MgO膨胀剂在地下管廊裂缝控制中的研究与应用

RESEARCH AND APPLICATION OF MgO EXPANSIVE AGENT IN CRACK CONTROL OF UNDERGROUND PIPE GALLERY

北京综合管廊项目针对施工气温高、混凝土早期强度高、大体积混凝土浇筑等特殊要求,采用新型MgO膨胀剂补偿混凝土收缩,通过优化混凝土配合比、控制绝热温升、延长混凝土凝结时间、加强后期养护等综合措施,降低了混凝土的开裂风险,大幅减少了混凝土裂缝。

For the high temperature,high early strength requirements of concrete and large volume concrete pouring,the new MgO expansive agent was used to compensate the shrinkage of concrete in a comprehensive pipe gallery project in Beijing.The risk of concrete cracking was reduced by optimizing the mixing ratio of concrete,controlling the adiabatic temperature rise,prolonging the concrete setting time,strengthening the post-curing and other comprehensive measures,and the concrete cracks were greatly reduced.