Reinforced Concrete

In recent years, for concrete unreinforced structures has been applied the method of "cold" concreting, which is as follows: concrete is prepared without heating its components in an aqueous solution of calcium chloride and sodium chloride CaCb high concentration of NaCl and fit into the non-insulated casing. For curing of concrete at ambient temperature to -15 °, for example, the salt concentration should be 9% CaCb and 6% [...]

Reinforced concrete slabs, arches, floors can warm up a special electric furnaces. Last easy to use, are included in the network directly, without transformers. The disadvantages of this method are in danger of overheating, the top layer of concrete due to accelerated evaporation of moisture and increased consumption of electricity. Methods of artificial heating is sometimes combined with the method by thermos insulation formwork. In this case the heating of the concrete [...]

The most rapid hardening concrete is achieved by elektroprogreva when the concrete is included in the electrical network with rod electrodes fabricated from 10-12 mm rebar, plate, or - from the steel strip thickness of 3-4 mm. Rod electrodes are installed before concreting in between clips and pass through the casing in a specially drilled hole. Plate electrodes were sutured to the Shield [...]

When laying concrete in the construction of the module surface to 8 are suitable methods for artificial heating. When paroprogreve fresh concrete prepared on heated components, heated low-pressure steam to 0.7 atm, creating optimum conditions for heat and curing of concrete. The steam is passed into the space between the main and additional fencing formwork (shuttering second), forming a steam jacket around the structure. Steam can [...]

Concrete work in winter conditions must be fulfilled so that the poured concrete to freezing gained strength not less than 50% of the project and not less than 50 kg/cm2. At an early frost does not get concrete design strength. For curing of concrete in winter conditions necessary for it to be stowed in a warm and shuttering all of its component parts have [...]