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How to maintain concrete in summer?

Source: unknown popularity: Time of publication: 16:08, July 6, 2020
 How to maintain concrete in summer
 

   How to maintain concrete in summer? The key is to make clear the purpose and essence of maintenance. When the purpose is clear, the method will be available. These methods can effectively prevent the loss of mixing water and completely eliminate the water loss defects. In summer, when the sun is scorching, the concrete loses water fastest and hardens quickly. For large area concrete, after vibration compaction and leveling, close attention should be paid to master the secondary plastering and pressing time before initial setting.

If the appropriate plastering time is missed, the quality of hardened concrete will be irretrievably affected. During the second time of plastering and pressing, it is necessary to cover at the same time and pour enough water to keep wet. Troweling is to completely eliminate the water loss defects formed before initial setting, and covering is to prevent the concrete from losing water after plastering and pressing. The best way to cover is to use sacks or geotextiles with strong water absorption, which should be connected with each other and keep the covering always in a saturated state. Only in this way can water loss be effectively prevented. Covering plastic film is a faster and more labor-saving method, but attention should be paid to its water loss prevention effect. Case: a project in a certain place was constructed in the summer of 2018, and the technical disclosure of the mixing plant may not be clear enough. The construction unit covered the plastic film according to the technical disclosure, and serious early cracking occurred. The final treatment result was that the floor slab was knocked off and poured again, and the concrete company suffered losses.

It is speculated that the old and thin film was covered at that time, and it was not close to the concrete surface. There was a large gap between some places and the concrete surface. Under the scorching sun, the concrete lost water quickly, and the water evaporated or evaporated through the film, or adhered to the film as small water droplets, or lingered between the concrete surface and the film as steam. This evaporated water does not cure concrete as some data suggest, because it cannot prevent the concrete from losing water in the hot sun.

There is no doubt that the concrete will crack if there is more water loss. Serious water loss and cracking. Therefore, the covering film should be airtight and impermeable and relatively thick. After one or two times of plastering and pressing, it should be immediately covered on the concrete surface, and the film should be pressed tightly to make it adhere to the concrete surface, so that the mixing water is difficult to evaporate.
 

 How to maintain concrete in summer
 

If the sun is very strong, for important projects, or mass concrete, after the completion of plastering and covering, it is better to store water for maintenance, so as to ensure the quality.

Especially in summer concrete construction in water shortage areas, there is no enough water to maintain large area of concrete. After the second plastering and pressing, it is better to float a splash on the concrete surface to make the concrete surface fully wetted, and then cover the surface with impermeable and impermeable film, and then cover the surface with dry straw mat or dry gunny bag, which should be connected with each other, leaving no exposed surface and avoiding the film from being directly exposed to the sun bake. Since then, although no longer drenching water, it should also have a better crack prevention effect. This is a maintenance method for water shortage areas. Do not let the compacted concrete exposed to the sun for a long time, allowing its water loss.

Another feature of the construction in summer is that there is a lot of rain. Sometimes the rain comes very quickly and fiercely. Due to high temperature in summer, the slump of pumped concrete is usually large, but the slump should be as small as possible during construction in rainy season. The concrete with low slump has strong ability to keep slurry in rain, which can reduce the loss of slurry washed by rain. Before the arrival of heavy rain, we should make a judgment as soon as possible, and cover the vibrated and flattened concrete with plastic film.
 

 How to maintain concrete in summer
 

Due to the delay, some construction units only cover the vibrated and flattened concrete, but not the vibrated concrete. This is the opposite. There are many footprints on the concrete that has not been vibrated. After the heavy rain, these footprints are filled with rain water. Before vibration, the water is not removed, and it is difficult to remove it. In addition, the water loss of concrete is greatly affected by the water cement ratio.

If the rain comes fast and there is no time to cover all the concrete, the first thing to be covered is the concrete that has not been vibrated. For the concrete that has been vibrated and smoothed, the periphery must be covered well, so that the membrane is close to the surface of the surrounding concrete, so as to prevent the rainwater from washing away the cement slurry. When the concrete is vibrated and plastered, it is better to press the surrounding slightly higher to let the rainwater accumulate on the concrete surface. In this way, it plays the role of "instant water conservation". The construction unit did according to this method, the effect is still good.

In short, the maintenance methods are flexible and diverse. Different construction units may have different maintenance methods. To judge whether a maintenance method is reasonable, whether it can meet the needs of concrete growth and development, and whether it can guarantee the quality of hardened concrete depends on whether it can effectively prevent the loss of mixing water and completely eliminate the water loss defects.

If this effect is achieved, the purpose of maintenance will be achieved. It should also be noted that different components may have different ways of water loss, and corresponding measures should be taken to prevent water loss. The purpose of curing discussed in this paper is to provide necessary conditions for normal growth and development of concrete. No matter what kind of component in any season, as long as the mix proportion is reasonable, as long as these conditions are met, we can guarantee the quality of hardened concrete under normal hardening temperature, and its durability quality will also be improved.
 


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