养护方法

Oiling and moistening forms before pouring concrete aids in curing concrete members with a small surface-to-volume ratio. This preparation helps prevent moisture loss from the freshly cast concrete and facilitates easier form removal. Proper form conditioning ensures better moisture retention during the critical early curing period.

Wet curing concrete is achieved through spraying or fogging water using nozzle systems or by ponding and flooding concrete surfaces with water. Alternatively, covering concrete with moistened sawdust, straw, or saturated moisture-retaining fabrics like wet hessian or cotton mats maintains water-concrete contact. These methods ensure continuous moisture availability during the curing process.

Impervious membranes made of waterproof papers, plastic sheets, or membrane-forming sealing compounds minimize moisture evaporation from concrete surfaces. However, these membranes prevent moisture ingress and cannot replace moisture lost through self-desiccation. They are applied manually or sprayed onto damp concrete to reduce surface water loss.

If concrete forms are removed early, the concrete must be moistened and covered using polyethylene sheets to maintain moisture content. This protective covering prevents rapid evaporation and ensures adequate hydration during the critical curing phase. Early form removal requires immediate protective measures to preserve concrete quality.

A temporary covering is suspended above freshly laid large horizontal concrete surfaces exposed to dry weather until the concrete sets. After the concrete hardens, wet curing is initiated using spraying, fogging, or ponding methods. This staged protection prevents rapid moisture loss during the vulnerable initial setting period.

Immersion in water is the standard curing method for laboratory test specimens of concrete because it provides complete and uniform moisture saturation. This method ensures consistent hydration conditions and allows accurate measurement of concrete properties under controlled curing environments. Water immersion represents ideal curing conditions for standardized testing.

Yes, wooden forms can be left in place for a prolonged period and periodically wetted to prevent moisture loss from the concrete. Keeping forms in place protects the concrete surface and maintains moisture content during curing. If forms are made of suitable materials, they can be an effective moisture-retention strategy.