How to prevent early cracks on concrete surfaces in summer construction
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Update time : 2023-08-16 14:24:09
1. Choose appropriate curing methods, start curing as soon as possible, and keep the concrete surface moist as soon as possible, which can prevent evaporation, reduce shrinkage and ensure the smooth hydration of the concrete surface. For the newly poured concrete with all kinds of curing, try to start curing immediately after the completion of the concrete surface shaping and before the surface water film disappears, but generally can not pollute or damage the formed surface of the concrete, so it is necessary to choose the appropriate maintenance method and the best maintenance start time.
2. Increase the relative humidity of the air Increasing the relative humidity of air can effectively reduce the evaporation rate of water on the surface of the concrete. Spraying water mist on or around fresh concrete is a simple and effective measure with low cost. The simple method of spraying can be set up around the newly poured concrete site or in the upwind direction with a plastic hose with pinholes and form pinhole spray by injecting water with a certain water pressure.
3. Reduce the temperature of concrete Reducing the temperature of concrete can effectively reduce the plastic shrinkage caused by water evaporation on the surface of concrete, prevent the occurrence of thermal cracks, at the same time, reduce the temperature of hardened concrete and reduce the possibility of shrinkage cracks of concrete due to temperature shrinkage. The following methods can be used to cool down: a. Measures such as building a shed protect the newly poured concrete from direct sunlight and reduce the ambient temperature of the concrete surface. b. The temperature of the new concrete mixture is controlled below 32 ℃ by cooling the various composition materials of the concrete.
4. During the construction at night or in the morning, the air temperature is lower at night and in the morning, and the temperature of the foundation or formwork is also lower, so it can effectively reduce the concrete temperature and the water evaporation rate of the concrete surface.
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