基于刀口诱导约束法的纤维砂浆阻裂效应试验研究  

Experimental study on crack resistance of fiber mortar using knife-edge binding method

作　　者：李艺[1] 张诚[1] 丛溪 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110004 [2]沈阳市汽车工程学校,辽宁沈阳110122

出　　处：《混凝土》2012年第4期100-102,共3页Concrete

基　　金：国家自然科学基金资助项目(51078065);中央高校基本科研业务费项目(N090401009)

摘　　要：鉴于传统平板法抗裂试验复演性差的缺点,选择刀口诱导约束法进行纤维砂浆抗裂试验,研究纤维在水泥砂浆中的阻裂效应和影响规律。将等体积掺量(0.1%)单掺、混掺的杜拉纤维、玄武岩纤维砂浆与基体试件进行24h内抗裂性能试验对比。试验结果表明:对于单掺试件,纤维越长其抗裂性能越优,其中,30 mm的玄武岩纤维砂浆的抗裂性能提高了99.1%;对于混掺试件,长度相当的杜拉纤维和玄武岩纤维混掺抗裂性能最优,其抗裂性能提高了99.5%;随着掺入纤维种类(3种混掺)的增加,虽试件抗裂性能有所降低,但仍有75.6%的提高率。Due to the poor reproducibility of traditional plate method,the new knife-edge binding method is chosen to study the effects and the impact law in the crack resistance of the cement mortar with fiber in it.Mortar specimens with an equal volume of ash（0.1%） single-doped,mixed-doped du-la fiber and basalt fiber compared to the plain matrix mortar specimens on cracking performance tests within 24 h.The results showed that：For the single-doped specimen,the longer the fiber the more excellent of its crack resistance,30 mm basalt fiber mortar improves the cracking performance by 99.1%;for the mixed-doped specimen,with the similar length of du-la fibers and basalt fiber mixed in have the optimal performance,the cracking performance improves 99.5%;With mixed fiber types（three kinds of fiber mixed-doped） increasing,although the specimen crack resistance decreased,but still increase the rate of 75.6% in the cracking performance.

关 键 词：刀口诱导约束法 杜拉纤维 玄武岩纤维 阻裂 

分 类 号：TU528.01[建筑科学—建筑技术科学]