In hot weather, unprotected concrete is subjected to plastic shrinkage cracking. On the other hand, in cold weather the low temperature of concrete curing may seriously impede the rate of strength development. Premature removal of formwork has led to disastrous consequences in terms of both human and economic losses. The problem usually arises when the construction scheduling decisions are based on laboratory-cured cylinders whereas the actual curing history of the in-place field concrete happens to be very different. Construction engineers should have a general understanding of the possible effects of both lower- and higher than normal curing temperatures on properties of concrete at early ages, and the methods of evaluating and controlling them.
In the event of little cement hydration, no strength gain occurs when the concrete is frozen and is kept frozen blow -10 degrees. Therefore, fresh concrete after mixing by a mini cement mixer must be protected from freezing until adequate strength has been gained. Disruptive expansion is also prevented when the degree of saturation of concrete has been sufficiently reduced by some progress in the hydration process. Without an external heat source, the heat of cement hydration in large and well-insulated concrete members may be adequate to maintain satisfactory curing temperatures provided that concrete has been delivered at a proper temperature, and the temperatures of frozen ground, formwork, and reinforcing bars have been taken into consideration.
Improper control of concrete mixtures may large affect the using of concrete, and workers and users should follow the basic production rules to ensure normal production. Aimix Group has rich construction equipment production experience, and welcome to contact us to check our machine if you have the interest.
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