热养护下矿物掺合料高性能混凝土强度损失和孔结构研究  

Study on Strength Loss and Pore Structure of High-performance Concrete with Mineral Admixtures under Thermal Curing

作　　者：王晓琰 李峰 岳阳 方顺 WANG Xiaoyan;LI Feng;YUE Yang;FANG Shun

机构地区：[1]甘肃五环公路工程有限公司,甘肃兰州730050 [2]甘肃省桥梁工程研究中心,甘肃兰州730050

出　　处：《城市道桥与防洪》2022年第3期186-189,222,M0016,共6页Urban Roads Bridges & Flood Control

摘　　要：为了研究热养护对矿物掺合料高性能混凝土后期强度和微观结构的影响,不同恒温时长、不同恒温温度养护下矿物掺合料高性能混凝土进行强度试验和孔结构分析.结果表明:与标准养护相比,热养护能快速提升混凝土早期强度,但热养护温度越高、时间越长,混凝土后期的强度损伤越大,孔隙率也越大.80℃热养护48 h后转标准养护28 d的强度损失为50℃的4.4倍,总孔隙率为1.091倍.与标准养护和自然养护相比,后养护方式采用Ca(OH)_(2)饱和水溶液养护,对热养护混凝土的后期强度和孔径分布有一定的改善.In order to study the influence of thermal curing on the later strength and microstructure of high-performance concrete with mineral admixture,the strength test and pore structure analysis of high-performance concrete with mineral admixture are carried out in the different constant temperature durations and the different temperatures of curing.The results show that compared with the standard curing,the thermal curing can quickly increase the early strength of concrete,but the higher the thermal curing temperature,the longer the thermal curing time,the greater the damage to the later strength of the concrete and the greater the porosity.The strength loss at 80℃ thermal curing for 48 h after transferring to standard curing for 28 d is 4.4 times that at 50℃,and the total porosity is 1.091 times.Compared with the standard curing and the natural curing,the post-curing method is to use Ca(OH)_(2) saturated aqueous solution curing,which can improve the later strength and pore size distribution of the thermal cured concrete to a certain extent.

关 键 词：热养护 早期强度 强度损失 孔结构 

分 类 号：U414[交通运输工程—道路与铁道工程]