哈尔滨工程大学学报2024，Vol.45Issue(4)：633-641,9.DOI:10.11990/jheu.202303035
玄武岩-聚乙烯醇纤维水泥基材料的高温性能
High-temperature performance of a basalt/polyvinyl alcohol hybrid fiber cementitious composite
摘要
Abstract
To improve the serviceability of engineered cementitious composites under a high-temperature environ-ment,a basalt and polyvinyl alcohol fiber reinforced hybrid fiber engineered cementitious composite was developed.Cylinder and dumbbell specimens were used to investigate the effect of basalt fiber on compressive and tensile per-formance at elevated temperatures.Scanning electron microscopy and fiber rupture space were used to conduct the mechanism analysis.The test results revealed that basalt fiber can fill in the matrix and transfer stress among micro-cracks at elevated temperatures.Its optimal volume fraction was 0.9%,where the compressive strength,elastic modulus,and first-cracking strength were higher than those of the control group by 80.08%,101.83%,and 114.38%at 600℃.Meanwhile,the mechanism analysis results demonstrated that basalt fiber tends to rupture at the debonding stage,thus losing its contributions to crack bridging and being unable to improve the tensile brittle-ness caused by the melting of the polyvinyl alcohol fiber.关键词
混杂纤维/高温/力学性能/玄武岩纤维/纤维断裂空间/替换掺量/微观机理/水泥基材料Key words
hybrid fiber/high temperature/mechanical performance/basalt fiber/fiber rupture space/replacement volume fraction/micro-level mechanism/cementitious material分类
建筑与水利引用本文复制引用
沈思正,庄金平,王浩,鲁聪,杨宇,朱小杰..玄武岩-聚乙烯醇纤维水泥基材料的高温性能[J].哈尔滨工程大学学报,2024,45(4):633-641,9.基金项目
国家自然科学基金项目(51678152) （51678152）
福建省自然科学基金项目(2021J011063) （2021J011063）
新世纪优秀人才支持计划(GY-Z17069). （GY-Z17069）
