杨木纤维对砂浆流动度、力学性能和自收缩的影响

Effect of Poplar Fiber on Flowability, Mechanical Property and Auto-Shrinkage of Mortar

本文采用控制变量法设计试验,探究了杨木纤维尺寸、体积分数对砂浆流动度、力学性能(抗压、抗折强度)及自收缩的影响。研究发现:与杨木纤维尺寸相比,杨木纤维体积分数对砂浆流动度的影响更为显著,当杨木纤维体积分数自1.0%增至3.0%时,砂浆流动度降低49.56%;增加杨木纤维尺寸和体积分数均会降低砂浆的抗折强度,而增加杨木纤维的体积分数有利于提高砂浆的抗压强度;杨木纤维体积分数比其尺寸对砂浆的减缩作用更显著,添加3.0%长度为0.30~1.25 mm的杨木纤维使砂浆72 h自收缩降低45.6%。

The effects of size and volume fraction of poplar fiber on flowability,mechanical properties(compressive strength,flexural strength),and auto-shrinkage of mortar were studied by using control variable method.The results indicate that the volume fraction of poplar fiber has a more significant effect on flowability of mortar than its size.When the volume fraction of poplar fiber increases from 1.0%to 3.0%,the flowability of mortar decreases by 49.56%.Increasing the size and volume fraction of poplar fiber reduce the flexural strength of mortar,while increasing the volume fraction of poplar fiber is conducive to improving the compressive strength of mortar.The volume fraction of poplar fiber is more significant than its size on the effect of reducing shrinkage of mortar,and the addition of 3.0%poplar fiber of 0.30~1.25 mm reduces the auto-shrinkage of mortar by 45.6%at 72 h.