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首页> 外文期刊>Construction and Building Materials >Effect of partial and total replacement of siliceous river sand with limestone crushed sand on the durability of mortars exposed to chemical solutions
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Effect of partial and total replacement of siliceous river sand with limestone crushed sand on the durability of mortars exposed to chemical solutions

机译：用石灰石碎砂部分和全部替代硅质河砂对接触化学溶液的砂浆耐久性的影响

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This study presents a part of different works carried out on a context of local materials valorization and industrial wastes reuse. The main objective of this investigation is to substitute silica river sand (M'zi river) by crushed limestone sand (residues quarries) in the mortar, so as to valorize the crushed limestone sands that are found (in waste form) in large quantities in the region of Laghouat (Algeria), to protect the environment against this waste and to unlock the local construction projects, especially after the ban on local sand extraction from river for environmental reasons. Indeed, the aim of this work is to study the effect of this replacement on the durability of mortar exposed to different chemical environments. In fact, we have to study the behavior of the obtained mortars into three different environments: in open air, in a solution containing lime and in another one containing hydrochloric acid (HCl). For replacement 0%, 50% and 100%, the results showed that, compared to open air environment, conservation in a lime solution has a positive effect on the durability of mortars. In fact, it furthermore improves their physical and mechanical properties such as the mechanical strength, the dimensional variations, etc. In addition, and compared to silica sand, it has been noted that these properties were much higher in the presence of crushed limestone sand in mortar. Concerning the HCl-solution, it has been recorded a negative effect on the durability of mortars. But, it should be noted that this effect was considerably reduced in the presence of crushed limestone sand in the materials. Finally, with introduction of limestone sand in mortar, the improvements were higher: decrease in the permeability, reduction in the mass and strength losses, reduce in the phenomenon of capillary rise and less attack by acid.
机译：这项研究提出了在当地材料评估和工业废物再利用的背景下开展的不同工作的一部分。这项研究的主要目的是用砂浆中的碎石灰石砂（残渣采石场）代替二氧化硅河砂（M'zi河），以对在（废料中）大量发现的碎石灰石砂进行估价。拉古瓦特（阿尔及利亚）地区，以保护环境免遭这种浪费并解锁当地的建设项目，尤其是在出于环境原因而禁止从河流中提取当地沙土之后。确实，这项工作的目的是研究这种替代方法对暴露于不同化学环境的砂浆的耐久性的影响。实际上，我们必须研究所得砂浆在三种不同环境中的行为：在露天，含石灰的溶液中以及在另一种含盐酸（HCl）的溶液中。结果表明，对于0％，50％和100％的替代品，与露天环境相比，石灰溶液中的养护对砂浆的耐久性有积极的影响。实际上，它进一步改善了它们的物理和机械性能，例如机械强度，尺寸变化等。此外，与硅砂相比，已经注意到，在存在碎石灰石砂的情况下，这些性能要高得多。砂浆。关于HCl溶液，已证明对砂浆的耐久性有负面影响。但是，应该注意的是，在材料中存在碎石灰砂的情况下，这种影响已大大降低。最后，通过在砂浆中引入石灰石砂，改善程度更高：渗透率降低，质量和强度损失降低，毛细管上升现象减少，酸侵蚀减少。

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