摘要
抗裂性能和热工性能是陶粒轻骨料混凝土应用于建筑围护墙板的重要性能。为研究陶粒预湿时间与玄武岩纤维体积掺量对玄武岩纤维陶粒混凝土抗裂性能与热工性能的影响,本文开展了玄武岩纤维陶粒混凝土轴心抗压强度、弹性模量及导热系数试验,并以弹强比和导热系数为指标对其抗裂性能和热工性能进行评价。结果表明:陶粒预湿和外掺玄武岩纤维均会增大混凝土的导热系数,但热工性能仍满足公共建筑外墙用陶粒混凝土的规范要求;当玄武岩纤维体积掺量为0.2%、陶粒预湿时间为72 h时,混凝土试件的导热系数为0.1002 W/(m·K),弹强比为1109,在满足热工性能要求的同时,其抗裂性能提升幅度最大,提升率为19.5%;基于现有的混凝土弹性模量与轴心抗压强度转换公式模型,提出了适用于玄武岩纤维陶粒混凝土的修正模型,相关系数为0.9057。
Crack resistance and thermal performance are the critical properties of ceramsite lightweight aggregate concrete used in building wall panels.To study the influences of ceramsite pre-wetting time and basalt fiber volume content on the crack resistance and thermal performance of basalt fiber ceramsite concrete,the axial compressive strength,elastic modulus and thermal conductivity tests of basalt fiber ceramsite concrete were carried out in this paper,and the elastic strength ratio and thermal conductivity were used as indicators to evaluate the crack resistance and thermal performance of basalt fiber ceramsite concrete.The results show that both ceramsite pre-wetting and basalt fiber increase the thermal conductivity of concrete,but its thermal performance still meets the specification requirements of ceramsite concrete for the external walls of public buildings.When the volume content of basalt fiber is 0.2%and the pre-wetting time of ceramsite is 72 h,the thermal conductivity of concrete specimen is 0.1002 W/(m·K)and the elastic strength ratio is 1109.While meeting the requirements of thermal performance,the crack resistance of concrete specimen increases the most,the increase rate is 19.5%.Based on the existing conversion formula model of concrete elastic modulus and axial compressive strength,a modified model suitable for basalt fiber ceramsite concrete is proposed,and the correlation coefficient is 0.9057.
作者
朱振中
刘元珍
王文婧
王鲜星
段鹏飞
ZHU Zhenzhong;LIU Yuanzhen;WANG Wenjing;WANG Xianxing;DUAN Pengfei(College of Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Facult of Engineering,China University of Geosciences,Wuhan 430079,China)
出处
《硅酸盐通报》
CAS
北大核心
2023年第3期908-916,共9页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(52278267,52078473,5201101735)
山西省留学回国人员科研资助项目(2022-064)
住建部科学技术计划项目(2021-K-046)。
关键词
陶粒混凝土
预湿时间
玄武岩纤维
抗裂性能
热工性能
修正模型
ceramsite concrete
pre-wetting time
basalt fiber
crack resistance
thermal performance
modified model
