水利水电技术（中英文）

运用常规的混凝土力学性能试验,研究钢纤维种类及体积掺量对混凝土力学性能的影响,依据工程实际,通过力学性能试验及理论分析等方法,以抗压、抗折强度提高量作为评价指标,分析了四种体积掺量和不同种类钢纤维配制成水胶比为0.4的胶砂试件的抗压、抗折强度增长情况及流动度情况,并采用SPSS软件进行相关方差分析。结果表明:钢纤维掺量在0.5%².5%之间时,试件抗压强度较基准试件提高了7.1%~67.2%、抗折强度较基准试件提高了2.2%~67.0%。体积掺量为2.5%时,抗压强度可达69.5 MPa,比基准试件提高67.2%;抗折强度可达15.2 MPa,比基准试件提高67.0%。相同掺量下微细纤维的流动度优于长纤维的流动度,掺加钢纤维后能有效防止混凝土开裂,不同种类及不同掺量钢纤维均对抗压、抗折强度有显著的影响。研究成果可为低水胶比高强度的超高性能混凝土选取钢纤维提供参考和依据。

The effects of type and volume content of steel fiber on mechanical properties of concrete are studied herein with the conventional concrete mechanical properties test. Based on the relevant engineering practice,the increases of the compressive strengths and flexural strengths as well as the fluidities of the cement-sand specimens with the water-cement ratio of 0. 4 mixed with four volume contents and different types of steel fibers are analyzed herein,and then the correlation analysis of variance is made with SPSS software. The result shows that when the content of steel fiber is between 0. 5% and 2. 5%,the compressive strength of the specimen is increased by 7. 1% ~ 67. 2% and the flexural strength of the specimen is increased by 2. 2% ~67. 0% if compared with those of the reference specimen,while when the volume content is 2. 5%,the compressive strength can reach to 69. 5 MPa,which is increased by 67. 2% if compared with that of the reference specimen and the flexural strength can reach to 15. 2 MPa,which is increased by 67. 0% if compared with that of the reference specimen. Under the same content of steel fiber,the fluidity of the macro-fiber is better than that of the long fiber. After mixing with steel fiber,cracking of concrete can be effectively prevented,while all different types and volume contents of steel fiber have significant effects on the compressive strength and flexural strength of the concrete. The study result can provide reference and basis for selecting steel fiber for the preparation of the low water-cement ratio and ultra-high performance concrete.