ASPHALT CONCRETE SEGREGATION PREVENTION DURING TRANSPORTATION OVER LONG DISTANCES

Abstract

The article is devoted to the search for methods to reduce the asphalt concrete mixture segregation. During long transportation, thermal and fractional asphalt concrete separation occurs, which sharply reduces the pavement layers quality. The authors were faced with the task of various asphalt concrete additives evaluating and comparing effect on the bitumen BND 60/90 mixture component. Tests were carried out to assess energy-saving additives effect ("DAD-ta", "AZOL-1007", "AMDOR") on the bitumen characteristics, as well as on the physical and mechanical properties stone-mastic asphalt mixture samples. In order to increase operating bitumen temperature range the optimal "DAD-ta" additive was chosen. Further tests were carried out on cores taken from standard stone-mastic mixture layer and a mixture with an energy-saving additive taken from a test site. Has been experimentally proved using the proposed additive, it is possible to reduce paving temperature, prevent the temperature segregation negative consequences and, consequently, increase delivery distance without losing quality.