Abstract
This research addresses the issue of tire waste management and natural aggregate resource depletion. It investigates use of commercially produced recycled tire rubber as replacement for fine and coarse aggregate in non-structural concrete. Two replacement levels of 10% and 20% were considered for fine aggregate with 0% or 10% of coarse aggregate. The study employed a mix proportion of 1:5:4 (cement: fine aggregate: coarse aggregate) with a water-to-cement ratio of 0.25, which is normally utilized in concrete block manufacturing in Oman. The mixes were tested for their thermal conductivity, water absorption and compressive strength. The behavior of mixes exposed to 100 and 200°C was also studied and the samples were later tested for compressive strength. The results showed improvements in compressive strength after exposure to heat. Thermal conductivity was reduced as the percentage replacement increased for both fine and coarse aggregate. During heat exposure, the temperature rise was faster in rubberized mixes, and the compressive strength of all mixes improved after the exposure to heat. Water absorption and void content increased with increase in replacement percentage. The compressive strength did not show a clear trend with the replacement and this is due to the sensitivity of the stiff mix used in the study and its inherent lean nature. The results indicate that the lean nature of the mix makes it insensitive to small replacement investigated in this research.
Highlights
Tire waste represents serious health and environmental concern in many ways
For coarse aggregate replacement (CAR)-10% mixes, thermal conductivity of fine aggregate replacements (FAR)-10% was found at 0.9692 W/mK, while it was 0.8890 W/mk for FAR-20%
Low values of thermal conductivity for mixes with tire rubber indicate that rubberized concrete has a better insulation than plain concrete and this is partly be due to the low density of rubberized concrete samples
Summary
Tire waste represents serious health and environmental concern in many ways. Waste tires from vehicles are often improperly stored and disposed in Oman by either disposal into stockpiles or illegal dumping. Concrete could be one of the possible solutions for the utilization of this tire waste and conserve the natural resources. Several studies have been conducted to investigate use of tire rubber waste in concrete. This paper shall investigate the use of tire waste rubber in non-structural concrete as fine and coarse aggregate replacements with different replacement proportions, and study physical properties of the rubberized concrete including water absorption, thermal conductivity and compressive strength. It shall verify the conformance of the rubberized concrete with the specified standards for non- structural concrete
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