Mechanical Properties of Concrete with Recycled Asphalt Pavement and Silica Fume

Document Type : Research Paper

Authors

1 Department of Civil Engineering, Faculty of Civil Engineering, Architecture and Mechanics, Shahab Danesh University of Qom, Qom, Iran

2 Director of Research and Development Unit of Knowledge Base of Nano Beton Amin Concrete Co., Qom, Iran

3 Director of Quality Control at Amin Nanotechnology Co., Qom, Iran

Abstract

Recently, there has been an increasing trend toward the use of sustainable materials. Sustainability helps the environment by reducing the consumption of non-renewable natural resources. Concrete – the second most consumed material in the world after water – uses a significant amount of non-renewable resources. As a result, an experimental investigation was conducted to study the hardened properties of concrete constructed with 10% and 15% Recycled Asphalt Pavement (RAP) fine aggregate  as well as 6% silica fume. This experimental program consisted of six mix designs. The hardened properties of concrete were compared with the provisions of the international design codes (U.S., Australia, Canada, Europe, and Japan) and previous researchers’ suggested equations as well as a database of conventional concrete. Results of this study show that the RAP mixes test results fall within the 95% confidence interval of a nonlinear regression curve fit of the conventional concrete splitting tensile test database. Furthermore, application of the RAP in  mix designs, decreases the compressive strengths around 25% and splitting tensile strength up to 30%. To overcome inferior hardened properties of RAP mixes, silica fume (6%) has been added to the RAP mixes. Results of the mixes including both RAP and silica fume show comparable hardened properties (both compressive and splitting tensile strength) with conventional concrete.

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Experimental Research in Civil Engineering
Volume 3, Issue 6 - Serial Number 6
October 2017
Pages 129-142

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