基于Weibull分布多壁碳纳米管混凝土盐冻损伤分析

Salt Freezing Damage Analysis of Multi-walled Carbon Nanotubes Concrete Based on Weibull Distribution

摘要:

开展了不同多壁碳纳米管（MWCNTs）掺量混凝土的硫酸盐侵蚀和冻融循环耦合试验，分析了MWCNTs混凝土的耐久性劣化规律，同时基于Weibull分布建立了MWCNTs混凝土的可靠性分析模型.结果表明：掺入MWCNTs可提高混凝土的抗盐冻性能，掺入0.05% MWCNTs的混凝土经历200次耦合循环后抗压强度比对照组提高了14.5%，此掺量下MWCNTs对混凝土的抗盐冻性改善效果最好；建立的基于Weibull分布可靠性模型能较好地预测盐冻环境下MWCNTs混凝土的损伤劣化情况，预测结果与试验结果一致.

Abstract:

Coupled tests of sulfate corrosion and freeze-thaw cycling were conducted on concrete with different dosages of multi-walled carbon nanotubes （MWCNTs）.The durability degradation behavior of MWCNTs concrete was investigated. Meanwhile， the reliability analysis model of MWCNTs concrete was established based on Weibull distribution. The results indicate that the incorporation of MWCNTs effectively enhances the salt freezing resistance of concrete. After 200 coupled cycles， the compressive strength of concrete with 0.05% MWCNTs is 14.5% higher than that of plain concrete， achieving the best improvement effect on salt freezing resistance under this dosage. The proposed reliability model based on Weibull distribution can predict the deterioration of MWCNTs concrete in a salt freezing environment， and the predicted results are in good agreement with the experimental data.