摘要
通过氧化镁补偿收缩混凝土配合比优化设计、合理的施工浇筑方案、良好的保温保湿养护措施等做法,提高了苏州地铁车站侧墙大体积混凝土的抗裂防渗效果。实验段侧墙混凝土中心温度修正后微应变在14 d内达到最大值40με~70με,30 d后降至-50με~40με,到达温峰值后降温速率在2~4℃/d,最大里表温差6~8℃。表明氧化镁膨胀剂在大体积混凝土结构中具有良好的补偿收缩效果,采用“1层吸水树脂养护膜+1层土工布”养护措施具有较好的保温保湿效果。
Through optimization design of mix proportion of shrinkage-compensated concrete by MgO,reasonable construction pouring scheme,good heat and moisture conservation measures,etc.,anti-cracking and anti-seepage effect of mass concrete on side wall of subway station in Suzhou rail transit project was improved.Microstrain of side wall concrete reached maximum+40~+70με in 14 d after temperature correction,decreased to-50~+40με after 30 d.The cooling rate was 2~4℃/d after reaching the peak temperature,and maximum inside-outside temperature difference was 6~8℃.It showed that MgO expansive agent had good shrinkage compensation effect in mass concrete structure.The curing measures of one layer of absorbent resin curing film+one layer of geotextile'had good insulation and moisture retention effect.
作者
王德民
潘玮璠
郭耀雄
谷亚军
辜振睿
方博
WANG Demin;PAN Weifan;GUO Yaoxiong;GU Yajun;GU Zhenrui;FANG Bo(Wuhan Sanyuan Special Building Materials Co.Ltd.,Wuhan 430083,China;Suzhou Rail Transit Group Co.Ltd.,Suzhou 215004,China)
出处
《新型建筑材料》
2021年第9期129-132,共4页
New Building Materials
关键词
地铁车站
大体积混凝土
氧化镁膨胀剂
微应变
抗裂防渗
subway station
mass concrete
MgO expansion agent
microstrain
anti-cracking and anti-seepage
