巴基斯坦某护岸大体积混凝土开裂风险评估及裂缝控制技术
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摘要
热带海洋环境条件下,为防止护岸大体积混凝土发生开裂导致结构外观和耐久性下降,通过对结构进行开裂风险评估分析,确定外约束引起大体积混凝土开裂风险较小,导致护岸大体积混凝土开裂的主要因素是混凝土的内约束;在不能降低混凝土入模温度的情况下,通过加密冷却水管布置并采用有限元仿真计算,确定该措施可以抑制混凝土的开裂;混凝土浇筑后采取严格的保温、保湿、防风养护措施,拆模后半年内混凝土未出现任何裂缝。
Under the condition of tropical marine environment,in order to prevent revetment mass concrete crack from resulting in the appearance and durability of structure decline,through analyzing the structure of cracking risk assessment,the risk of cracking of mass concrete caused by external constraint was small,the main factors resulted in the revetment mass concrete cracking was internal constraint.Under the condition that the temperature of concrete entering mold can not be reduced,through the arrangement of encryption cooling water piping and finite element simulation calculation,the measure which could inhibit the cracking of concrete was sure.Taking strict maintenance measures of heat preservation,moisturizing and wind-proof after pouring concrete,concrete didn′t appear any crack not yet after template removal in half a year.
Under the condition of tropical marine environment,in order to prevent revetment mass concrete crack from resulting in the appearance and durability of structure decline,through analyzing the structure of cracking risk assessment,the risk of cracking of mass concrete caused by external constraint was small,the main factors resulted in the revetment mass concrete cracking was internal constraint.Under the condition that the temperature of concrete entering mold can not be reduced,through the arrangement of encryption cooling water piping and finite element simulation calculation,the measure which could inhibit the cracking of concrete was sure.Taking strict maintenance measures of heat preservation,moisturizing and wind-proof after pouring concrete,concrete didn′t appear any crack not yet after template removal in half a year.
引文
[1]余倩,等.循环水冷却系统用于大体积混凝土裂缝控制应用研究[J].混凝土,2015(1):158-160.
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[3]王铁梦.工程结构裂缝控制[M].北京:中国建筑工业出版社,2007.
[4]大体积混凝土施工规范:GB 50496-2009[S].
[5]水运工程大体积混凝土温度裂缝控制技术规程:JTS 202-1-2010[S].
[6]江正荣,朱国梁.简明施工计算手册(第三版)[M].北京:中国建筑工业出版社,2005.
[7]朱伯芳.大体积混凝土温度应力与温度控制(第二版)[M].北京:中国水利水电出版社,2012(8).
[2]冯乃谦,等.混凝土结构的裂缝与对策[M].北京:机械工业出版社,2006(6).
[3]王铁梦.工程结构裂缝控制[M].北京:中国建筑工业出版社,2007.
[4]大体积混凝土施工规范:GB 50496-2009[S].
[5]水运工程大体积混凝土温度裂缝控制技术规程:JTS 202-1-2010[S].
[6]江正荣,朱国梁.简明施工计算手册(第三版)[M].北京:中国建筑工业出版社,2005.
[7]朱伯芳.大体积混凝土温度应力与温度控制(第二版)[M].北京:中国水利水电出版社,2012(8).