ASSURANCE OF THE QUALITY OF THE ASPHALT CONCRETE COATING IN THE ZONE OF THE LONGITUDINAL JOINT OF STRIPS

Abstract

The article deals with the issue of high-quality compaction of the asphalt concrete mixture during the arrangement of coatings separately along the traffic lanes. It was determined that the main causes of defects in the operation of such coatings are insufficient density and excessive porosity of asphalt concrete in the joint area. The paper analyzes the results of studies that show that the temperature distribution of the mixture along the width of the coating strip is uneven. The coldest and most enriched with large crushed stone areas are found in the zone of joints. The article considers a model of heating a cold joint due to heat from a layer of hot mixture that is placed on the adjacent strip. Depending on the temperature difference between the layers, the increase in the temperature of the edge of the previously laid grip is from 15 °C to 20 °C. However, this is not enough for high-quality sealing of the layer. Thus, it was concluded that during the organization of work on laying asphalt concrete mixtures of connected lanes by one asphalt paver with its displacement from one lane to another, it is necessary to apply edge heating systems without fail.