Using Crump Rubber (CR) of Scrap Tire in Hot Mix Asphalt Design

Omar Asad Ahmad

doi:10.3844/ajassp.2017.274.285

Abstract

Hot Mix Asphalt (HMA) design is one of the most important types of pavement used in highway construction. This research provided a hot mixture design method modifying with Crump Rubber Scrap Tire (CR) in order to develop and determining the optimum additive for hot mix asphalt design. All tests conducted to the raw material including specific gravity, compact test and absorption content to ensuring its quality. In this research, hot mix designed as a stander without any additives and with (4.5, 5, 5.5, 6, 6.5 and 7%) percent of asphalt content. All specimens of each asphalt percent content were tested after 24 h, according to AASHTO. The additives in this research were prepared by two methods (wet process and dry process). The results show that in dry process all additives cause a failure and the segregation was the major reason for failure. In wet process the selected wet process at 5.5% CR by weight of binder content was optimum were its raising the stability value to 65% of original stability in standard mix, which lead to decreasing the rutting effects.

Highlights

Asphalt pavements are designed to resist rutting, fatigue cracking, low temperature cracking and other pavement distresses
To minimize the structural damage of asphalt pavement and increase the durability of the pavement, the asphalt binder needs to be improved with regards to performance properties such as resistance against rutting and fatigue cracking (Cooley Jr et al, 2003; Martin et al, 2003)
The properties of sample such as, Must be improved and any losses in quality in standard mix after adding rubber leading to reject the method, where the results reported in Tables 8, 10, 11, 13 and 14

Summary

Introduction

Asphalt pavements are designed to resist rutting, fatigue cracking, low temperature cracking and other pavement distresses. The rutting deformation occurs at high temperature and fatigue cracking which occurs at intermediate and low temperatures. These stresses reduce the design life of the pavement and increase the maintenance costs. This is due to the rapid growth of traffic volume and vehicle loads which led to unsatisfactory performance of asphalt binders (Cooley Jr et al, 2003). To minimize the structural damage of asphalt pavement and increase the durability of the pavement, the asphalt binder needs to be improved with regards to performance properties such as resistance against rutting and fatigue cracking (Cooley Jr et al, 2003; Martin et al, 2003)

Objectives

Methods

Results

Conclusion