INFLUENCE OF STEEL FIBRES OF CRIMPED AND HOOKED-END SHAPE ON THE MECHANICAL PROPERTIES OF PORTLAND CEMENT

Journal of Engineering and Sustainable Development Pub Date : 2024-05-01 DOI:10.31272/jeasd.28.3.8

Nada Hamad Khalaf, Saheb M. Mahdi, Yasir Khalil Ibrahim

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Abstract

Cement mortar without fibers might crack due to shrinkage or volume changes. Cracking in cement mortar leads to elastic deformation. The development of these cracks causes elastic deformation of cement mortar. This study examined the influence of two steel fibers' geometrical forms (crimped and hooked with just one end) in different amounts by volume (Volume fraction = 0.25%, 0.5%, and 0.75%) on the cement mortar's mechanical features. Among the characteristics were splitting, compressive as well as flexural strength. The samples were prepared, poured into cubic molds for compressive strength testing cylindrical molds used for splitting strength testing, and prismatic molds for flexural strength testing, and processed at various times 3, 14, and 28 days before the tests. According to the findings, the highest increase was obtained after adding 0.75% of crimped fibers, the compressive strength increased by 13.3 %21.29%, and 44.8%, for 3,14.28 days respectively, and split tensile strength increased by 66.17%,68.9%, and 79.48% for 3.14 and 28 days respectively and flexural strength increased by 72 %,91% and 92% for 3.14 and 28 days, respectively.

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卷曲和钩端形钢纤维对硅酸盐水泥机械性能的影响

没有纤维的水泥砂浆可能会因收缩或体积变化而开裂。水泥砂浆开裂会导致弹性变形。这些裂缝的发展会导致水泥砂浆的弹性变形。本研究考察了不同体积分数（体积分数 = 0.25%、0.5% 和 0.75%）的两种钢纤维几何形状（卷曲和单端钩状）对水泥砂浆机械特性的影响。这些特征包括劈裂强度、抗压强度和抗折强度。制备的样品被倒入用于抗压强度测试的立方体模具中，用于劈裂强度测试的圆柱形模具和用于抗折强度测试的棱柱形模具中，并在测试前 3、14 和 28 天的不同时间进行处理。结果表明，添加 0.75% 的卷曲纤维后，抗压强度在 3、14 和 28 天内分别提高了 13.3 %、21.29% 和 44.8%，劈裂拉伸强度在 3.14 和 28 天内分别提高了 66.17%、68.9% 和 79.48%，抗折强度在 3.14 和 28 天内分别提高了 72%、91% 和 92%。

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