Abstract
Rubberized concrete is an environmentally friendly building material that mixes rubber particles from old automobile tires into normal concrete in place of fine aggregate. The addition of rubber particles can improve the abrasion resistance of normal concrete observably. It has a good application prospect in hydraulic engineering, especially in the concrete building parts with high abrasion resistance. However, there are few experimental studies on the abrasion resistance of rubberized concrete, and the influence law and mechanism of rubber particles on the abrasion resistance of concrete are not understood. In this paper, the abrasion resistance of rubberized concrete is studied using the underwater-steel-ball method. The results show that rubber particles increase the slump of concrete mixtures. The abrasion resistance of rubberized concrete increases significantly with increasing rubber particle content, whereas the compressive strength decreases linearly. For the same rubber particle size and content, the abrasion resistance of rubberized concrete positively correlates with compressive strength and larger rubber particles significantly improve the abrasion resistance. Rubber particle content is the factor that most strongly affects abrasion resistance of rubberized concrete, followed by the compressive strength. Rubber particle pretreatment methods of NaOH + KH570 can significantly improve the abrasion resistance of rubberized concrete.
Highlights
The storage of water in dams can provide sustainable water resources for people’s production and life, and reduce the harm of floods (Basheer, 2021; Yang et al, 2021)
The results show that the abrasion resistance of concrete initially increases with increasing rubber particles (RPs) content to a maximum at 15% and decreases
For RP content = 15%, the slump of the rubberized concrete (RC) mixture increases by 13.3% (1–3 mm) and 9.3% (3–5 mm) compared with reference concrete
Summary
The storage of water in dams can provide sustainable water resources for people’s production and life, and reduce the harm of floods (Basheer, 2021; Yang et al, 2021). The RPs are made from automobile tires and their surfaces are rich in carbon powder and zinc stearate, which are necessary additives in automobile tire production These additives cause RPs to be strongly hydrophobic, which results in a poor bonding quality between the RPs and cement stone, increases the number of pores, and reduces the strength of concrete. Thomas et al, (2016a, 2016b) applied a 600-N load on a 100 × 100 × 100 mm cubic RC specimen and performed grinding tests on the specimen surface Their results show that the abrasion depth of concrete decreases with increasing RP content. The main performance aspects are that (1) concrete shows improved abrasion resistance with high RP content and (2) the abrasion resistance of RC is better than that of silicon powder concrete with higher strength.
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