1. Winter construction of the requirements of concrete materials
Aggregate: aggregate may be ice, snow and organic matter, should be clean, well graded, hard texture (concrete batching plant);
Water: drinking tap water;
Admixture: selection of antifreeze, mechanism of antifreeze is in negative temperature under the provisions of the decrease of concrete liquid freezing, make concrete is not frozen in liquid, ensure the hydration of the cement, get the expected strength in a certain period of time, antifreeze should be through technical expertise, quality standards and the laboratory the performance test;
Cement: Ordinary portland cement with high activity and high hydration heat.
2. Winter concrete mixing and transport requirements
Concrete mixing:
Methods of heating water mixing concrete, 80 degrees above the water shall not be in direct contact with the hot water and cement, aggregate cement concrete mixing and stirring, to avoid false set of cement, concrete mixing time shall not be less than 3 minutes. In addition, it is necessary to protect the mixer around and through the warm insulation. (concrete batching plant)
Curing of concrete:
Concrete pouring is completed immediately covered with plastic sheeting to maintain moisture, while the plastic outer covering is insulation, insulation is the cover should be neat, tight, make concrete temperature does not drop too fast, to avoid the occurrence of frost damage of concrete. Properly extend the time of concrete curing, in order to not less than 15 days is appropriate.
3. Winter concrete temperature measurement requirements
In the concrete electrical wire dedicated for temperature measurement, including air temperature, concrete tank, temperature, casting temperature of concrete, such as abnormal take timely measures. (concrete batching plant)