Experimental Evaluation of Untreated and Pretreated Crumb Rubber Used in Concrete

Hamad Hassan Awan,Fahid Aslam,Amir Mosavi,Hisham Alabduljabbar,Muhammad Faisal Javed,Adnan Yousaf

doi:10.3390/cryst11050558

Abstract

The present research aims at evaluating the mechanical performance of untreated and treated crumb rubber concrete (CRC). The study was also conducted to reduce the loss in mechanical properties of CRC. In this study, sand was replaced with crumb rubber (CR) with 0%, 5%, 10%, 15%, and 20% by volume. CR was treated with NaOH, lime, and common detergent for 24 h. Furthermore, water treatment was also carried out. All these treatments were done to enhance the mechanical properties of concrete that are affected by adding CR. The properties that were evaluated are compressive strength, indirect tensile strength, unit weight, ultrasonic pulse velocity, and water absorption. Compressive strength was assessed after 7 and 28 days of curing. The mechanical properties were decreased by increasing the percentage of the CR. The properties were improved after the treatment of CR. Lime treatment was found to be the best treatment of all four treatments followed by NaOH treatment and water treatment. Detergent treatment was found to be the worse treatment of all four methods of treatment. Despite increasing the strength it contributed to strength loss.

Highlights

With the rapid growth in industrialization, solid waste is increasing at an alarming rate
It has become essential for the construction industry to find and apply new technologies to reduce waste produced by the industries and incorporate it in conventional concrete [1,2,3]
This study aims at finding new, better, and cheaper methods of surface treatments of crumb rubber (CR) to recover the strength loss of concrete by adding CR

Summary

Introduction

With the rapid growth in industrialization, solid waste is increasing at an alarming rate. It has become essential for the construction industry to find and apply new technologies to reduce waste produced by the industries and incorporate it in conventional concrete [1,2,3]. CR is made by shredding tires having a size between 0.075 mm and 4.75 mm [4]. It is estimated that nearly 1 billion tires are generated every year, ending their serviceable life and out of this, about 50%, without any treatment goes to garbage or landfills. By 2030, it is estimated, there would be about

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