超高性能混凝土中纤维的界面效应及其与水泥基材的匹配性研究  

Research on Interface Effect of Fibers in Ultra High Performance Concrete and Its Matching with Cement Substrates

作　　者：王金歌 WANG Jin-ge(Guangdong Technology College,Zhaoqing 526000,China)

机构地区：[1]广东理工学院,肇庆526000

出　　处：《建材世界》2024年第1期14-17,共4页The World of Building Materials

基　　金：广东省教育厅2021年“广东省本科高校教学质量与教学改革工程建设项目”《集成房屋制造科产教融合实践教学基地》(KCJJD202101)。

摘　　要：为了解决超高性能混凝土脆性大和易开裂的问题,增加其抗拉强度和韧性,研究建立了室内试验模型,通过单纤维拉拔试验研究不同纤维类型和纤维埋置深度对水泥基材界面的黏结性能影响。结果表明,在相同的水泥基材料条件下,不锈钢纤维的抗拔荷载最大,束状单丝聚丙烯纤维的抗拔荷载次之,短切丝碳纤维的抗拔荷载远小于不锈钢纤维和束状单丝聚丙烯纤维,纤维类型对界面黏结强度、抗拔荷载影响规律一致;随着纤维埋置深度的增加,不锈钢纤维的和束状单丝聚丙烯纤维的最大拔出荷载均不断增加,而界面黏结强度均不断减小,短切丝碳纤维的最大拔出荷载和界面黏结强度变化不明显。In order to address the issues of high brittleness and susceptibility to cracking in ultra-high performance concrete,and to increase its anti-pulling strength and toughness,an indoor test model was established to study the impact of different fiber types and fiber burial depths on the bonding performance of cement-based interface through single fiber pull-out test.The results show that under the same cement-based material conditions,stainless steel fibers have the highest anti-pull load,followed by monofilament polypropylene fibers in bundles.The anti-pulling load of short chopping carbon-fiber is much smaller than that of stainless steel fiber and monofilament polypropylene fiber in bundles.The influence of fiber type on interfacial bonding strength and anti-pulling load is consistent.As the depth of fiber embedding increases,the maximum pull-out load of stainless steel fibers and monofilament polypropylene fibers in bundles both increase,while the interfacial bonding strength decreases.The maximum pull-out load and interfacial bonding strength of monofilament polypropylene fibers in bundles do not show significant changes.

关 键 词：水泥基材 超高性能混凝土 界面效应 荷载-位移 不锈钢纤维 

分 类 号：TU528[建筑科学—建筑技术科学]