Abstract

Motivated by the tremendous trend toward green environment and to reduce the effect of scrap tires on the environment and human health, this research is an attempt to find a practical and environmentally sound solution of the problem of scrap tires by developing a light weight with low thermal conductivity composite construction materials using waste tires. A few literatures may be found about the effect of crumb rubber on thermal conductivity of mortar. Thus, in this research project, an experimental program was established to investigate the effect of the amount and size of crumb rubber (rubber obtained from recycling scrap tires) on the thermal properties of mortar. Four levels of crumb rubber addition: 10, 20, 30 and 40% and three sizes of crumb rubber (#30, #10_20 and a combination of both sizes) were considered to make twelve different mixtures of the rubberized mortar. Specially designed and constructed heat transfer measurement device was used to measure thermal conductivity of the specimens. Results were used to determine the optimal amount of crumb rubber that gives the least thermal conductivity, which directly related to the improvement in thermal resistance of concrete mixtures. It was found that the size and the amount of crumb rubber had an effect on thermal properties of the specimens investigated. The thermal conductivity of rubberized mortar was decreased by 28% when crumb rubber #10_20 was used. It was also found that #10_20 crumb rubber had more effect on the thermal conductivity reduction than #30 crumb rubbers. An empirical equation is proposed to predict thermal conductivity of rubberized mortar.

Highlights

  • Very little raw chemical precursor material can be reclaimed for reuse from waste tires, researchers all over the world are constantly trying to find innovative methods to re-use them in different applications such as: Use of tire rubber in asphaltic concrete mixtures; incineration of tires for the production of steam; reuse of ground tire rubber in various plastic and rubber products; fuel for cement kiln, feedstock for making carbon black and as artificial reefs in marine environment

  • Their study compares the rheological properties of Biomodified Rubber (BMR) with a Crumb Rubber-Modified (CRM) binder commonly being used in the United States

  • All mixtures of rubberized cement mortar exhibited a lower unit weight compared to the plain cement mortar which indicates that lightweight construction materials can be obtained by incorporating waste tire materials into mix ingredients

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Summary

Introduction

Previous investigations on the re-use of tire rubber in cement-based materials focus on the use of crumb rubber as an aggregate in concrete and evaluate only its mechanical properties. Benazzouk et al (2007) have investigated the effect of powdered tire rubber as addition to cement paste on both the physicomechanical and water absorption properties. They concluded that the composite satisfies the basic requirement of construction materials and could be used for load-bearing wall. The incorporation of rubber particles in cementitious matrix tends to restrict water absorption of the composite

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