Reasonably determine concrete strength grade C20 a C25 is generally appropriate. By 46 to 90 GB Guardian provides design strength of concrete mixed with fly ash can be used 60 to 90 days strength, you can greatly reduce the amount of cement unilateral, therefore, reduces the heat of hydration, reduces the adiabatic temperature rise of concrete, to prevent early cracks have effective control action.
  Mass concrete pouring temperature control project. Center temperature inside the concrete including concrete pouring temperature and the age of the adiabatic temperature rise is not concrete. Therefore, the temperature of the concrete center level have a direct impact with the concrete pouring temperature. Control the center temperature is not too high, not only consider adiabatic temperature rise should be considered pouring temperature, pouring temperature should be controlled generally clever one 20 ℃ degrees as appropriate.
  Center of mass concrete pouring and surface temperature with different thickness change its law center thickness greater the higher the temperature, the greater the relative surface temperature. General Concrete Concrete Centre each additional ZO0mm its relative increase in temperature of about 10, the surface temperature increased by 2 ℃. While its center temperature and surface temperature also varies with temperature level, the law is the atmospheric temperature is lower, the greater the temperature difference between the inner and outer.
  Under the same conditions, the temperature difference between the surface of the concrete center and slightly cold and cold areas in contrast to a difference of 4 5 ℃ so. In cold areas, massive concrete construction should pay attention to the removal of the insulation cover and have a good time with insulation and cooling rate, in order to prevent cracks.