中文摘要：

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。

英文摘要：

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.