Evaluation of the performance of eco-friendly concrete using waste tire rubber

This article investigates how to improve some properties of concrete by using rubber tyres, resulting in environmentally friendly concrete and better performance with a reduced risk of waste tyres. Therefore, study effects of tyres rubber on the mechanical and physical properties of concrete, experimentally, rubber aggregate was used to substitute fine or coarse aggregate, in different proportions ranging from 10 to 25%, with an increase of 5% for each. The properties of the produced concrete, including thermal insulation and mechanical strength, were experimentally evaluated. The results of both procedures, replacement of fine and coarse aggregates, were then compared to determine the best substitution. The results of this study indicated the rubber concrete could deform but not split when chipped rubber aggregate is used. Also, crumbed use has a higher isolation performance than other sizes due to its better void filling ability. Furthermore, replacing fine aggregates reduces conductivity by 32.76% less than the control mix, and adding chipped rubber (25%) decreased the density by 6%. On the other hand, adding rubber to concrete negatively influenced the workability, compressive strength, flexural. In addition, microstructure images showed a lack of bonding between the rubber and the cement matrix. Generally, it could be concluded from the results that recycling waste tyres rubber in concrete could significantly enhance the eco-friendliness of the concrete and enhance some key properties of concrete, such as the thermal insulation, but it limits the application of concrete in heavily loaded areas. Generally, the reduction in density and thermal conductivity is a good advantage for many applications.