摘要
为研究不同玄武岩纤维长度、掺量及龄期下低热水泥混凝土劈拉强度演化规律,采用控制变量法以0.05 MPa/s加载速率完成了160块试件的劈拉试验,分析了不同龄期混凝土劈拉强度受玄武岩纤维掺量和长度的影响程度。结果表明:在不同玄武岩纤维掺量和长度条件下,玄武岩纤维对各龄期劈拉强度均有提升效果,但影响规律有显著差异;当玄武岩纤维长度为12 mm时,随纤维掺量增加,3、5、7、14 d龄期劈拉强度呈先增大后减小趋势,在纤维掺量为0.2%时达到峰值;当玄武岩纤维长度为24 mm时,随纤维掺量增加,各龄期劈拉强度均呈先增大后减小趋势,除14 d龄期外,其余龄期劈拉强度在纤维掺量为0.2%时达到峰值;最优玄武岩纤维长度为12 mm,掺量为0.2%。
To investigate the evolution of splitting tensile strength of low-heat cement concrete with varying basalt fiber lengths,contents,and curing ages,splitting tensile tests were conducted on 160 specimens using the control variable method at a loading rate of 0.05 MPa/s.The influence of basalt fiber content and length on the splitting tensile strength at different curing ages was analyzed.The results indicate that under conditions of varying basalt fiber content and length,the fibers enhance the splitting tensile strength at all ages,although the impact patterns differ significantly.When the fiber length was 12 mm,an increase in fiber content led to an initial rise followed by a decline in tensile strength at ages of 3,5,7,and 14 days,reaching a peak at a fiber content of 0.2%.When the fiber length was 24 mm,the splitting tensile strength exhibited an initial increase followed by a decrease as fiber content increased.Except for the 14-day curing age,the maximum strengths at all other ages were achieved at a fiber content of 0.2%.The optimal basalt fiber length and content were determined to be 12 mm and 0.2%,respectively.
作者
张国辉
顾德锦
谢金东
周明阳
赵波
ZHANG Guohui;GU Dejin;XIE Jindong;ZHOU Mingyang;ZHAO Bo(College of Electrical Power Engineering,Kunming University of Science and Technology,Kunming 650500,China;Huaneng Lancang River Hydropower Inc.,Kunming 650214,China)
出处
《水利水电科技进展》
北大核心
2025年第6期47-52,60,共7页
Advances in Science and Technology of Water Resources
基金
国家自然科学基金项目(52469021)
云南省基础研究计划面上项目(202401AT070338)。
关键词
玄武岩纤维
低热水泥混凝土
劈拉强度
养护龄期
basalt fiber
low-heat cement concrete
splitting tensile strength
curing age
