Nowadays the task of introducing long (extended) yarns, fiber or wire to the mix, while adhering to the constant quality indicators, and the ease of use is considered to be insolvable. Introducing small sized (discrete) elements to the mix can help achieve uniform distribution (dispersion) of these elements in the mix, and make a «composite» material with better physical and mechanical properties in the finished structural members.
Pilot compositions of fiber reinforced asphalt concrete mixes were selected; it was determined how the method of introducing fibers of various density and length cuts to the mix can affect the properties of the composition; the tests were conducted to simulate various modes of preparation and introducing the fiber to the composite mix.
The tests outcomes have demonstrated the effectiveness of the method of introducing premix polyacrylonitrile fiber with a mineral powder to the asphalt concrete that helps to improve physical -mechanical properties of asphalt concrete motor-road surface. In the course of testing the compositions of fiber reinforced asphalt mixes were selected and it was determined how the fibers with various densities can affect the properties of the composition; the tests were conducted to simulate various modes of preparation and introducing the fiber to the composite mix.
The main difference between the crushed stone mastic asphalt (SMA) and conventional asphalt lies in its rigid frame structure which provides load transfer from the surface to the underlying layers through direct contact with separate large particles of the crushed stone mix. This method can lead to significant decrease in road rutting. SMA is a distinct kind of asphalt that ensures, unlike other types of mixes, resistance to water penetration, shear rigidity and coarseness of the upper surface layer.
Sergey Andronov, C. Sc., Associate Professor;
Alexey Zadiraka postgraduate;
Saratov State Technical University after Yuri Gagarin,Saratov, Russia