Concrete maintenance, what should be done in summer and winter

Concrete summer maintenance:

1. High pier maintenance:

When the temperature is high in summer, when the high piers are poured in sections, use soft water pipes for the poured sections. Surrounding the pier body, a drainage hole is left on the hose. The hose is connected to the water pump pipe, and water is pumped from the river or reservoir for sprinkling maintenance.

After the concrete for the high pier body and pallet is poured, hoist the water tank to the top of the pallet, use plastic hoses and water pipes to bond them firmly with tape, and wrap the bridge pier body and pallet with plastic film. Finally, use ropes to wrap around the pier body and the pallet to fix it in a circle to prevent the film from cracking in the wind; during the daily maintenance stage, turn on the high-pressure water pump to lead the water to the water tank on the top of the pier and release the water. The water will flow out slowly along the plastic hose around the brim of the pallet.

2. Low pier maintenance:

After the construction of the short pier is completed, hoist the water tank to the top of the pallet, use plastic hoses and water pipes to bond firmly with tape, and the bridge After the pier body and the pallet are wrapped with plastic film, use ropes to wrap around the pier body and the pallet to prevent the film from cracking in the wind; during the daily maintenance stage, turn on the high-pressure water pump to guide the water to the water tank on the top of the pier and release the water along the plastic hose. Slowly flow around the brim of the tray.

3. Cushion stone maintenance:

Spray and cover the surface of the cushion stones, and fill the bolt holes with water for maintenance.

4. Maintenance of the cap platform:

After the initial setting of the cap platform, it is covered with geotextile to retain moisture, and a dedicated person is assigned to sprinkle water for maintenance for more than 7 days.

Winter maintenance of concrete:

1. Heat storage method

The heat storage method uses the heat of preheating of raw materials and the heat of cement hydration to be used around the concrete. Tightly covered with insulation materials to slow down the cooling rate of concrete and gradually harden during the cooling process, this is a construction method that allows concrete to reach critical freezing strength under normal temperature conditions.

2. Additive admixture method

This method is to add an appropriate amount of admixtures during concrete mixing to rapidly increase the strength of the concrete and reach the required critical strength before freezing. Or a method to lower the freezing point so that concrete can solidify and harden at negative temperatures.

3. Electric heating method

Electric heating is a method of heating and curing concrete by converting electrical energy into thermal energy. It belongs to dry heat and high temperature curing.

4. Warm shed method

The warm shed method is to set up a warm shed with insulation materials around the structure or component to be maintained, and use a stove and a hot air fan to provide heat in the shed. Heating methods such as steam pipe heating.

Extended information:

Concrete maintenance methods are:

1. Natural maintenance:

It is divided into water spraying maintenance and spraying plastic film maintenance. The former covers the concrete with straw curtains, etc., and frequently sprinkles water to keep it moist. The curing time depends on the cement type, such as ordinary Portland cement concrete, the curing time should be no less than 7 days and nights.

The latter is suitable for high-rise buildings and large-area concrete structures that are difficult to maintain with water. The perchlorethylene resin plastic solution is sprayed on the concrete surface with a spray gun. After the solution evaporates, a thin film is formed on the concrete surface. Isolate the concrete from the air, prevent the evaporation of water in the concrete and ensure the normal hydration of the cement. After the curing is completed, the film can age and fall off on its own.

2. Steam curing:

Place concrete components in a curing room filled with saturated steam or a mixture of steam and air to accelerate the hardening of concrete in a higher temperature and humidity environment. The curing effect is related to the steam curing system, which includes: standing time before steam curing, heating and cooling speed, curing temperature, constant temperature curing time, relative humidity, etc. Steam curing rooms include pit type, vertical kiln type and tunnel kiln type.

Baidu Encyclopedia-Concrete Maintenance