Frost Resistance of Magnesium Oxychloride Cement Mortar Added with Highland Barley Straw Ash

作     者：CAO Feng QIAO Hongxia WANG Penghui LI Weijia LI Yuanke 曹锋;乔宏霞;WANG Penghui;LI Weijia;LI Yuanke

作者机构：School of Civil EngineeringLanzhou University of TechnologyLanzhou730050China School of Civil and Transportation EngineeringQinghai Minzu UniversityXining810000China Western Center of Disaste Mitigation in Civil Engineering of Ministry of EducationLanzhou730050China 

出 版 物：《Journal of Wuhan University of Technology(Materials Science)》 (武汉理工大学学报（材料科学英文版）)

年 卷 期：2022年第37卷第5期

页      面：912-921页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：Funded by the National Natural Science Foundation of China (No.51868044) Basic Research Program of Qinghai Province (No.2022-ZJ-921) 

主　　题：magnesium oxychloride cement highland barley straw ash freeze-thaw resistance pore diameter distribution microstructure reliability 

摘      要：In order to study the influence of highland barley straw ash (HBSA) prepared under certain conditions on the durability of magnesium oxychloride cement mortar (MOCM) under freeze-thaw damage,rapid freeze-thaw cycle tests were carried out *** relative mass evaluation parameters and the relative compressive strength evaluation parameters,which represent the degradation of freeze-thaw resistance,were used as the indices to study the degradation rule of ***,nuclear magnetic resonance (NMR) tests were carried out on MOCM under different freeze-thaw cycles to analyze the pore diameter changes in the freeze-thaw *** microstructure of MOCM was tested by Fourier transform infrared spectroscopy (FTIR),X-ray diffraction (XRD) and scanning electron microscopy (SEM),and then the effect mechanism of HBSA on the anti-freezing performance of MOCM was ***,the two-parameter Weibull distribution function was used to analyze the reliability of durability degradation of MOCM added with HBSA under freeze-thaw *** specific conclusions are as follows:With the increase of HBSA s addition,the freeze-thaw resistance of MOCM increase firstly and then *** the addition of HBSA is 10%,the decay rate of relative mass evaluation parameters and relative compressive strength evaluation parameters is the slowest,and the frost resistance is the *** proportion of harmful pores and more harmful pores in MOCM added with 10% HBSA decreases by 25.11% and 21.34%,compared with that without HBSA before and after freeze-thaw cycles.A lot of magnesium silicate hydrate (M-S-H) gels are generated in MOCM with HBSA content of 10%,which fills part of the pores,so that the proportion of harmful pores and more harmful pores is the *** Weibull function can be effectively applied to the reliability analysis of the freeze-thaw cycle of MOCM added with HBSA,and the theoretical results are in good agreement with the experimental results.