Abstract
The large development in the consumption of rubber is observed in the recent years, which leads to an increase of the production of rubber related waste. Rubbers are not hazardous waste, but they constitute a hazard for both environment and health, in case of fire in storage sites. So, recycling appears as one of the best solutions for disposing of rubber waste.This paper presents an experimental investigation dealing with the valorisation of rubber waste, specifically rubber obtained from old shoes sole waste. The waste rubbers are used form (0/5 mm) to mixes as addition at percentage (10%, 20%, 30% and 40%) in sand concrete. The physical (workability, bulk density), mechanical (compressive and flexural strength) and thermal properties are studied and analysed.The results indicate that the incorporation of rubber waste particles in sand concrete contributes to increase the workability and reduce the bulk density of all studied sand concrete. The obtained results show that mechanical performance (compressive and flexural strength) decreases when the rubber content increases. Nevertheless, the presence of rubber aggregate leads to a significant reduction in thermal conductivity, which improves the thermal insulation performances of sand concrete. This study insures that reusing of recycled rubber waste in sand concrete gives a positive approach to reduce the cost of materials and solve some environmental problems.
Highlights
The fraction of rubber waste in household wastes is large and increases with time
The use of rubber waste as addition in sand concrete contributes to increase the slump of sand concrete, probably due to the presence of more free water in the mixes containing rubber than in the concrete mix containing natural aggregate since, unlike natural aggregate, rubber aggregate has a lower absorption coefficient than dune sand, which is in concordance with the results of Guendouz et al (2016)
This paper has presented the recycling and the use of rubber wastes as aggregate in sand concrete produced either from dune sand (DS)
Summary
The fraction of rubber waste in household wastes is large and increases with time. In each country the waste composition is different, since it is affected by socioeconomic characteristics, consumption patterns and waste management programs, but generally the level of rubber in waste composition is high. Eldin et al (1993) conducted experiments to examine the strength and toughness properties of rubberised concrete mixtures They used two types of tyre rubber, with different tyre rubber content. Their results indicated approximately 85% reduction in compressive strength, whereas the splitting tensile strength reduced by about 50% when the coarse aggregate was fully replaced by chipped tyre rubber. Khatib et al (1999) studied the influence of adding two kinds of rubber, crumb (very fine to be replaced for sand) and chipped (at the size of 10–50 mm to be replaced for gravel). They made three groups of concrete mixtures. The influence of the proportion of rubber waste used on properties of the new material has been studied and analyzed
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