渗浆法钢纤维增强磷酸镁水泥基复合材料的力学性能  

Mechanical Properties of Steel Fiber Reinforced Magnesium Phosphate Cement-Based Composite by Slurry Infiltrating

作　　者：李振 秦继辉[1] 尤超 岳燕飞[1] 贾兴文[1,3] 钱觉时[1] LI Zhen;QIN Jihui;YOU Chao;YUE Yanfei;JIA Xingwen;QIAN Jueshi(College of Materials Science and Engineering,Chongqing University,Chongqing 400045,China;Guizhou Phosphorus and Magnesium Materials Co.,Ltd,Guiyang 550023,China;College of Civil Engineering,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆大学材料科学与工程学院,重庆400045 [2]贵州磷镁材料有限公司,贵阳550023 [3]重庆大学土木工程学院,重庆400045

出　　处：《硅酸盐学报》2019年第11期1559-1565,共7页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金项目(51572039);国家自然科学基金国际合作项目(51461135003)

摘　　要：采用磷酸镁水泥(MPC)制备渗浆钢纤维增强材料(SIFCC),并与普通硅酸盐水泥(OPC)基体进行比较,研究钢纤维掺量对SIFCC抗压强度、抗弯强度、弯曲应力应变曲线和断裂韧性的影响,根据单根钢纤维拔出试验和断裂面微观形貌,分析MPC-SIFCC的增强机制。结果显示:MPC制备的SIFCC抗弯强度和断裂韧性提高显著,抗压强度在纤维掺量6%以上时提高明显;与同强度等级的OPC-SIFCC(28d)相比,MPC-SIFCC抗弯强度及断裂韧性提高幅度更大,钢纤维掺量10%的7 d抗弯强度可达77.4MPa。单根纤维拔出试验与微观形貌观察结果显示,与OPC相比,MPC与钢纤维有更高的黏结力。考虑MPC浆体在低水胶比下的良好流动性,可以认为MPC用于制备SIFCC具有较为明显的优势。Magnesium phosphate cement(MPC) was used to prepare slurry infiltrated fiber cement composite(SIFCC). The compressive strength, flexural strength, flexural stress-strain curves, fracture toughness of SIFCC at different fiber volume fractions were examined. The reinforcement mechanism of MPC-SIFCC was analyzed based on the pull out displacement-load curves of single steel fiber from SIFCC matrix and microstructure of fracture surface of SIFCC. The results show that the SIFCC prepared by MPC can improve the flexural strength and fracture toughness, and the compressive strength can be improved at a fiber content of more than 6%. Compared to OPC matrix at the same strength grade, the MPC-SIFCC has higher flexural strength and fracture toughness at the same fiber volume fraction, the flexural strength of 77.4 MPa can be achieved at 10% fiber content at age of 7 d. Based on the results of pull out test and microstructure, the MPC has a greater bond strength with steel fiber, compared to OPC, indicating that the MPC has some advantages in preparing SIFCC according to the favorable fluidity of MPC in a low water-binder ratio.

关 键 词：磷酸镁水泥 钢纤维增强 渗浆 力学性能 

分 类 号：TU528.572[建筑科学—建筑技术科学]