养护方式对外掺轻烧MgO混凝土性能的影响  

Effect of curing method on the properties of MgO-base expansive concrete

作　　者：杨琳 殷绪敏 周飞龙 张守治[2] ANG Lin;YIN Xumin;ZHOU Feilong;ZHANG Shouzhi(China Communications Second Navigational Bureau Guangxi Construction Engineering Co.,Ltd.,Nanning 530200,China;State Key Laboratory of High Performance Civil Engineering Material,Jiangsu Research Institute of Building Science,Nanjing 210024,China)

机构地区：[1]中交二航局广西建设工程有限公司,广西南宁530200 [2]江苏省建筑科学研究院有限公司高性能土木工程材料国家重点实验室,江苏南京210024

出　　处：《混凝土》2025年第1期90-93,103,共5页Concrete

基　　金：国家自然科学基金(52378239);广西科技计划项目(桂科AB22036007-6)。

摘　　要：以外掺轻烧Mg O混凝土为研究对象,探究了不同养护方式变化对Mg O混凝土力学性能、碳化性能和氯离子渗透性能的影响规律,以期为外掺轻烧Mg O混凝土的施工应用提供参考。结果表明:养护方式对外掺轻烧Mg O混凝土性能有明显影响,特别是早期8 h养护方式对外掺轻烧Mg O混凝土力学性能、抗碳化性能和抗氯离子渗透性能的提升有显著的影响。早期不当的养护所造成的孔隙率提高、有害孔最多、微裂纹的产生及骨料与浆体黏结性能的劣化是造成外掺Mg O混凝土力学性能及耐久性降低的主要因素。The effect of curing method on the mechanical properties,carbonation depth and chloride ion permeability of MgO-base expansive concrete were studied.The results showed that the curing method has a significant impact on the performance of MgO-base expansive concrete.Early curing can significantly improve the mechanical properties,carbonation resistance and chloride ion penetration resistance of MgO-base expansive concrete.The main factors causing the decrease in mechanical properties and durability of MgO-base expansive concrete are the increase in porosity,the most harmful pores,the generation of microcracks,and the deterioration of the bonding performance between aggregates and slurries caused by improper early maintenance.

关 键 词：养护方式 MGO混凝土 力学性能 碳化性能 氯离子渗透性能 

分 类 号：TU528.064[建筑科学—建筑技术科学]