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Precautions for foam concrete maintenance

Precautions for foam concrete maintenance

Precautions for foam concrete maintenance

Foamed concrete is a new type of building material that has developed rapidly in recent years. It is quite different from traditional concrete in all aspects. Therefore, foamed concrete also has its own specific methods for maintenance. Specific introduction:

1. Cover watering and maintenance

Covering and watering maintenance is to cover the concrete with appropriate materials such as straw curtains, reed mats, sack, sawdust, wet soil and wet sand within 3-12 hours after the foamed concrete is poured, and water it frequently to keep it moist.

①The curing date of foamed concrete shall not be less than 7 days and nights for the concrete mixed with Portland cement, ordinary cement and slag cement.

②The use of retarding admixture or concrete with impermeability requirements shall not be less than 14 days and nights.

③When bauxite cement is used, it shall not be less than 3 days and nights.

④ The number of watering per day can keep the concrete sufficiently wet. When the temperature is above 15°C, the concrete should be watered at least once every 3 hours during the day and at night during the 3 days and nights after the concrete is poured. After watering twice, in the future maintenance, watering at least about 3 times a day (of course, when the temperature is dry, you can appropriately increase the number of watering).

⑤For larger areas (or volumes) of concrete, "water storage and maintenance" should be adopted. For the reservoirs and other projects, the inner mold can be removed and the concrete can be watered and cured after the concrete reaches a certain strength; for underground structures or foundations, it can be started again. The surface is painted with asphalt emulsion or backfilled with soil instead of sprinkling water for curing.

2. Plastic film curing

Plastic film curing refers to the use of a plastic film covering to separate the concrete from the air, so that the water is not evaporated, and the cement is cured by the water in the concrete to complete the hydration. This method can directly cover the plastic draft on the surface of the concrete, or spray the plastic emulsion on the surface of the concrete member. After the emulsion evaporates, it is combined into a layer of plastic film on the concrete surface to make the concrete member and the air Separate, so that the water in the concrete will no longer evaporate and complete the hydration. The disadvantage of spraying plastic film curing is that the 28d concrete strength is about 8% lower, and because the film is thin, it cannot fully achieve the effects of heat and freezing, so in summer, this method is to add sun protection facilities ( Not less than 24h), otherwise it will cause filiform cracks in the foam concrete.

3. Matters needing attention

① Within 72 hours of pouring the foamed concrete, it is strictly forbidden to trample on it;

② During the maintenance period, it is not allowed to wear spiked shoes to walk on, not to pile heavy objects, not to pull carts on it, and not to drill holes on it to install pipes, brackets, etc.;

③After the completion and acceptance of the insulation layer, the protective layer should be made in time to prevent damage to the insulation layer during the pouring and backfilling of the protective layer. Drilling holes in the completed insulation layer should be avoided. If it is necessary to drill holes, The damaged insulation layer should be keyed and sealed;

④After delivery, the load on the foam concrete should not exceed its compressive strength (1.2-1.5Mpa).

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