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首页> 外文期刊>Magazine of Concrete Research >Experimental investigation of crack propagation and post-cracking behaviour in macrosynthetic fibre reinforced concrete
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Experimental investigation of crack propagation and post-cracking behaviour in macrosynthetic fibre reinforced concrete

机译：合成纤维增强混凝土的裂纹扩展和开裂后行为的试验研究

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摘要

An experimental investigation on the fracture test response of notched concrete beams with two types of discrete macrosynthetic fibres is presented. The influence of high-modulus polypropylene macro fibres on crack propagation and opening was evaluated using the digital image correlation technique. The surface displacements measured close to the tip of the notch were analysed to evaluate the crack opening profile in concrete in relation to the observed load response. A method for precisely estimating the displacement discontinuity across the crack from measured surface displacements was developed. Post-peak softening in the flexural load response was found to be associated with crack advance in the cementitious matrix. The measured crack opening profiles in the post-cracking response indicated a hinge-type behaviour in the beam. The physical hinge in the post-cracking flexural response of the beam was directly determined from the surface measurements. It was found that the addition of macrosynthetic fibres up to 8 kg/m(3) (0.9% by volume) did not significantly influence crack propagation but provided resistance to opening of the hinge, which resulted in an increase in toughness and significant load recovery in the post-peak flexural load response.
机译：提出了两种类型的离散合成纤维对带切口混凝土梁的断裂试验响应的实验研究。使用数字图像相关技术评估了高模量聚丙烯大纤维对裂纹扩展和开裂的影响。分析了靠近缺口尖端测得的表面位移，以评估混凝土中的裂缝开口轮廓与观察到的载荷响应的关系。开发了一种从测量的表面位移中精确估算出整个裂纹位移不连续性的方法。发现弯曲载荷响应中的峰后软化与胶结基体中的裂纹扩展有关。裂纹后响应中测得的裂纹开口轮廓表明梁中的铰链型行为。光束开裂后的弯曲响应中的物理铰链直接由表面测量确定。发现添加高达8 kg / m（3）（按体积计算的0.9％）的大合成纤维不会显着影响裂纹扩展，但能提供抗铰链打开的能力，从而增加了韧性并显着提高了负荷恢复率在峰后弯曲载荷响应中。

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