大体积混凝土温度裂缝的控制措施有哪些

2025-04-06 14:48:10
推荐回答(1个)
回答1:

  (1)降低混凝土入模温度。
  浇筑大体积混凝土时应选择较适宜的气温,尽量避开炎热天气浇筑。可采用温度较低的地下水搅拌混凝土,或在混凝土拌和水中加入冰块,同时对骨料进行遮阳保护、洒水降温等措施,以降低混凝土拌和物的入模温度,掺加相应的缓凝型减水剂。
  (2)加强施工中的温度控制。
  在混凝土浇筑之后,做好混凝土的保温保湿养护,以使混凝土缓缓降温,充分发挥其徐变特性,减低温度应力。应坚决避免曝晒,注意温湿,采取长时间的养护,确定合理的拆模时间,以延缓降温速度,延长降温时间,充分发挥混凝土的“应力松弛效应”;加强测温和温度监测。可采用热敏温度计监测或专人多点监测,以随时掌握与控制混凝土内的温度变化。混凝土内外温差应控制在25℃以内,基面温差和基底面温差均控制在20℃以内,并及时调整保温及养护措施,使混凝土的温度梯度和湿度不致过大,以有效控制有害裂缝的出现。
  (3)提高混凝土的抗拉强度。
  控制集料含泥量,砂、石含泥量过大,不仅增加混凝土的收缩而且降低混凝土的抗拉强度,对混凝土的抗裂十分不利,因此在混凝土拌制时必须严格控制砂、石的含泥量,将石子含泥量控制在1%以下,中砂含泥量控制在2%以下,减少因砂、石含泥量过大对混凝土抗裂的不利影响。改善混凝土施工工艺,加强早期养护,提高混凝土早期及相应龄期的抗拉强度和弹性模量,在大体积混凝土基础表面及内部设置必要的温度配筋,以改善应力分部,防止裂缝的出现。

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