In this study, the effect of using crumb rubber and recycled aggregates on the mechanical properties of concrete has been evaluated as areplacement of fine and coarse aggregates In order to add the admixtures and evaluate their combined effect, 20 different types of concrete mixture ratio were prepared. The results indicated that in those samples containing crumb rubber and recycled aggregates the compressive strength is reduced and adding fiber up to 0.1%. to these concrete samples can improve the compressive strength Also, the tensile strength of the samples mixed with crumb rubber and recycled aggregates were decreased, and with the addition of propylene fiber up to 0.4%. the tensile strength slightly increased Moreover by adding the crumb rubber to the samples the elasticity modulus was reduced but by adding fiber to samples about 0.1% and 0.2.% the modulus of elasticity of concrete in all samples were increased. According to the results, it can be said that using the combination of 5% of crumb rubber as a replacement of fine aggregate, and the combination of 35% of recycled aggregates as a replacement of coarse aggregate, and also by adding 0.1% polypropylene fiber in volumetric percentage of concrete along with adding 7% of micro silica as a replacement of cement led to the best effect on the mechanical properties of concrete.

在这项研究中，评估了使用碎橡胶和再生骨料对混凝土力学性能的影响，作为细骨料和粗骨料的放置。为了添加外加剂并评估它们的组合效果，制备了20种不同类型的混凝土混合比。结果表明，在那些包含生胶和再生骨料的样品中，抗压强度降低，纤维含量增加至0.1％。这些混凝土样品可以提高抗压强度。此外，混有碎橡胶和再生骨料的样品的抗拉强度降低，并且添加丙烯纤维的比例最高为0.4％。拉伸强度略有增加。此外，通过向样品中添加粒状橡胶降低了弹性模量，但向样品中添加了约0.1％和0.2的纤维。所有样品中混凝土的弹性模量％均增加。根据结果​​，可以说使用5％的粒状碎屑橡胶的组合代替细骨料，使用35％的再生碎料的组合代替粗骨料，并且还添加0.1％的聚丙烯纤维。体积百分比的混凝土，以及添加7％的微硅粉作为水泥的替代品，对混凝土的机械性能产生最佳效果。