The recycling of waste tires is of paramount importance for environmental protection and for economic reasons. The number of scrapped tires in the United States has reached 550 million per year and is still rising. Even higher numbers are estimated in the European Union, reaching 1 billion tires per year. Disused tires create waste with a highly negative environmental impact. Tire disposal mainly involves highly polluting treatments (e.g. combustion processes to produce fuel oil), with only a small percentage of waste (3% to 15%) destined for less-invasive treatments such as powdering. In this article we will look at previous studies in which different amounts of waste tire powder are combined with cement concrete mixtures to provide a final product with mechanical properties suitable for engineering applications. Previous work has shown that a good compressive strength can be achieved through replacing 30% of powdered tire with crushed sand. First, as the percentage of aggregation between crumb rubber and crushed sand increases, compressive strength decreases. Second, aggregation replacement of crumb rubber and crushed sand shows a reduction in density at around 10%. Third, the modulus of elasticity depends on the percentages added: the more rubber added to concrete, the less elastic the product will be. In addition, a less tough concrete means higher strength. However, adding rubber to concrete increases the toughness.1

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橡胶/混凝土：废料的机械性能，可在混凝土中再利用轮胎衍生橡胶；回顾

废旧轮胎的回收对于环境保护和经济原因至关重要。美国每年报废轮胎的数量已达到5.5亿条，而且还在不断上升。估计欧盟的轮胎数量更高，达到每年 10 亿条轮胎。废弃的轮胎会产生对环境造成严重负面影响的废物。轮胎处理主要涉及高污染处理（例如生产燃料油的燃烧过程），只有一小部分废物（3% 至 15%）用于微创处理，例如制粉。在本文中，我们将回顾以往的研究，其中将不同量的废轮胎粉末与水泥混凝土混合物混合，以提供具有适合工程应用的机械性能的最终产品。以前的工作表明，用碎砂代替 30% 的粉状轮胎可以获得良好的抗压强度。首先，随着碎胶和碎砂之间的聚集百分比增加，抗压强度降低。其次，碎胶和碎砂的聚集替换显示密度降低约 10%。第三，弹性模量取决于添加的百分比：添加到混凝土中的橡胶越多，产品的弹性就越小。此外，韧性较差的混凝土意味着更高的强度。但是，在混凝土中添加橡胶会增加韧性。 1 碎胶和碎砂的聚集替换显示密度降低约 10%。第三，弹性模量取决于添加的百分比：添加到混凝土中的橡胶越多，产品的弹性就越小。此外，韧性较差的混凝土意味着更高的强度。但是，在混凝土中添加橡胶会增加韧性。 1 碎胶和碎砂的聚集替换显示密度降低约 10%。第三，弹性模量取决于添加的百分比：添加到混凝土中的橡胶越多，产品的弹性就越小。此外，韧性较差的混凝土意味着更高的强度。但是，在混凝土中添加橡胶会增加韧性。 1