混凝土工程冬季施工组织设计方案

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1、混凝土工冬季施工方案吉林市中百利呈建设工程有限公司2015年2月2日共9页，第23页目录1.工程概况················································22.编制依据···············································23.施工准备················································23.1材料准备··············································23.2机具准备

2、··············································23.3人员准备··············································23.4现场准备共9页，第23页··············································23.5技术准备···············································34.施工方法·············································

3、···34.1混凝土的拌制··········································34.2混凝土的运输···········································44.3混凝土的浇筑·········································44.4混凝土的养护·········································65.混凝土的测温···········································6共9页，第2

4、3页5.1测点布置原则·········································65.2测温方法·············································65.3测温要求·············································65.4大体积混凝土养护测温记录·····························65.5混凝土拆模要求·······································76.冬季施工的质量通病以及预防

5、措施························86.1钢筋的锈蚀与混凝土裂缝·······························86.2结构疏散与水分转移共9页，第23页···································86.3表面起灰·············································86.4结晶腐蚀-混凝土表面返霜······························87.安全技术措施·································

6、··········88.质量保证措施···········································9共9页，第23页1工程概况本工程系吉林市城市建设控股集团有限公司开发的办公楼，位于吉林市重庆街南侧，中兴街东侧，总建筑面积约12万m2，其中地下二层，两层总建筑面积约为38080万m2，办公楼地下二层，地上25层，建筑面积约8.2万m²。当室外日平均气温连续5d稳定低于5℃时，就应采取冬期施工的技术措施进行混凝土施工。混凝土所以能凝结、硬化并取得强度，是水泥和水进行水化作用的结果。水化作用的速度在一定湿度条件

7、下主要取决于温度，温度愈高，强度增长也愈快，反之则慢。当温度降至0℃以下时，水化作用基本停止，温度再继续降至-2～-4℃，混凝土内的水开始结冰，水结冰后体积增大8%～9%，在混凝土内部产生冰晶应力，使强度很低的水泥石结构内部产生微裂纹，同时减弱了水泥与砂石和钢筋之间的粘结力，从而使混凝土后期强度降低。受冻的混凝土在解冻后，其强度虽然能继续增长，但已不能再达到原设计的强度等级。共9页，第23页试验证明，混凝土遭受冻结带来的危害，与遭冻的时间早晚、水灰比等有关，遭冻时间愈早，水灰比愈大，则强度损失愈多，反之则损失少。经过试验得知，混凝土

8、经过预先养护达到一定强度后再遭冻结，其后期抗压强度损失就会减少。一般把遭冻结其后期抗压强度损失在5%以内的预养强度值定为“混凝土受冻临界强度”。对用普通硅酸盐水泥的硅酸盐水泥配制的混凝土，受冻临界强度为设计的混凝土强度标准值的30%；