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Valorization of marble's waste as a substitute in sand concrete

机译：大理石废料的增值替代砂混凝土

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The recovery of waste proves a solution with two impacts: the environmental impact by the reduction of pollution and the gain of the occupied space by this waste, and the economic impact by the use of these lasts in the building and in the area of public works. The present research consists in recovering a waste marble (thrown powder exposed to the different meteorological phenomena) generated by the quarry marble of Fil-fila, located at the east side of Skikda in the north-east of Algeria, and add it, as sand in the composition of sand concrete. To carry out this research, we analyzed the evolution brought by the substitution of ordinary sand by marble waste sand, with 25%, 50%, 75% and 100% on the properties in the fresh state (density, workability and air content) and in the cured state (compressive strength, tensile strength, surface hardness and sound velocity). For durability we tested water absorption by immersion and chloride penetration. The results obtained are compared with control samples of 0% of substitution rate. In order to have a good filling of the voids in the granular skeleton; we added a quantity of limestone recycled fines from the quarries and for a good workability a super-plasticizing additive. The results showed that the partial substitution modified both the fresh and the hardened characteristics of the tested concretes, the durability parameters also improved.
机译：废物的回收证明是一种具有两种影响的解决方案：减少污染对环境的影响以及该废物所占空间的增加，以及在建筑和公共工程领域中使用这些残渣产生的经济影响。 。本研究包括回收由位于阿尔及利亚东北部Skikda东侧的Fil-fila采石场大理石产生的废大理石（抛出的粉末，暴露于不同的气象现象），并将其添加为沙子在砂混凝土的组成。为了进行这项研究，我们分析了用普通大理石砂代替普通砂带来的演变，其中新鲜状态下的性能分别为25％，50％，75％和100％（密度，可加工性和空气含量），以及在固化状态下（抗压强度，拉伸强度，表面硬度和声速）。对于耐久性，我们通过浸入和氯化物渗透测试了吸水率。将获得的结果与替代率为0％的对照样品进行比较。为了很好地填充颗粒骨架中的空隙；我们从采石场中添加了一定数量的石灰石回收粉，并且为了良好的可加工性，添加了超塑化添加剂。结果表明，部分替代改变了试验混凝土的新鲜和硬化特性，耐久性参数也得到了改善。

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