Influence of quality indicators of the surface of mineral particles on the properties of asphalt concrete

Abstract

Increasing traffic loads are driving the demand for durable asphalt concrete. The creation of new compositions of asphalt concrete mixtures is possible by studying the structure-forming processes at the interface between the phases “surface of mineral particles-organic bindef”. The presented study makes it possible to assess the degree of influence of the specific surface area on the physical and mechanical properties of asphalt concrete. Were considered fine mineral materials with different specific surface (natural sand, quartz sand, waste molding sand). They were matched with the same size modulus. At the first stage, the structure and shape of the surfaces of the particles of mineral materials were determined. At the second stage, the physical and mechanical characteristics of three asphalt concrete compositions were determined. It has been established that a well-developed, rough surface of mineral aggregate particles in asphalt concrete can act as an effective modifying element in the composition of asphalt concrete and achieve the desired physical and mechanical characteristics. An increase in the specific surface area of the mineral aggregate particles, with the same size modulus, makes it possible to proportionally increase the strength characteristics of asphalt concrete.