Effects of cup lump natural rubber as an additive on the characteristics of asphalt-rubber products

Abstract

Asphalt penetration 60/70, which is widely used for road construction in Indonesia, is the cause of road deterioration due to high traffic loads and climate changes. Therefore, the addition of polymer additives can be one of the solutions to improve the quality and service period of asphalt. The aim of this research is to study the effect of cup lump natural rubber content on the characteristics of asphalt-rubber products. The mixture of asphalt-rubber is made by melt the cup lump at 130°C, then mixed it with asphalt at 170°C. The result showed that the addition of cup lump would decreased the penetration and weight loss properties, but increased the properties such as softening point, ductility, and Marshall stability of asphalt-rubber products. The optimal addition of cup lump was at 12% with penetration 52,4 dmm, softening point 63,5°C, ductility 142 cm, weight loss 0,068%, and Marshall stability 1904,36 kg.