Waste tire rubber can replace the coarse rocky material making up the bulk of concrete, using up some of the about a billion scrap tires produced annually. Reducing the need for natural materials like rocks that are mined will also lower costs. A wet mixture of sand, gravel, and waste rubber is put in molds and compressed to remove all the pores in the drying concrete. The resultant strong concrete is lightweight, reducing the transportation cost, and as a precast concrete member, decreasing construction time and saving labor costs.
Source: Mohammad Momeen Ul Islam et al. Design and strength optimization method for the production of structural lightweight concrete: An experimental investigation for the complete replacement of conventional coarse aggregates by waste rubber particles. Resources, Conservation and Recycling, 2022.
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