不同温度和掺量条件下玄武岩纤维混凝土力学性能研究  

Study on the mechanical properties of basalt fiber concreteunder different temperature and with different dosage

作　　者：刘永旺 刘磊[2] 孟祥 Liu Yongwang;Liu Lei;Meng Xiang(School of Public Safety and Emergency Management,Kunming University of Science and Technology,Kunming Yunnan 650093,China;School of Land Resource Engineering,Kunming University of Science and Technology,Kunming Yunnan 650093,China)

机构地区：[1]昆明理工大学公共安全与应急管理学院,云南昆明650093 [2]昆明理工大学国土资源工程学院,云南昆明650093

出　　处：《化工矿物与加工》2022年第6期26-31,共6页Industrial Minerals & Processing

基　　金：国家自然科学基金(11862010)。

摘　　要：为了探究不同体积掺量玄武岩纤维增强混凝土在高温后的力学性能,采用TAW2000D电液伺服岩石三轴仪对掺量分别为0%、0.1%、0.2%、0.3%的混凝土试件进行了高温后力学试验,得到了静态压缩的应力-应变曲线,探讨了不同掺量在25~800℃温度条件下的力学性能,结果表明:随着温度的升高,玄武岩纤维混凝土峰值应变存在逐渐右移的趋势,即由脆性破坏向塑性破坏转变,抗压强度呈先增大后减小的规律;由不同掺量、不同温度条件下的抗压强度曲线和拟合关系式可知,在25~200℃时抗压强度与温度呈线性增加关系,在200~800℃时抗压强度与温度呈非线性减小的规律;同一体积掺量条件下,随着温度的升高,静弹性模量呈线性减小的规律;玄武岩纤维体积掺量为0.2%时的试件力学性能最优。研究成果可为纤维增强混凝土建(构)筑物火灾后的安全评价和修复提供理论指导。In order to investigate the mechanical properties of basalt fiber reinforced concrete at high temperature,the TAW2000D electrohydraulic servo rock triaxial apparatus was employed to perform mechanical tests on the concrete sample prepared with basalt fiber dosage of 0%,0.1%,0.2%,0.3%by volume respectively at high temperature,thus a static compression stress-strain curves was resulted,and the mechanical properties of the concrete with different basalt fiber dosage by volume at the temperature of 25~800℃were discussed.The results show that as the temperature rises,the peak strain of basalt fiber concrete gradually shifts to the right of the curve,indicating the transition from fragile failure to plastic failure and the compression strength firstly increases and then decreases.From the fitting diagram and the fitting relation expression of the compressive strength curve at different dosages and different temperatures,we can see that the compressive strength increased linearly with the temperature ranging from 25℃to 200℃,but it decreased nonlinearly with the temperature ranging from 200℃to 800℃.With the same dosage by volume,the static elastic modulus presented a linear decrease as the temperature increased the optimal mechanical performance of the sample was achieved with basalt fiber dosage of 0.2%by volume.The research results can be pro-vided as the theoretical guidance for the safety evaluation and rehabilitation of fiber reinforced concrete buildings after fire.

关 键 词：玄武岩纤维混凝土 力学性能 应力-应变曲线 抗压强度 静弹性模量 微裂隙 高温 体积掺量 

分 类 号：TU528[建筑科学—建筑技术科学]