混凝土工程冬季施工设计方案

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1、word资料下载可编辑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日专业技术资料word资料下载可编辑目录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现场准备专业技术资料word资料下载可编辑··············································23.5技术准备···············································34.施工方法················································34.1混凝土的拌制··············

3、····························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专业技术资料word资料下载可编辑5.1测点布置原则···································

4、······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措施························86.1钢筋的锈蚀与混凝土裂缝·······························86

5、.2结构疏散与水分转移专业技术资料word资料下载可编辑···································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···········································88.质量保证措施···········································9专业技术资料word资料下载可编辑1工程概况本工程系吉林市城

6、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

7、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。专业技术资料word资料下载可编辑试验证明，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