STIFFNESS MODULUS OF WARM MIX ASPHALT (WMA) USING ASBUTON AND SYNTHETIC ZEOLITE ADDITIVES

Abstract

The use of asphalt modification with Asbuton semi extraction in asphalt mixtures requires a higher temperature and compaction mixture than petroleum asphalt. Synthetic Zeolite is one type of additive used to reduce the temperature of mixing and compaction of Asphalt mixture until it reaches a warm mixture condition so that it can reduce emissions from the Asphalt mixture production process and is more environmentally friendly. Warm Mix Asphalt (WMA) is a technology for making asphalt mixtures with mixing temperatures 20–40 °C below Hot Mix Asphalt (HMA) but at temperatures higher than boiling water. This study aimed to determine the stiffness modulus of WMA using asphalt modified Asbuton Semi Extraction and Aspha-min synthetic Zeolite. Asphalt mixture stiffness modulus testing uses Indirect Tensile Strength (ITS) with cyclic loading, the testing procedure refers to ASTM D4123-82. The results showed that WMA using Asphalt modified Asbuton and synthetic zeolite can be realized with mixing temperature and compaction of 30 °C lower than WMA. Stiffness modulus of WMA with asphalt pen grade using synthetic zeolite is lower than HMA, whereas WMA with Asbuton modified Asphalt produces modulus of stiffness value that is greater than HMA.