Recycled asphalt concrete material for guaranteeing low-temperature performance and design method thereof

Abstract

The invention relates to a recycled asphalt concrete material for guaranteeing low-temperature performance and a design method thereof. The recycled asphalt concrete comprises the following componentsin parts by mass: 46.8 to 70 parts of an aggregate; 17.4 to 46.8 parts of an old material obtained by planing and washing an old road surface; 3.7 to 7 parts of mineral powder and 2.8 to 6.1 parts ofmodified asphalt or 70 # matrix asphalt. The maximum nominal particle diameter of the aggregate is 26.5 mm. The design method is as follows: 1) physical and mechanical tests are carried out on the asphalt material; 2) grading of aggregates with particle sizes below 4.75 mm which have significant influence on low temperature performance is determined; 3) volume filling rate of the aggregates withthe particle size of 19 mm after tamping is tested; 4) asphalt dosage is determined through rutting tests and low temperature trabecular tests, and material performance is verified. Compared with theexisting recycled asphalt concrete material and design method, the excellent low-temperature performance of the material can be ensured, small performance variation of the material can be ensured, therecycled asphalt concrete material has excellent high-temperature stability and water stability, makes full use of the old material, saves resources, protects the environment, and greatly reduces thecost of pavement materials in seasonal frozen areas.

Description

technical field [0001] The invention relates to a recycled asphalt concrete material with guaranteed low-temperature performance and a design method thereof, belonging to the technical field of civil engineering (road engineering). Background technique [0002] With the rapid development of the national economy, my country's traffic mileage continues to increase. Now, my country has made great achievements in expressway construction. By the end of 2013, the total mileage of my country's highway construction surpassed that of the United States, ranking first in the world. my country's seasonally frozen regions account for more than half of China's territory, but asphalt concrete materials and recycled asphalt concrete materials design methods are easy to crack in large areas under low temperature and vehicle load conditions, which is harmful to public driving safety and driving comfort. make a large impact. [0003] Recycled asphalt concrete material reuses the old asphalt co...

AI Technical Summary

Problems solved by technology

However, due to the addition of aging old materials, recycled asphalt concrete materials designed by existing technologies often have poor low-temperature performance and large material variability.

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