Thermal aging of bitumen mixtures with crushed sand

Abstract

Abstract Public roads with advanced types of coatings are mainly constructed of asphalt concrete. Along with good performance, they have some disadvantages. One of them is temperature aging. The aging process is inevitable. However, to increase the stability of bituminous mixtures, it is important to study the structure formation and aging processes of bitumen films on the surface of all components separately, including the areas of contact with crushed sand. In order to study the aging processes, the methods of studying the aging of bituminous mixtures have been critically analyzed. Considering the shortcomings of the methods available, a new method has been developed. Based on the experiments performed using this method, we studied the aging processes of bituminous mixtures at the temperature of +150° C for various periods of time. The resulting mathematical models describe the aging process based on the considered factors. The experimental results were analyzed in accordance with the theoretical concepts of the interaction of bitumen films on the surfaces of crushed sand particles of amorphous rocks. The conducted research has practical conclusions.