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某粮库的大型屋面板采用原国标 G410先张法生产,外形尺寸为1.5m×6m。混凝土强度等级为 C30,预应力筋为Φ~l18。施工单位将其分包给一家有资质的预制厂进行预制。现场有一简易混凝土蒸汽养护室,构件养护制度为:静停3h,升温3h,恒温5h,降温2h,恒温温度为90℃。构件在混凝土强度达到设计强度等级标准值的75%时放张。自
A large grain warehouse roof panels using the original national standard G410 Zhang pre-production, dimensions of 1.5m × 6m. Concrete strength grade C30, prestressed tendons Φ ~ l18. The contractor subcontracts it to a qualified prefabricated plant for prefabrication. Site has a simple concrete steam curing room, component maintenance system: static stop 3h, heating 3h, constant temperature 5h, cooling 2h, constant temperature of 90 ℃. The members are released when the concrete strength reaches 75% of the design strength grade standard value. from