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混凝土构件洒水养护时,应用草帘等将混凝土覆盖,经常洒水使其保持湿润。普通硅酸盐水泥和矿渣硅酸盐水泥拌制的混凝土,不少于( ) d,掺有缓凝型外加剂或有抗渗要求的混凝土不少于()d。洒水次数以能保证湿润状态为宜。
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