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Mixing, Placing and Curing Concrete

Concrete Curing for Moisture Retention

Description

Concrete curing for moisture retention helps fresh concrete keep the water it needs as it hardens. For members with a small surface-to-volume ratio, the forms are often oiled and moistened before the concrete is placed. These forms may stay in place for a long time to reduce moisture loss. If the form material can be wetted,...

Transcript

在浇筑混凝土之前对模板进行涂油和润湿,有助于养护表面积与体积比较小的混凝土构件。

这些模板若为木质,可保留一段时间并保持湿润;若提前拆除,则需对混凝土进行洒水并用聚乙烯薄膜覆盖。

在干燥天气条件下,新浇筑的大面积水平混凝土表面需在混凝土初凝前覆盖防护层,随后进行湿养护。 

使用喷嘴系统喷洒或喷雾水,或对混凝土表面进行蓄水或淹水处理,有助于潮湿养护。

或者,用湿润的锯末或稻草覆盖混凝土,或使用湿麻布、湿棉垫等饱和保水材料覆盖,这些材料需定期洒水,或在其上覆盖聚乙烯薄膜,以确保水与混凝土的接触。

在混凝土表面施加不透水膜可减少水分蒸发,但同时会阻止水分渗入。这些不透水膜可由防水纸、塑料薄膜或成膜型密封化合物制成,可通过人...