摘要
基于试验研究了温度效应与应变率效应对玄武岩纤维混凝土力学性能的影响。采用电液伺服压力机及分离式霍普金森压杆(SHPB)试验装置,在低温(10℃、0℃、-10℃、-20℃、-30℃)环境下对玄武岩纤维混凝土开展不同冲击气压下的单轴压缩试验,分析试件应力-应变曲线、抗压强度、抗拉强度及增长因子与温度和冲击气压间的关系。结果表明:温度的降低使试件峰值应力增大,峰值应变减小;0.55 MPa冲击气压作用下,相较于10℃,温度为0℃、-10℃、-20℃、-30℃时试件抗压强度增幅分别为1.50%、7.09%、15.83%、23.34%,抗拉强度增幅分别为10.34%、23.17%、38.86%、60.78%,低温作用下试件峰值抗压强度、抗拉强度增大,抵抗外荷载能力增加,延性降低;不同冲击气压下,试件抗压、抗拉强度DIF随着温度的降低而增大,低温环境使试件应变率效应更加敏感,且抗拉强度的应变率效应敏感性高于抗压强度的应变率效应敏感性;低温环境下,对试件的峰值抗拉强度、抗压强度影响应优先考虑温度效应,其次考虑应变率效应。
The effects of temperature effect and strain rate effect on the mechanical properties of basalt fiber reinforced concrete were studied based on experiments.An electro-hydraulic servo press and a split Hopkinson pressure bar(SHPB)were used to carry out uniaxial compression tests of basalt fiber reinforced concrete under different impact pressures in low temperature environments(10℃、0℃、-10℃、-20℃、-30℃).The relationship between specimen stress-strain curve,compressive strength,tensile strength and growth factor with temperature and impact pressure was analyzed.The results show that the decrease of the temperature increases the peak stress of the specimen,while the peak strain decreases.Compared with 10℃under the action of 0.55 MPa impact air pressure,the compressive strength of the specimens increased by 1.50%,7.09%,15.83%and 23.34%at the temperatures of 0℃,-10℃,-20℃and-30℃.The strength increases 10.34%,23.17%,38.86%and 60.78%,respectively.Under the action of low temperature,the peak compressive strength and tensile strength of the specimen increase,the resistance to external load increases,and the ductility decreases.Under different impact pressures,the compressive and tensile strength DIF of the specimen increases with the decrease of temperature.The low temperature environment makes the specimen more sensitive to the strain rate effect,and the strain rate effect sensitivity of tensile strength is higher than that of compressive strength.In the low temperature environment,the influence of the peak tensile strength and compressive strength of the specimen should be given priority to the temperature effect,followed by the strain rate effect.
作者
张志鹏
张凯章
巩达
ZHANG Zhipeng;ZHANG Kaizhang;GONG Da(Department of Road and Bridge Engineering,Inner Mongolia Transportation Vocational and Technical College,Chifeng 024005,China;Shaanxi Construction Machinery Construction Group Co.,Ltd.,Xi’an 710032,China;School of Engineering and Technology,China University of Geosciences,Beijing 100083,China)
出处
《复合材料科学与工程》
CAS
北大核心
2023年第9期36-41,66,共7页
Composites Science and Engineering
基金
国家自然科学基金(51878031)。
关键词
玄武岩纤维
低温
抗压强度
抗拉强度
DIF
温度效应
应变率效应
复合材料
basalt fiber
low temperature
compressive strength
tensile strength
DIF
temperature effect
strain rate effect
composites
