钢纤维改善混凝土力学性能和微观结构的研究  

Research on Improving the Mechanical Properties and Microstructure of Concrete with Steel Fiber

作　　者：白敏[1,2] 牛荻涛[2] 姜磊[2] 苗元耀[2] 

机构地区：[1]长安大学材料科学与工程学院,西安710064 [2]西安建筑科技大学土木工程学院,西安710055

出　　处：《硅酸盐通报》2013年第10期2084-2089,共6页Bulletin of the Chinese Ceramic Society

基　　金：国家杰出青年科学基金(50725824)资助项目

摘　　要：研究了水胶比为0.45,钢纤维掺量为0、0.5%、1.0%、1.5%和2.0%的五种混凝土的力学性能以及其水化28天后的微观形貌。结果表明:钢纤维对混凝土的抗压强度改善并不明显,当钢纤维掺量为1.5%时,混凝土的抗压强度仅比普通混凝土提高了7.4%;但钢纤维的掺入大大提高了混凝土的劈裂抗拉强度和抗折强度,当钢纤维掺量为1.5%时,混凝土劈裂抗拉强度提高了80%,当钢纤维掺量为2.0%时,混凝土抗拉强度提高了近一倍。混凝土的宏观力学性能特征与微观结构分析结果相吻合。Evaluation of the mechanical properties and microstructure after hydrated 28 d for concrete are conducted, while the steel fiber content is 0,0. 5% , 1. 0% , 1. 5% and 2. 0% respectively. The experimental results show that the influence of steel fiber on the compressive strength of concrete is inconspicuous. When the content of steel fiber reaches 1. 5% the compressive strength of concrete enhances 7. 4% merely compared with common concrete. However, adding steel fiber in concrete improve the splitting strength and flexural strength of concrete considerably. In comparison to common concrete the splitting strength of concrete with 1.5% steel fiber increases 80%. The content of steel fiber is up to 2% while the flexural strength of concrete rises nearly one time. The test results about macroscopic mechanical properties agree well with the analytical results about microstructure.

关 键 词：钢纤维 混凝土 力学性能 微观形貌 

分 类 号：TU528[建筑科学—建筑技术科学]