基于威布尔分布下纳米碳酸钙改性混凝土寿命预测研究  

Research on Life Prediction of Nano-CaCO_(3) Modified Concrete Based on Weibull Distribution

作　　者：乔宏霞[1,2] 杨安 杨博 李元可 杜杭威 QIAO Hongxia;YANG An;YANG Bo;LI Yuanke;DU Hangwei(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Key Laboratory of Disaster Prevention and Mitigation of Civil Engineering of Gansu Province,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学土木工程学院,兰州730050 [2]兰州理工大学甘肃省土木工程防灾减灾重点实验室,兰州730050

出　　处：《工业建筑》2022年第1期174-179,共6页Industrial Construction

基　　金：国家自然科学基金项目(51868044)。

摘　　要：为改善西部盐湖地区混凝土耐久性能,延长其服役寿命,通过研究半浸泡式纳米碳酸钙(CaCO_(3))改性混凝土的抗硫酸盐腐蚀性能,定期对试件进行质量损失以及相对动弹性模量的测评,并对其耐久性进行分析;同时采用威布尔(Weibull)函数建立纳米CaCO_(3)改性混凝土的耐久性退化模型。结果显示:在0~180 d的龄期内,试件的相对质量和相对动弹性模量有明显的增强,在180 d以后,试件耐久性开始逐步退化,其中相对动弹性模量评价参数更为敏感,能够清晰反映出试件的耐久性退化情况;通过Weibull函数建模计算得出概率密度函数和可靠度函数,确定出纳米CaCO_(3)改性混凝土在硫酸盐境下最长使用寿命可达到693 d左右。In order to solve the durability of concrete in the Salt Lake area of Western and extend its service life,the sulfate resistance of semi-immersed nano-CaCO_(3)modified concrete was studied.The quality loss and relative dynamic modulus of elasticity were evaluated regularly,and the durability of the concrete was analyzed;at the same time,the durability degradation model of nano-CaCO_(3)modified concrete was established by Weibull function.The results showed that the relative mass and relative dynamic modulus of elasticity of the specimens were obviously enhanced in the age of 0-180 d.After 180 d,the durability of the specimens gradually degenerated,among which the evaluation parameters of relative dynamic modulus of elasticity were more sensitive,which could clearly reflect the durability degradation of the specimens;the probability density function and reliability function were obtained by Weibull function modeling and calculation.The longest service life of nano-CaCO_(3)modified concrete could reach 693 d in sulfate environment.

关 键 词：混凝土 纳米CaCO_(3) 硫酸盐腐蚀 Weibull函数 寿命预测 

分 类 号：TU528[建筑科学—建筑技术科学]