高温处理对聚乙烯纤维-钢纤维高韧性水泥基复合材料抗折性能的影响  

Effects of High Temperature Treatment on Flexural Property of Polyethylene Fiber-Steel Fiber High Toughness Cement Matrix Composites

作　　者：张港 谢群[1] 于晓伟 赵鹏 ZHANG Gang;XIE Qun;YU Xiaowei;ZHAO Peng(School of Civil Engineering and Architecture,University of Jinan,Jinan 250022,Shandong,China;Audit Office,University of Jinan,Jinan 250022,Shandong,China)

机构地区：[1]济南大学土木建筑学院,山东济南250022 [2]济南大学审计处,山东济南250022

出　　处：《济南大学学报（自然科学版）》2024年第6期749-754,762,共7页Journal of University of Jinan(Science and Technology)

基　　金：国家自然科学基金项目(52108214);山东省住房城乡建设科技计划项目(2020-K5-18)。

摘　　要：为了探究高韧性水泥基复合材料经高温处理后的力学性能,采用聚乙烯纤维与钢纤维混杂方式制备一种混杂纤维高韧性水泥基复合材料,通过三点抗折试验探讨所制得聚乙烯纤维-钢纤维高韧性水泥基复合材料经温度20、60、100、150、200、250℃处理后的抗折性能。结果表明:随着处理温度的升高,该复合材料的开裂应力、峰值应力和弯曲韧性均表现为先增大后减小的变化规律,处理温度为60、150℃时最大开裂应力为12.09 MPa,最大峰值应力为18.52 MPa;峰值应力受处理温度的影响较显著,当处理温度为200、250℃时,聚乙烯纤维熔化,复合材料的峰值应力相较于处理温度为150℃时的分别减小42.7%、57.9%;该复合材料的弯曲韧性在指定挠度为L/150、L/100(其中L为支座间跨度)阶段受处理温度影响较小,在指定挠度为L/50、L/25阶段,随着处理温度的升高而先增大后减小,聚乙烯纤维熔化导致复合材料在大挠度阶段的弯曲韧性明显减小。To investigate mechanical properties of high toughness cement matrix composites after high temperature treatment,a kind of hybrid fiber high toughness cement matrix composite was prepared by using hybrid mode of polyethylene fibers and steel fibers.Flexural performance of the prepared high toughness hybrid fiber cement matrix composites treated at 20,60,100,150,200,250℃was investigated by using three-point flexural test.The results show that with the increase of the treatment temperature,cracking stress,peak stress,and flexural toughness of the prepared composite increase first and then decrease.The maximum cracking stress of 12.09 MPa and the peak stress of 18.52 MPa are obtained at the treatment temperature of 60℃and 150℃,respectively.The peak stress is significantly influenced by the treatment temperature.When the treatment temperature is 200℃and 250℃,the polyethylene fibers melt,and the peak stress of the prepared composite thus respectively decreases by 42.7%and 57.9%compared with that at the treatment temperature of 150℃.The flexural toughness of the prepared composite is slightly affected by treatment temperature during stages with specified deflection of L/150 and L/100(where L is span between supports),while during stages with deflection of L/50 and L/25,the flexural toughness increases first and then decreases with the increase of the treatment temperature.The melting of polyethylene fibers results in obvious decrease of flexural toughness of the prepared composite at large deflection stages.

关 键 词：高韧性水泥基复合材料 高温处理 抗折性能 弯曲韧性 聚乙烯纤维 钢纤维 

分 类 号：TU528.58[建筑科学—建筑技术科学] TU525