problems in practical engineering applications. For example, the anti-loosening performance of the mixture at the micro-surface is insufficient during use, which may easily cause stones to fall off; new ruts are generated at the micro-surface that is newly filled with ruts; the noise inside the vehicle is too loud; Poor crack resistance; some road sections have peeling, rutting and other diseases shortly after opening to traffic

The reasons for these diseases are related to construction, and more importantly, the optimization design of mineral material grading for micro-surfacing mixtures is currently neglected, resulting in no good micro-surfacing mixtures.

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