A production method of factory-mixed hot recycled asphalt concrete

Abstract

The invention provides a production method of plant-mixed hot recycled asphalt concrete. The method comprises a plant-mixed hot recycled asphalt concrete gradation determining method, a plant-mixed hot recycled asphalt concrete asphalt-aggregate ratio determining method and a plant-mixed hot recycled asphalt concrete preparation technology. Old materials are divided into three grades, the effect of variability of the old materials on the pavement performance of the plant-mixed hot recycled asphalt concrete is avoided, and meanwhile, plant-mixed hot recycled asphalt concrete with different pavement performance can be obtained by controlling the key sieve mesh passing rate. The test amount for determining the best asphalt adding amount is greatly decreased with the new asphalt adding amount estimation method of the plant-mixed hot recycled asphalt concrete; in the preparation process of the method, new materials and new asphalt are uniformly mixed, then heated old materials are added, the thickness difference between asphalt films of the new and old asphalt mixture is reduced, the asphalt amount is effectively reduced, and uneven mixing is avoided.

Description

technical field [0001] The invention relates to the technical field of road engineering, in particular to a production method of factory-mixed hot recycled asphalt concrete. Background technique [0002] During the use of the pavement, due to the comprehensive effect of the meteorological environment and traffic load, it will gradually decay and age. Various diseases occur, and then face maintenance, repair and produce a large amount of waste asphalt mixture. Therefore, asphalt pavement recycling technology has attracted more and more people's attention. Plant-mix hot recycling has a wide range of applications. It is the focus of domestic recycling technology research and is currently the most widely used recycling technology in the world. [0003] Conventional factory-mixed heat-recycled asphalt concrete does not take into account the gradation variation of old materials, which makes it difficult for the factory-mixed heat-recycled asphalt concrete gradation to meet the sp...

AI Technical Summary

Problems solved by technology

[0003] Conventional factory-mixed heat-recycled asphalt concrete does not take into account the gradation variation of old materials, which makes it difficult for the factory-mixed heat-recycled asphalt concrete to meet the specification requirements and has a large performance difference; The amount of asphalt is generally based on a large number of tests, and there is no method for estimating the amount of asphalt; in the mixing process, the old material and the new material are generally heated separately and then mixed, and then new asphalt is added to mix evenly. This process does not consider the mixing process. The difference in the distribution of asphalt film between new aggregates and old aggregates will lead to a large amount of graying aggregates due to the incomplete coating of new aggregates

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