界面处理对混杂纤维混凝土弯曲性能的影响  

Impact of Enhanced Interface Treatment on Flexural Properties of Fiber Reinforced Concrete

作　　者：李永鹏[1] 何锐[2] 嵇绍华[2] 陈拴发[1] 

机构地区：[1]长安大学交通铺面材料教育部工程研究中心,西安710061 [2]长安大学公路学院,西安710064

出　　处：《武汉理工大学学报》2013年第4期27-31,36,共6页Journal of Wuhan University of Technology

基　　金："十二五"国家科技支撑计划(2011BAE27B04)

摘　　要：为提高聚丙烯粗合成纤维与水泥基体的粘结性,采用聚丙烯酰胺(PAM)溶液对粗合成纤维进行浸泡处理后制备纤维混凝土,利用显微硬度仪、SEM和纤维拔出试验对纤维/基体界面性能进行分析,并对纤维混凝土的弯曲性能进行讨论。结果表明,粗合成纤维经处理后,其与基体界面显微硬度和粘结增大,抗弯拉强度和极限挠度明显提高,韧性指数I5,I10和I30亦有较大幅度增长;纤维经处理后,其表面的PAM粘膜可与水泥水化产物发生物理化学作用,降低水化产物结晶度,优化界面区微结构,增强其与基体粘结,使粗合成纤维在拔出过程中消耗更多的能量,延缓大裂缝的扩展与破坏,从而充分发挥其增强增韧作用。To improve the adhesion of polypropylene crude synthetic fibers and cement matrix, crude synthetic fibers was treated by polyacrylamide （PAM） solution and used to prepare fiber reinforced concrete. Fiber/matrix interface was analyzed by fiber/matrix interface microhardness test,SEM observation and fiber pullout test. Then bending properties of fiber reinforced concrete was discussed. The results showed that crude synthetic fiber after treatment, microhardness and bond strength increased,the flexural strength and ultimate deflection significantly improved, toughness index Is, I10 and Ia0 also more substantial increased. Finally, reinforcing and toughening mechanism of the modified crude synthetic fibers was analyzed. PAM mucosa on surface of fiber with treated can have physical and chemical reactions with the cement hy- dration products,degree of crystallinity of the hydration products was reduced, micro-structure of the interracial region was optimized, adhesive performance of fiber and matrix was enhanced, the crude synthetic fibers in the punching process- consume consumed more energy, crack propagation and damage were slower, and enhanced toughening effect of fiber was given full play.

关 键 词：聚丙烯粗合成纤维 表面处理 混杂纤维混凝土 弯曲性能 

分 类 号：TU528.52[建筑科学—建筑技术科学]