Comparative analysis of standard indicators for nanocarbon asphalt concrete and other asphalt concretes

Abstract

A comparative analysis of the standard indicators for a nanoasphalt concrete of the type B prepared with the use of a nanocarbon powder and the asphalt concretes of the type B and stone mastic asphalt concretes (SMA20) with modifiers and without them has been performed in the work. The bitumens of the grades BND 70/100, BND 100/130 and BND 130/200 have been used for preparing of the asphalt concretes. The bitumens of the grades BND 70/100 and BND 100/130 have been produced by the Pavlodar petrochemical plant, and the bitumen of the grade BND 130/200 has been manufactured by compounding of the bitumen of the grade BND 100/130 and the petroleum tar of the same plant in Kazakhstan Highway Research Institute. A nanopowder (150-200 nm) has been manufactured from a coal rock of the deposit “Saryadyr” of the “Corpoation “ON-Olzha” LLP (Akmola region) by three-stage size reduction sequentially in a mechanical dispergator (up to 2-3 mm), an aerodynamic mill (up to 20 mcm) and a reactor with a rotating electromagnetic field (150-200 nm). To compare the standard indicators of 13 types of asphalt concretes have been prepared. The standard indicators of the asphalt concretes have been determined in a laboratory under the standard ST RK 1218-2003. The comparative analysis has been performed under the following 6 main standard indicators: a compression strength at the temperature of 50 ºС;a compression strength at the temperature of 20 ºС;a compression strength at the temperature of 0 ºС;the shear resistance (atfriction at the temperature of50 ºС);the crack resistance at the temperature of0 ºС; the water saturation. It is found out that thenanoasphalt concrete under the considered standard indicators can substitute practically all the main types of the asphalt concretes used in a road construction in many countries of the world and in Kazakhstan. It has essentially high resistance to the shear, low temperature and fatigue failures, cyclic freezing and thawing.