氧化镁膨胀剂在大体积混凝土裂缝控制中的应用研究
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摘要
研究氧化镁膨胀剂的膨胀性能及作用机理,配置相应的补偿收缩混凝土,结合原材料优选、施工及养护相关的裂缝控制措施,可整体性提高大体积混凝土筏形基础抗裂及防水性能。掺用氧化镁膨胀剂对高温季节大体积混凝土裂缝控制效果显著。工程实例中筏形基础混凝土浇筑完成28 d后仍处于微膨胀状态,未发现有害裂缝及渗漏现象。
Using shrinkage compensating concrete based on research on mechanism of magnesium oxide expansive agent, combined with selecting of raw materials and crack control measures in construction and maintenance,the cracking resistance and waterproof performance of mass concrete foundation are improved integrally. The results show that magnesium oxide expansive agent has significant effect in crack control of mass concrete constructed in high temperature season. In the application case, foundation concrete is still in expansion state 28 days after construction, no harmful cracks and leakage phenomenon are found.
Using shrinkage compensating concrete based on research on mechanism of magnesium oxide expansive agent, combined with selecting of raw materials and crack control measures in construction and maintenance,the cracking resistance and waterproof performance of mass concrete foundation are improved integrally. The results show that magnesium oxide expansive agent has significant effect in crack control of mass concrete constructed in high temperature season. In the application case, foundation concrete is still in expansion state 28 days after construction, no harmful cracks and leakage phenomenon are found.
引文
[1]赵顺增,游宝坤.补偿收缩混凝土裂渗控制技术及应用[M].北京:中国建筑工业出版社, 2010.
[2]游宝坤.膨胀剂对高性能混凝土的裂缝控制作用[J].建筑技术,2001(1):18–21.
[3]李鹏,苗苗,苗芳,等.补偿收缩混凝土变形性能研究进展[J].硅酸盐通报, 2016, 35(1):192–197,208.
[4]曹丰泽,阎培渝.活性与养护温度对氧化镁膨胀剂膨胀性能的影响[J].硅酸盐学报, 2017, 45(8):1088–1095.
[5]刘加平,王育江,田倩,等.轻烧氧化镁膨胀剂膨胀性能的温度敏感性及其机理分析[J].东南大学学报(自然科学版),2011, 41(2):359–364.
[6]补偿收缩混凝土应用技术规程:JGJ/T 178—2009[S].
[7]大体积混凝土施工规范:GB 50496—2009[S].
[8]李莉华,钱刚毅.大体积混凝土裂缝控制技术在新加坡环球影城项目中的应用[J].建筑技术,2015,46(1):11–12.
[9]张雪斌,李沙沙,年永林,等.MAC-S镁质抗裂剂在超高层大体积混凝土中的应用研究[J].建筑技术,2018,49(7):730–732.
[10]张秀丽,王平凡,赵金玉,等.基于断裂力学的大体积混凝土结构温差应力效应分析研究[J].建筑技术,2017,48(1):44–46.
[11]郝兵,衣丽娇,曹长柱,等.大体积混凝土配合比设计及在高温环境中的应用[J].建筑技术,2017,48(10):1039–1042.
[2]游宝坤.膨胀剂对高性能混凝土的裂缝控制作用[J].建筑技术,2001(1):18–21.
[3]李鹏,苗苗,苗芳,等.补偿收缩混凝土变形性能研究进展[J].硅酸盐通报, 2016, 35(1):192–197,208.
[4]曹丰泽,阎培渝.活性与养护温度对氧化镁膨胀剂膨胀性能的影响[J].硅酸盐学报, 2017, 45(8):1088–1095.
[5]刘加平,王育江,田倩,等.轻烧氧化镁膨胀剂膨胀性能的温度敏感性及其机理分析[J].东南大学学报(自然科学版),2011, 41(2):359–364.
[6]补偿收缩混凝土应用技术规程:JGJ/T 178—2009[S].
[7]大体积混凝土施工规范:GB 50496—2009[S].
[8]李莉华,钱刚毅.大体积混凝土裂缝控制技术在新加坡环球影城项目中的应用[J].建筑技术,2015,46(1):11–12.
[9]张雪斌,李沙沙,年永林,等.MAC-S镁质抗裂剂在超高层大体积混凝土中的应用研究[J].建筑技术,2018,49(7):730–732.
[10]张秀丽,王平凡,赵金玉,等.基于断裂力学的大体积混凝土结构温差应力效应分析研究[J].建筑技术,2017,48(1):44–46.
[11]郝兵,衣丽娇,曹长柱,等.大体积混凝土配合比设计及在高温环境中的应用[J].建筑技术,2017,48(10):1039–1042.