冻融循环对高温后聚丙烯纤维混凝土动弹性模量的影响

The influence of freeze-thaw cycle on the dynamic elastic modulus of polypropylene fiber concrete after high temperature

为研究因高温和冻融耦合作用而引起的聚丙纤维混凝土损伤,文章通过试验,测试了不同聚丙烯纤维掺量时,混凝土试件经受不同高温和冻融循环次数后的相对动弹性模量。试验结果表明,高温和冻融耦合作用会引起混凝土性能的严重劣化,当高温和冻融耦合作用达到一定程度时,混凝土试件发生断裂破坏;当掺量小于0.10%时,随着聚丙烯纤维掺量的增多,由于高温和冻融耦合作用而引起的相对动弹性模量损失逐渐降低,而当掺量超过0.10%时,再增加聚丙烯纤维掺量,反而会加重混凝土相对动弹性模量的损失。

To study polypropylene fiber concrete damage caused by coupling effect of high temperature and freezing and tha- wing1 in this paper, through the test, test the relative dynamic elastic modulus of concrete specimens subjected to different heat and freezing and thawing cycles under different dosage of polypropylene fiber. The test results show that the coupling effect of high temperature and freezing and thawing will cause serious deterioration of concrete performance, when the high temperature and freezing and thawing coupling effect reaches a certain degree, concrete specimen has fracture failure; When the dosage is less than 0. 10%, along with the increase in dosage of polypropylene fiber, relative dynamic elastic modulus loss due to high temperature and freezing and thawing coupling effect decreases, and when the dosage more than 0. 10% , adding polypropylene fiber content, it will increase the loss of the relative dynamic elastic modulus of concrete.