Winterization measures of construction concrete

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1) The use of antifreeze: antifreeze can greatly reduce the freezing point of the mixing water, to avoid freezing expansion of the water inside the concretein the plastic condition and the early stage, and frostbite concrete. Antifreeze has no significant harm to the strength function of concrete, but some antifreeze contains urea, and the concrete releases ammonia smell for a long time, requiring special attention.

2) Insulation: as far as possible, the use of plywood, wood and other formwork with certain insulation effect, with insulation materials such as quilts, curtains or foam insulation board to cover the surface of the exposed concrete and wrap the steel formwork, so that the strength of concretequickly developed. In winter construction, it is best to use early-strength silicate or general Portland cement, because the strength is fast and the heat of hydration is relatively high. However, as long as the insulation is done, what cement can be used, the strength is slower, and it is better to avoid thermal stress cracks. At the lowest temperature 2° C environment, pouring concretecan not use antifreeze, but it is necessary to do a good job of insulation, and pay close attention to the temperature change trend. If the temperature will drop, it is necessary to strengthen the concrete insulation and pay close attention to the temperature change trend. If the temperature will drop, it is necessary to strengthen the concrete insulation.

Small pump truck winter construction according to different temperatures, adopt different construction methods, so that concrete in winter construction, according to the concretestrength grade, structural thickness, construction season and maintenance conditions change to meet the quality standards of concrete construction.

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