1978年在我局天津新港某码头面层混凝土浇筑后不久,即出现局部(约12×1米)疏松破坏的实例,混凝土所用水泥有:本溪矿渣500号、锦西普通500号和朝鲜纯熟料500号三种,水灰比为0.57,混凝土的标号为250～420号不等。有些同志怀疑,所以局部发生破坏是由于进口纯熟料水泥的耐蚀性不良,受浪溅海水的腐蚀所致,并打报告 In 1978, shortly after the concrete was laid on the surface of a certain wharf in Tianjin Port of Xingang in our Bureau, there was an instance of partial (about 12×1 m) loose failure. The concrete used were: Benxi slag No. 500, Jinxi Normal 500 and North Korean pure clinker No. 500, water-cement ratio is 0.57, concrete number is from 250 to 420. Some comrades were skeptical, so local damage was caused by the poor corrosion resistance of imported pure clinker cement, which was caused by the corrosion of seawater splashing, and a report was made.