高强度纤维素纤维混凝土抗冻融性能试验研究  

Experiment and Research on Freeze-Thaw Resistance of High-Strength Cellulose Fiber Reinforced Concrete

作　　者：邓宗才[1] 张鹏飞[1] 刘爱军 杨明生 

机构地区：[1]北京工业大学建筑工程学院,北京市100124 [2]河北省南水北调建设管理局,石家庄市050021

出　　处：《公路》2009年第7期304-308,共5页Highway

摘　　要：冻融破坏是混凝土耐久性的重要病害之一,严重影响混凝土结构的使用寿命。本试验研究了C50高强度混凝土抗冻性能随纤维素纤维掺量的变化规律,探讨了纤维素纤维改善混凝土抗冻性能的机理。试验结果表明：掺加纤维素纤维可以明显改善混凝土的抗冻性能,随着冻融次数的增加,纤维的作用愈加明显;300次冻融循环后,素混凝土的相对动弹性模量降为42.46%,而纤维混凝土试件U1、U2、U3和U4的相对动弹性模量分别为68.21%、67.42%、68.32%和70.17%。纤维掺量为0.9-1.5 kg/m^3时,纤维素纤维混凝土抗冻标号均大于D300。对于抗冻指标要求高的地区和结构,选用纤维掺量1.3 kg/m3比较经济合理。Freeze-thaw failure of concrete is one of the important diseases of durability. The service life of concrete structure engineering is thus reduced. The rule of the performance of the freeze-thaw resistance of cellulose fiber concrete with the different content of fiber is analyzed in this paper. And the mechanism of fiber reinforcing the performance of the freeze-thaw resistance of concrete is studied. The experimental results indicate that the performance of the freeze-thaw resistance of concrete is reinforced because of the fiber, and the reinforced effect of fiber became more and more obvious with increasing the times of freeze-thaw. The relative dynamic elastic modulus of concrete is 42.46 percent after 300 times of freeze-thaw, but the relative dynamic elastic modulus of U1,U2,U3 and U4 are 68.21 percent, 67.42 percent, 68. 32 percent, 70.17 percent. When the content of cellulose fiber is 0. 9--1.5 kg/m^3 , the anti-freeze labels of fiber concrete all are greater than D300. And it is reasonable that the content of cellulose fiber is 1.3 kg/m^3 for these region and structure required high anti-freeze label.

关 键 词：纤维素纤维 冻融循环 相对动弹性模量 混凝土 

分 类 号：TU528.31[建筑科学—建筑技术科学]