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Experimental results on the shear behaviour of steel fibre self-compacting concrete (SFSCC) beams

机译:钢纤维自密实混凝土梁抗剪性能的试验结果

摘要

This paper presents an experimental test program that was carried out to investigate the shear performance of steel fibre self-compacting concrete (SFSCC) beams. In this paper, the mechanical performance of results from all mixtures used to cast normal concrete (NC), self-compacting concrete (SCC) and steel fibre self-compacting concrete (SFSCC) were also investigated. In total, 27 cubes, 9 cylinders, 9 prisms and 9 beams were prepared for the assessment of mechanical properties of three different mixtures. Four beams (125 mm × 250 mm × 2200 mm) were tested and cast using three different concrete mixtures, having two different spacing of stirrups as a result of 50% reduction of the stirrups amount. Three beams with different mixtures having similar stirrups spacing 125mm while the fourth beam with SFSCC mixes having 250mm stirrups spacing. The results show that the mechanical properties were positively affected with steel fibres inclusion. The addition of steel fibres showed an increment up to 40% in the shear load capacity for B-SFSCC125 compared to B-NC125 and B-SCC125. In addition, the crack pattern of B-SFSCC was found better than B-NC and B-SCC.
机译:本文提出了一个实验测试程序,以研究钢纤维自密实混凝土(SFSCC)梁的抗剪性能。本文还研究了用于浇铸普通混凝土(NC),自密实混凝土(SCC)和钢纤维自密实混凝土(SFSCC)的所有混合物的力学性能。总共准备了27个立方体,9个圆柱体,9个棱镜和9个横梁,用于评估三种不同混合物的机械性能。测试了四根梁(125 mm×250 mm×2200 mm),并使用三种不同的混凝土混合物浇铸,由于箍筋数量减少了50%,因此具有两种不同的箍筋间距。具有不同混合物的三根梁具有相似的箍筋间距125mm,而具有SFSCC的第四根梁具有250mm箍筋间距。结果表明,钢纤维夹杂物对力学性能有积极影响。与B-NC125和B-SCC125相比,钢纤维的添加显示B-SFSCC125的剪切载荷能力最多增加40%。另外,发现B-SFSCC的裂纹模式优于B-NC和B-SCC。

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