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Effect of steel fibres on fracture parameters of cementitious composites

机译：钢纤维对水泥基复合材料断裂参数的影响

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摘要

This study was aim to determine the influence of the type of steel fibres on fracture parameters of cementitious composites. Flexural strength test was performed on notched beams according to EN 14651. Both type of steel fibre; arched- and hooked-end-type were added 10, 30, 40, and 50 kg/m(3) as volume fractions. Steel fibres bridged the cracks during loading to fibre-reinforced cementitious composites, and prevented fracture rapidly. The load-deflection curve was depended on the shape and the quantity of the used fibres. The fracture energy absorption behaviour of arched-type steel fibre cementitious composites (ASFRC) was evaluated by applying different approach with a variety of fracture parameters such as stress intensity factor (K-IC), energy release rate (G(IC)), the unit work in destruction (J(IC)), residual flexural tensile strength (f(R,j)), equivalent flexural strength (f(eq,j)), and fracture energy (G(F)). As results, all fracture parameter was increased with fibre volume fraction up to 40 kg/m(3). And ASFRC had higher value for these values than reinforced with hooked-end-type steel fibre (HSFRC); i.e. GF of ASFRC was 1.34-2.98 times higher compared to HSFRC.
机译：这项研究旨在确定钢纤维类型对水泥基复合材料断裂参数的影响。弯曲强度测试是根据EN 14651对带切口的梁进行的。拱形和钩形末端类型以体积分数添加10、30、40和50 kg / m（3）。钢纤维在加载过程中弥合了裂缝，形成了纤维增强的水泥基复合材料，并迅速防止了断裂。载荷-挠度曲线取决于所用纤维的形状和数量。通过采用不同的断裂参数，如应力强度因子（K-IC），能量释放率（G（IC）），抗拉强度等，采用不同的方法评估了拱形钢纤维水泥复合材料（ASFRC）的断裂能吸收行为。破坏的单位功（J（IC）），残余挠曲抗拉强度（f（R，j）），等效挠曲强度（f（eq，j））和断裂能（G（F））。结果，所有断裂参数均随纤维体积分数增加至40 kg / m而增加（3）。而且ASFRC的这些值比钩端型钢纤维（HSFRC）增强的值高。即ASFRC的GF是HSFRC的1.34-2.98倍。

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