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Properties of concrete containing scrap-tire rubber – an overview Abstract
Solid waste management is one of the major environmental concerns in the United States. Over 5 billion tons of non-hazardous solid waste materials are generated in USA each year. Of these, more than 270 million scrap-tires (approximately 3.6 million tons) are generated each year. In addition to this, about 300 million scrap-tires have been stockpiled. Several studies have been carried out to reuse scrap-tires in a variety of rubber and plastic products, incineration for production of electricity, or as fuel for cement kilns, as well as in asphalt concrete. Studies show that workable rubberized concrete mixtures can be made with scrap-tire rubber. This paper presents an overview of some of the research published regarding the use of scrap-tires in portland cement concrete. The benefits of using magnesium oxychloride cement as a binder for rubberized concrete mixtures are also presented. The paper details the likely uses of rubberized concrete. 1. Introduction

More than 270 million scrap-tires are produced in United States each year (Rubber Manufacturer's Association, 2000 Rubber Manufacturer's Association, 2000. Washington, DC. Rubber Manufacturer's Association, 2000). In addition to this, more than 300 million tires are currently stockpiled throughout the United States (Rubber Manufacturer's Association, 2000). These stockpiles are dangerous not only due to potential environmental threat, but also from fire hazards and provide breeding grounds for rats, mice, vermines and mosquitoes (Naik and Singh, 1991; Singh, 1993). Over the years, disposal of tires has become one of the serious problems in environments. Landfilling is becoming unacceptable because of the rapid depletion of available sites for waste disposal. For example France, which produces over 10 million scrap-tires per year, will have a dwindling supply of landfills starting from July 2002, due to a new law that forbids any new...

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