Evaluation and Statistical Analysis of HRS-WC Mixture Performance Modified with Tropical Latex

Abstract

The Marshall characteristics of Hot Rolled Sheet-Wearing Course (HRS-WC) mixed with tropical latex as a substitute of the 60/70 penetration grade asphalt material were studied. The statistical analysis aiming to decide whether the tropical latex as a substitute of the 60/70 penetration grade asphalt material with levels of 1%, 3%, 5%, and 7% by weight of the asphalt would affect the Marshall performance of HRS-WC was conducted. The suggested content of the tropical latex usage in the HRS-WC mixture was analyzed. The analysis results showed that tropical latex could improve the Marshall characteristics of HRS-WC. However, the extreme percentage of tropical latex could potentially reduce HRS-WC stability. Statistically by analysis of variance (ANOVA), under 5% confidence level, latex utilization as substitution of the 60/70 penetration grade asphalt material with contents of 1%, 3%, 5%, and 7% only affected the flow parameter of HRS-WC mixture, among others Marshall characteristics (density, VMA, VFA, VIM, stability, and Marshall Quotient). Moreover, it is suggested to consider the usage of latex content in the HRS-WC mixture between 1% to 3%, in terms of the 60/70 penetration grade asphalt material substitution.