How to maintain concrete in summer and winter?

1, high pier maintenance:

When the temperature is high in summer, when the high pier is poured in sections, soft water pipes are used to surround the pier body in the pouring section, and drainage holes are left on the hoses, which are connected with the water pump pipes, and water is pumped from the river or reservoir for maintenance.

When pouring concrete for high piers and pallets, lift the water tank to the top of the pallet, and firmly bond the plastic hose and water inlet pipe with adhesive tape. After the piers and trays are wrapped with plastic film, ropes are wound around the piers and trays to prevent the film from cracking in the wind. In the daily maintenance stage, the high-pressure water pump is turned on to lead the water to the water tank at the top of the pier, and the water slowly flows out around the edge of the tray along the plastic hose.

2, low pier maintenance:

After the short pier construction is completed, the water tank is hoisted to the top of the tray, and the plastic hose is firmly bonded with the water supply pipe with adhesive tape. After the piers and pallets are wrapped with plastic film, they will be fixed around them with ropes to prevent the film from cracking in the wind. In the daily maintenance stage, the high-pressure water pump is turned on to lead the water to the water tank at the top of the pier, and the water slowly flows out around the edge of the tray along the plastic hose.

3, cushion stone maintenance:

Spray and cover the surface of the cushion stone, and fill the bolt hole with water for maintenance.

4, pile caps maintenance:

After the initial setting, the pile caps shall be covered with geotextile for moisture retention, and shall be watered by special personnel for more than 7d.

Winter curing of concrete;

1, heat storage method

Thermal storage method is a construction method that uses the preheating heat of raw materials and hydration heat of cement to tightly cover the concrete with thermal insulation materials to delay the cooling rate of concrete and gradually harden during the cooling process. It is a construction method for concrete to reach the critical strength of freezing at room temperature.

2, admixture method

When mixing concrete, this method is to add an appropriate amount of admixture to make the strength of concrete increase rapidly, reach the critical strength required before freezing, or lower the freezing point, so as to make concrete set and harden at negative temperature.

3. Electrothermal method

Electric heating is a method of heating and curing concrete by converting electric energy into heat energy, which belongs to dry heat and high temperature curing.

4. Warm shed method

The greenhouse method is to build a greenhouse around the structure or component to be maintained with thermal insulation materials, and heat it in the form of raw stove, hot air blower and steam pipe.

Extended data:

Concrete curing methods are:

I. Nature protection:

Divided into sprinkler maintenance and plastic film spraying maintenance. The former covers concrete with straw curtains, etc. , and often sprinkle water to keep wet. The curing time depends on the type of cement, such as ordinary portland cement concrete not less than 7 days and nights.

The latter is suitable for high-rise structures and large-area concrete structures that are not easy to be cured by water spraying. The perchloroethylene resin plastic solution is sprayed on the concrete surface with a spray gun, and a film is formed on the concrete surface after the solution volatilizes, so that the concrete is isolated from the air, the water in the concrete is prevented from evaporating, and the normal hydration of cement is ensured. After maintenance, the film can age and fall off by itself.

Second, the steam curing:

Concrete members are placed in curing rooms filled with saturated steam or a mixture of steam and air to accelerate the hardening of concrete in high temperature and high humidity environment. The curing effect is related to the steam curing system, including: standing time before steam curing, heating and cooling speed, curing temperature, constant temperature curing time, relative humidity and so on. Steam curing room has pit type, vertical kiln type and tunnel kiln type.

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