Abstract
In the past few decades, due to the exponential increase of the world’s population, the number of discarded waste tires has become a serious ecological and environmental problem. Decomposition of waste tire rubber can take longer than 50 years, and every year the number of discarded tires is rapidly growing. With the inclusion of waste tire rubber into self-compacting concrete this global problem can be reduced. Waste tire rubber can be incorporated in self-compacting concrete by partially replacing the natural fine and coarse aggregate, reducing consumption of sand and gravel and preserving these natural materials. In addition, recycling and reusing waste tire rubber avoids the need for tire landfilling, as one of the major ecological problem of the near future. Replacement of natural aggregate with waste tire rubber can have an undesirable influence on the mechanical properties of self-compacting concrete, i.e., compressive strength, flexural strength, splitting tensile strength, and modulus of elasticity, however. On the other hand, replacing natural gravel or sand with waste tire rubber can improve impact resistance, ductility, and fatigue resistance. This paper presents an overview of the literature investigating recycled waste tire rubber used as a fine and/or coarse aggregate replacement in self-compacting concrete and its influence on several essential fresh and hardened self-compacting concrete properties.
Highlights
The number of unusable waste tires from different kinds of vehicles is rapidly growing and is turning out as one of the major ecological and environmental problems of the present day
The results showed a reduction in fracture energy by 10.91%, 13.03%, 18.55%, 24.01% and 28.05% when fine aggregate was replaced with 5%, 10%, 15%, 20% and 25% crumb rubber by volume, respectively
Waste tire rubber can be used as a replacement aggregate material in self-compacting concrete
Summary
The number of unusable waste tires from different kinds of vehicles is rapidly growing and is turning out as one of the major ecological and environmental problems of the present day. One-billion waste tires are discarded each year [1], and are predicted to be almost 1.2 billion per year by. 8.3 million tons of waste tires are discarded per year just in Europe and United States of America (USA) [3], some of which were probably disposed illegally, compromising human health as the aesthetics of nature. Thanks to different types of associations across the world that promote a circular economy and sustainable development, recycling of waste tires and reuse of tire derived rubber has become very popular in the last few years. Recycling of waste vehicle tires has become very popular topic among scientists and engineers
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