PERFORMANCE EVALUATION OF PRE-VULCANIZED LIQUID NATURAL RUBBER (PVLNR) IN HOT MIX ASPHALTIC CONCRETE

Abstract

Liquid natural rubber as an asphalt modification material to replace polymer, to improve the rheology of asphalt, increase resilient modulus mix, increase the resistance of high-temperature mixtures but remain flexible at low temperatures. Pre-Vulcanized Liquid Natural Rubber (PVLNR) modification of conventional liquid natural rubber is used explicitly as an asphalt modification material. With the limited research on the use of PVLNR, it is necessary to test for the performance analysis of PVLNR modified asphalt. This study aims to analyze the effect of adding PVLNR modified asphalt on asphalt rheology and mix performance. This laboratory-scale experimental research includes rheology testing of modified asphalt, mix performance in marshal testing, and resilient modulus. Based on the test results, the addition of PVLNR 3%, 5%, and 7% (of the asphalt weight) could decrease the penetration value, increase the viscosity and melting point, and provide a better elastic recovery of 55%, 57%, and 60%. Volumetric parameter analysis, such as density PVLNR modified Hot Mix Asphalt (HMA), tends to be equivalent to the HMA control mixture. Resilient modulus in samples using gyratory compactor increased with an increasing percentage of PVLNR At a temperature test of 41 oC, the resilient modulus of PVLNR modified HMA was higher with a ratio of 1.7, 1.8, 2.2 compared to the HMA control. PVLNR can substitute asphalt to save asphalt consumption by 0.17%, 0.28%, and 0.39%, respectively, of the asphalt weight.