超高强度混凝土钢纤维黏结性能研究  

Research on the Adhesion of Steel Fiber in Ultra-High Performance Concrete

作　　者：汪菊[1] 秦佳俊 WANG Ju;QIN Jiajun(Anhui Vocational College of National Defense Science and Technology,Lu′an Anhui 237001,China;Anhui University of Civil Engineering and Architecture,Hefei 230601,China)

机构地区：[1]安徽国防科技职业学院,安徽六安237001 [2]安徽建筑大学,合肥230601

出　　处：《长春工程学院学报（自然科学版）》2024年第2期19-22,共4页Journal of Changchun Institute of Technology：Natural Sciences Edition

基　　金：安徽省教育厅2021年优质继续教育网络课程(2021tzpy41);安徽省教育厅2022年教研项目(2022jyxm238);安徽省教育厅2022年高校优秀青年骨干教师国内访问研修项目(gxgnfx2022190)。

摘　　要：钢纤维与混凝土基体的黏结性能是应力转换和裂缝控制的关键,能显著影响超高性能混凝土(UHPC)的力学性能。为增强钢纤维黏结性能,提出利用微生物诱导方解石沉淀(MICP)技术,对钢纤维表面进行预处理。研究结果表明,MICP不仅在钢纤维表面生成碳酸钙晶体,导致钢纤维粗糙度增加,还提高了钢纤维的黏结强度和拉拔性能,使水化产物附着在纤维表面。微观结果表明,MICP技术可以增强钢纤维与基体之间的黏合行为。因此,采用MICP技术处理钢纤维可使UHPC的抗压强度和抗折强度分别提高16%和50%。将MICP技术用于超高强度混凝土中有助于提高钢纤维黏结性能。The adhesion between steel fibers and concrete matrix is the key to stress conversion and crack control,and can significantly affect the mechanical properties of Ultra-High Performance Concrete(UHPC).To enhance the adhesion of steel fibers,a Microorganism Induced Calcite Precipitation(MICP)technique is proposed to pretreat the surface of steel fibers.The research results indicate that MICP not only generates calcium carbonate crystals on the surface of steel fibers,but also leads to an increase in roughness of steel fibers.It also improves the adhesion and drawing performance of steel fibers,allowing hydration products to adhere to the surface of the fibers.The microscopic results indicate that MICP technique can enhance the adhesion behavior between steel fibers and matrix.Therefore,MICP technique can increase the compressive strength and flexural strength of UHPC by 16%and 50%respectively by treating steel fibers.The application of MICP technique in UHPC can help improve the adhesion performance of steel fibers.

关 键 词：微生物 混凝土 钢纤维 黏结性能 

分 类 号：TU528.31[建筑科学—建筑技术科学]