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Possibility of using different types of Egyptian serpentine as fine and coarse aggregates for concrete production
Materials and Structures ( IF 3.8 ) Pub Date : 2020-07-08 , DOI: 10.1617/s11527-020-01525-5
M. A. Masoud , Alaa M. Rashad , K. Sakr , M. G. Shahien , A. M. Zayed

This work is the first attempt to study the possibility of incorporating three different types of Egyptian serpentine aggregates (antigorite, lizardite and chrysotile) with different serpentinization grades as fine and coarse aggregates for normal concrete production. The results of physical and mechanical tests for each type of aggregate were compared to the others. In addition, the effect of serpentinization grade on their mineralogical composition, physico-mechanical and morphological properties of was evaluated and compared. The results were analyzed by using sophisticated tools such as X-ray diffraction, thermogravimetry/differential thermogravimetry and scanning electron microscopy. The results revealed that the physical, mechanical and microstructural properties of serpentine-based concretes were negatively influenced by the progress of serpentinization and deformation processes. The antigorite aggregate showed the lowest serpentinization grade compared to the others (i.e. lizardite and chrysotile). Thus, the antigorite-based concrete revealed better physical and mechanical properties as well as a condensed interfacial transition zone than those of lizardite- and chrysotile-based. Therefore, the results of this study indicated that antigorite is the most appropriate serpentine aggregate to be used in normal concrete production, however, more tests on the durability of such concrete are needed.

中文翻译:

可以使用不同类型的埃及蛇纹石作为混凝土生产的细骨料和粗骨料

这项工作是首次尝试研究将具有不同蛇纹石化等级的三种不同类型的埃及蛇纹石骨料(叶蛇纹石、蜥蜴石和温石棉)作为普通混凝土生产的细骨料和粗骨料的可能性。将每种类型集料的物理和机械测试结果与其他类型的集料进行比较。此外,还评估和比较了蛇纹石化等级对其矿物组成、物理机械和形态特性的影响。使用X射线衍射、热重/差示热重和扫描电子显微镜等精密工具对结果进行分析。结果表明,物理、蛇纹石基混凝土的机械和微观结构性能受到蛇纹石化和变形过程的负面影响。叶蛇纹石骨料与其他骨料(即蜥蜴石和温石棉)相比,蛇纹石化等级最低。因此,叶蛇纹石基混凝土显示出比蜥纹石和温石棉基混凝土更好的物理和机械性能以及凝聚的界面过渡区。因此,这项研究的结果表明叶蛇纹石是最适合用于普通混凝土生产的蛇纹石骨料,但是,需要对此类混凝土的耐久性进行更多测试。与蛇纹石和温石棉基混凝土相比,叶蛇纹石基混凝土具有更好的物理和机械性能以及凝聚的界面过渡区。因此,这项研究的结果表明叶蛇纹石是最适合用于普通混凝土生产的蛇纹石骨料,但是,需要对此类混凝土的耐久性进行更多测试。与蛇纹石和温石棉基混凝土相比,叶蛇纹石基混凝土具有更好的物理和机械性能以及凝聚的界面过渡区。因此,这项研究的结果表明叶蛇纹石是最适合用于普通混凝土生产的蛇纹石骨料,但是,需要对此类混凝土的耐久性进行更多测试。
更新日期:2020-07-08
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