Pouring concrete in special circumstances

Pouring concrete in special circumstances.Many had to face the problem of performing concrete screed, especially in the winter. Pouring concrete in winter differs significantly from such work, which is carried out in the summer, and requires knowledge of some features. Another school lessons from physics it is known that water at subzero temperatures, takes the form of a solid, i.e. ice becomes, which is several times the volume of water becomes greater. Thus, when concrete is poured water in the winter in the usual way, a part of the solution freezes, it stops the process of solidification and forms in conjunction breaks. Particularly harmful to concrete are temperature changes. Over, we can not say that there is no any setting, but after repeated thawing and freezing pouring concrete into the formwork can give a zero result. How did produce concrete work in cold weather? Working with solutions to create a tie in the first place should be carried out general rules that exist in the building. You must perform two claims. Firstly, to create ties need to prepare high-quality, compliance concrete. When sending it to a place better to use a concrete pump. In addition, the builder lays the responsibility for the preparation of future space to fill and for further care for the concrete. That the solution is well hardened, which will provide about 75 percent of its strength, should create conditions for the preservation temperature. And for high-quality solid ties pouring concrete in temperatures of 10 degrees above zero. Therefore, work on the production of screed must be performed in a warm room, which have walls, roof and heating. When pouring concrete in place is made with ambient temperature of 5 degrees (this is the minimum rate at which the cement can work, but at the time of curing times increase) should take the following actions. Firstly, for the inhibition of freezing using additives for concrete or chemical additives (not recommended to create a tie). Concrete must be poured into the formwork, which is first necessary to insulate. Formwork can hide roofing felt, mineral wool, solomitom, kamyshitom, and between the boards to fall asleep slag, sawdust or foam to fill the space. Can be used for heating infrared sources of heat. Besides, fillers heated: water, sand or gravel. From this it follows that the best way to ensure the normal hardening of the solution and the necessary microclimate is the use of the curtain, and the application of heat source, if necessary, including electric or gas heat guns. It must be remembered on how to use heating equipment. Improperly installed heat gun will do more harm one area ties may dry, and the second – freeze. If the pouring of concrete shall be subject to the conditions and with the continued support (about 4-5 days) the thermal regime, for its quality can not worry. Sometimes it happens that the concrete freezes. Can recover its solidification, creating zero temperature (not less than 10 degrees). This often happens during the autumn frosts. But in this case, you can not worry about such significant harm to the cold concrete will not do. Can destroy only the top thin layer. If the tie is frozen, the urgent need to cover it with plastic thick film to frost and thaw did not destroy the concrete. In this case the strength is somewhat lower, but this is only an upper layer. According to the materials of the website “The secret garden” www.secretdachi.ru Tips and Tricks cottages.