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研究了不同体积掺量、随机取向的短钢纤维和聚丙烯短纤维对水泥砂浆性能的影响。试验结果表明:加入短钢纤维的水泥砂浆在断裂发生及达到最大荷载时,J积分值随纤维掺量的增加而增加,这是由于纤维的架桥效应提升了砂浆的抗变形能力,使纤维增强砂浆比普通砂浆能够承受更大的荷载。同时,钢纤维的弹性模量远高于砂浆,能够改善纤维增强砂浆的抗压强度和弹性模量。掺入聚丙烯短纤维能够明显改善水泥砂浆的韧性和弯曲强度,但由于聚合物纤维弹性模量较低,使得砂浆的抗压强度降低。
The effects of different volume contents, random orientation of short steel fiber and polypropylene staple fiber on the properties of cement mortar were studied. The experimental results show that the integral of J increases with the increase of fiber content when the fracture occurs and reaches the maximum load, which is due to the bridging effect of fiber to enhance the anti-deformation ability of mortar, Reinforced mortar can withstand greater loads than ordinary mortar. At the same time, the elastic modulus of steel fiber is much higher than that of mortar, which can improve the compressive strength and elastic modulus of fiber reinforced mortar. The incorporation of polypropylene staple fiber can significantly improve the toughness and flexural strength of cement mortar, but due to the lower elastic modulus of the polymer fiber, so that the compressive strength of mortar decreased.