EXPERIMENTAL STUDYING THE EFFECT OF ADDING STYRENE BUTADIENE STYRENE POLYMER (SBS) ON THE MECHANICAL PROPERTIES OF HOT MIXTURE ASPHALT

Abstract

The objective of this research is to study the effect of adding Styrene Butadiene Styrene polymer SBS as a modifier on the mechanical properties of asphalt binder and hot mixtures asphalt (HMA) and to compare between the properties of the modified and unmodified asphalt binder and hot mix asphalt (HMA) which is used in the rehabilitation of Baghdad province and Al-Basra province highway by paving the surface course of the highway for areas suffers from problems such as rutting and cracks. There are two stages that were used in the laboratory tests on asphalt binder and hot mix asphalt (HMA). The first stage is used laboratory tests without using SBS polymer with asphalt and the second stage is used SBS Polymer with asphalt as an additive material. The results of asphalt binder tests show that the use of SBS Polymer with asphalt binder leads to improving the mechanical properties of the asphalt binder. According to the penetration test, the grade of asphalt is decreased from 61 and 62 to 39. The flashpoint, ductility, and viscosity are increased and the solubility is decreased. The results of the hot mix asphalt test show that the addition of SBS polymer leads to improving the mechanical properties of modified hot mix asphalt. Therefore, the Marshall stability for modified hot mixtures asphalt is increased for all samples. Therefore, the resistance to plastic flow and the load-carrying capacity is improved ...