Abstract
The current global waste tyre generation far exceeds its consumption in terms of recycling and re-use. The traditional recycling and re-use methods like thermal incineration have proven ineffective, costly and in some cases environmentally unsustainable. Particularly, in developing countries where some of the sophisticated techniques required to process tyres to allow them to be utilised are either too costly or have not yet been developed. The situation has resulted in accumulation of large waste tyre stockpiles that pose health and safety risks. To combat the problem, the use of waste tyre rubber in concrete construction has been proposed. Several studies have been conducted to assess the effects of the inclusion of waste tyre rubber in its different forms (fibres, particles), for concrete production and the results are promising. Although there are some apparent demerits to the inclusion of tyre rubber in concrete, the potential benefits seem to overshadow the negatives. This paper reviews published research on the scientific and technical viability of using waste tyre rubber in concrete production. It discusses the production and properties of waste tyre particles. It highlights advances made with regards to the incorporation of tyre rubber material in concrete, focusing on the engineering properties of the tyre rubber modified concrete. In conclusion, recommendations for future research and possible application for the material will be discussed.
Highlights
Concrete is one of the most extensively used construction material in the world and the natural mineral aggregates used to make the concrete are a finite resource, which is fast dwindling
Natural mineral aggregates constitute about 70 % of concrete
This paper presents a review into the viability of using waste tyre rubber in concrete based on evidence gathered from published literature
Summary
Concrete is one of the most extensively used construction material in the world and the natural mineral aggregates used to make the concrete are a finite resource, which is fast dwindling. The production of natural aggregates has a huge impact on atmospheric, water and natural environment Some of these effects span beyond the life of the quarry as the rehabilitation of the land is not always completely successful [1, 2]. The Recycling and Economic Development Initiative of South Africa (REDISA) waste management plan has been put in place to ensure that tyres are being put to useful applications instead of dumping them in landfills [13]. These applications include the shredding of waste tyre to make playground mats, turfs and asphalt concrete. The aim is to provide a bird eye’s view of the possibility of a concrete with waste tyre rubber as an aggregate
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