Influence of Styrene Butadiene Styrene on Hot Mix Asphalt Moisture Damage Resistance

Moisture damage of asphalt concrete is defined as the loss of strength and stability caused by the active presence of moisture. The most common technique to mitigate moisture damage is using modifiers with the asphalt cement and the aggregate. Various additives and modifiers are used to enhance the performance of asphalt mixtures. However, some of these additives/modifiers may affect the moisture susceptibility of hot mix asphalt. The objective of this study was to investigate the influence of Styrene –Butadiene - Styrene (SBS )on the moisture sensitivity of modified asphalt mixtures . The seven SBS percentages were selected (0.5, 1.0, 1.5, 2.0, 2.5, 3.0 and 3.5) % by the weight of asphalt. The laboratory tests includes: Marshall Test, indirect tensile strength test, and the index of retained strength test. The test results have exhibited that, the asphalt mixtures modified by SBS have shown improvement of Marshall properties, and increasing the moisture damage resistance. The modified hot mix asphalt contain 2.5% SBS by the weight of asphalt has good Marshall properties and moisture damage resistance.