聚乙烯醇纤维对超高性能混凝土高温性能的影响  

Influence of polyvinyl alcohol fibers on the properties of ultra high performance concrete at high temperature

作　　者：赖建中[1] 徐升[1] 杨春梅[1] 过旭佳[1] 朱耀勇[1] 

机构地区：[1]南京理工大学材料科学与工程学院,江苏南京210094

出　　处：《南京理工大学学报》2013年第4期633-639,共7页Journal of Nanjing University of Science and Technology

基　　金：国家自然科学基金(51278249;50808101);江苏省土木工程材料重点实验室开放基金(2012CEM03);中国博士后科学基金(20080431100;200902520)

摘　　要：对含有聚乙烯醇(Polyvinyl alcohol,PVA)纤维的超高性能混凝土进行高温试验,从质量损失、超声波波速、抗压强度三方面分析高温作用后混凝土的性能变化规律。研究表明,随着加热温度升高,质量损失增大,超声波波速下降,混凝土抗压强度在300℃之前逐渐上升,400℃之后逐渐下降;混掺PVA纤维和钢纤维,既可以改善高温下超高性能混凝土的抗爆裂性能,又具有很高的残余强度。该文探讨了超高性能混凝土的高温爆裂机理,这种高温爆裂是由蒸汽压和组织结构变化共同导致的。The properties of polyvinyl alcohol(PVA)fiber reinforced ultra high performance concrete(UHPC)including quality loss,ultrasonic velocity and compressive strength are researched at high temperature.Results show that the quality loss increases and ultrasonic velocity decreases with the increase of the temperature.The compressive strength increases before 300 ℃ and decreases after 400 ℃ with the increase of the temperature.Reinforced by both PVA fiber and steel fiber,UHPC has both high anti-spalling ability and high remain compressive strength.The mechanism of the spalling of UHPC at high temperature is discussed and the spalling is caused by the vapor pressure and the composition chang in UHPC at high temperature.

关 键 词：超高性能混凝土 聚乙烯醇纤维 高温 爆裂 超声波法 抗压强度 

分 类 号：TU528.572[建筑科学—建筑技术科学]