Investigation of low-temperature construction additives (LCAs) effects on the technical properties of asphalt binder

Decreasing the viscosity of asphalt binder is a widely applied and successful mechanism to reduce the construction temperature of asphalt mixture. Depending on this case, the waste rubber and plastic are applied to produce low-temperature construction additives (LCAs), in an attempt to reduce the construction temperature of asphalt mixture. The LCAs modified asphalt (LCAs-MA) were manufactured with different dosage of LCAs at varied temperatures, and it is to determine the manufacturing parameters such as LCAs dosages and blending temperature of LCAs-MA. After this, viscosities of LCAs-MA with various contents of LCAs were tested to investigate the LCAs and its dosage effects in the construction temperature of asphalt mixture. In addition, the physical and rheological properties of asphalt binders were studied as well, which is used to assess the technical performance of LCAs-MA. The content of LCAs-1 and LCAs-2 in the LCAs-MA should be not less than 8.6%-10% and 11.5%-13% respectively. The changing tendency of physical and rheological performance of LCAs-MA indicates that a reduction in the high-temperature performance of LCAs-MA, and a dramatic increase in its low-temperature performance. The failure temperature of asphalt at a G*sin delta Value of 5000 kPa is reduced after addition of LCAs, indicating that LCAs can improve the fatigue crack resistance of asphalt. Comparatively, the same amount of LCAs-1 has a more significant impact on the technical performance of asphalt than LCAs-2.