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采用泵送剂与防冻剂相结合的方法进行负温泵送混凝土施工,关键在于结合实际负温条件如何使得泵送剂与防冻剂的组份与掺量的合理匹配。在1998年11月的航天大厦混凝土冬施中进行了有交往的尝试。1.工程概况航天大厦位于哈市中心的红军街与东大直街转角处,1998年冬施项目为红军街一侧的地下室砼挡土墙,即箱基的侧壁,砼工程量为2000m~3,采取现场搅拌,在100m-200m 的距离上进行泵送,施工时日最高气温为-10℃,最低气温达-28℃,但现场条件有限,无法对水、砂加热到70℃,又加之砼的工程量不大,分段浇注等特点,因此砼浇注后应处于负温下硬化,故采用广义综合蓄热法进行砼冬期施工。2.冬施砼配合比确定2.1基准砼配合比:该挡土墙的砼强度等
Pumping agent and antifreeze combination of the method of negative temperature pumping concrete construction, the key is combined with the actual negative temperature conditions make the pumping agent and antifreeze composition and content of a reasonable match. In November 1998 in the aerospace building concrete winter Shi had a try. 1. Project Overview Space Tower is located in the center of Harbin Red Street and Dongzhidao corner at the winter project in 1998 for the Red Army Street side of the basement concrete retaining wall, that is, the side walls of the box-based, concrete construction capacity of 2000m ~ 3, to take on-site mixing, pumping in the distance of 100m-200m, the maximum temperature during construction is -10 ℃, the minimum temperature of -28 ℃, but the site conditions are limited, not water, sand heated to 70 ℃, and In addition, the amount of concrete is not large, segmented pouring and other characteristics, so after pouring concrete should be at a negative temperature hardening, so the generalized integrated heat storage method for concrete winter construction. 2. winter concrete mix to determine the proportion of 2.1 benchmark mix ratio: the concrete wall strength and so on