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近年来,水电工地混凝土机口样品强度超过设计要求强度过多的现象,比较普遍。例如:某水电站压力引水隧洞的钢筋混凝土衬砌,设计要求混凝土28天强度为200公斤/厘米~2,而全洞分段机口取样平均超强达46.25～93.8%。某双曲高拱坝已浇坝体混凝土的一部分机口样品平均强度,超过设计要求达100公斤/厘米~2以上。混凝土超强过多,并不是一件有利的事。从结构物对混凝土强度的要求来说,不需要过多的超强;而从总的分析来看,过多的超强反而会带来一系列不利的后果。造成混凝土超强过多的一个重要因素是多
In recent years, the intensity of concrete samples at the hydropower site exceeds the design requirements, which is more common. For example, the reinforced concrete lining of the pressure diversion tunnel of a hydropower station requires that the concrete strength for 28 days should be 200 kg / cm 2, while that of the entire tunnel sub-section should average 46.25-93.8%. The average strength of a part of double-curvature high-arch dams that have been dams dammed at the port has exceeded the design requirements of 100 kg / cm ~ 2. Excessive concrete is not a good thing. From the structure of the concrete strength requirements, do not need too much super; and from the overall analysis, the excess super but will have a series of adverse consequences. One of the most important factors that cause excess concrete is excessive