Performance Evaluation of Stone Mastic Asphalt and Hot Mix Asphalt Mixtures Containing Recycled Concrete Aggregate

Mohammad Saeed Pourtahmasb,Mohamed Rehan Karim

doi:10.1155/2014/863148

Mohammad Saeed Pourtahmasb, Mohamed Rehan Karim

Open Access

https://doi.org/10.1155/2014/863148

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Abstract

Environmental and economic considerations have encouraged civil engineers to find ways to reuse recycled materials in new constructions. The current paper presents an experimental research on the possibility of utilizing recycled concrete aggregates (RCA) in stone mastic asphalt (SMA) and hot mix asphalt (HMA) mixtures. Three categories of RCA in various percentages were mixed with virgin granite aggregates to produce SMA and HMA specimens. The obtained results indicated that, regardless of the RCA particular sizes, the use of RCA to replace virgin aggregates increased the needed binder content in the asphalt mixtures. Moreover, it was found that even though the volumetric and mechanical properties of the asphalt mixtures are highly affected by the sizes and percentages of the RCA but, based on the demands of the project and traffic volume, utilizing specific amounts of RCA in both types of mixtures could easily satisfy the standard requirements.

Highlights

In recent years, many studies have been carried out on the use of construction and demolition (C&D) wastes in developed countries
Test results indicated that the density values of stone mastic asphalt (SMA) and hot mix asphalt (HMA) mixtures decreased with increasing recycled concrete aggregates (RCA) content due to the lower specific gravity and density of RCA, except 20 and 40% FRCA-SMA in which density values slightly increased
This paper has presented some of the experimental results obtained from the influence of recycled concrete aggregate

Summary

Introduction

Many studies have been carried out on the use of construction and demolition (C&D) wastes in developed countries. The most considerable interest is the reuse of waste materials in new construction sectors. It is the intention of scientists and researchers, as well as people in authority, to explore waste material recycling for environmental and economic advantages and the possibility of solid waste reuse in road construction [1]. Reusing waste material is one of the many ways to solve the problem of excess solid waste materials in industrial and urban areas. It can make significant contributions to the environment and the economy, such as (1) reducing the overuse of natural resources and saving them from exhaustion, (2) reducing the environmental pollution levels from waste materials generated in urban and industrial areas, and (3) contributing to savings in energy and money. In order to reduce their negative impacts on the environment, it is logical to reuse these waste materials in engineering and industrial applications [2]

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