Abstract
This study aimed to investigate abrasion resistance, flexural toughness and impact resistance of concrete mixes with incorporated particles of crumb rubber (CR) as a partial substituent by volume to concrete natural aggregates. Seven concrete mixes were prepared with water to cement ratio 0.4 and cement content 450 kg/m3 . One mix, with no rubber content, was considered as a reference mix to compare the designated mechanical properties of plain rubberized mixes, while the remaining six mixes contained crumb rubber as a partial replacer at levels of 10%, 20% and 30% by volume of each sand and crushed stone aggregates. Abrasion resistance was evaluated according to British standard BS 1338 and impact resistance was measured according to ACI 544.2R. It has been discovered that increasing CR replacement level led to a significant improvement in abrasion resistance, flexural toughness, and impact resistance (number of blows that cause failure cracking). Abrasion lengths decreased by 3.0 - 20.6%, while flexural toughness and impact resistance increased by 8.2 - 39.4% and 18.7 - 365.4% respectively with increasing crumb rubber replacement level.
Highlights
The disposal of waste tires is a significant environmental problem around the world
The results show that compressive strength of the control mix, with no contained crumb rubber, was 44.13 MPa at the age of 28 days of concrete
For rubberized concrete mixes with fine crumb rubber as a partial replacer to fine aggregates, it was found that compressive strengths, decreased to 37.75 MPa, 35.17 MPa and 31.53 MPa at replacement levels 10%, 20% and 30% respectively
Summary
The disposal of waste tires is a significant environmental problem around the world. Billions of waste tires are annually manufactured around the world[28; 30]. It had been estimated that, by the end of every year, about 500 millions of tires would be regularly discarded to garbage or landfills without any kind of treatment. This number is predicted to reach 1200 million annually by the end of year 2030. Stockpiled tires have significant impact on health and environment through water, air and soils pollution. These tires keep the water for long period due to its impermeable nature that provides breeding for pests and mosquitoes[12; 6; 20]. Burning of scraped tires is the cheapest and easiest way for disposal, which causes fire
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