聚丙烯纤维几何形态对水泥砂浆塑性干缩开裂性能的影响

The Influences of different Geometric Cross-sections on Cracking Properties of Cement Mortar in Plastic Shringkage

本文采用三种不同几何形态的聚丙烯纤维 ,研究了在不同体积分数情况下纤维对水泥砂浆塑性干缩开裂性能的影响。结果表明 ,除聚丙烯纤维体积分数外 ,纤维直径、纤维断面几何形态对水泥砂浆塑性干缩开裂性能也有明显影响。纤维直径减小 ,纤维水泥砂浆抗塑性干缩开裂能力增大 ;断面为三叶形聚丙烯纤维抗塑性干缩开裂能力优于圆形。

Three kinds of different geometric (cross-section) polypropylene fibers were used to investigate their effections. The test results showed that besides the fiber volume fraction, the diameter of fiber and the cross-section shape of fiber had obvious effects on the resistance of plastic shrinkage cracking. With the decreasing of fiber diameter, the plastic shrinkage cracking resistance for cement mortar increased. Three leaves shape fiber was the best cross-section shape of all three fibers for the resistance of plastic shrinkage cracking.