For this reason regular cement is required to be at least 5 % furnace slag in Japan, while in Holland the concrete dykes that keep the sea at bay contain cement of up to 70 % furnace slag.
基於此，日本便規定普通水泥需添加百分之五的爐石；與海爭地的荷蘭，所建造混凝土海堤也使用爐石含量高達百分之七十的水泥。