What are the rules for mass concrete pouring?

Article 13.7. 1 1 in Technical Specification for Concrete for Building Structures (JGJ3-2002) stipulates that the difference between the internal temperature and the surface temperature of mass concrete and the difference between the external surface temperature of concrete and the ambient temperature should not exceed 25 degrees Celsius. Try to reduce the temperature of concrete entering the mold.

Main measures to control cracks in mass concrete;

1, low hydration heat cement should be used for concrete, and retarding water reducer and micro-expansive agent should be used appropriately to reduce the influence of volume shrinkage of mass concrete and the possibility of concrete cracking.

2. On the premise of ensuring the design strength of concrete, appropriately reduce the water-cement ratio and add a proper amount of fly ash to reduce the cement consumption.

3, reduce the concrete into the mold temperature, control the temperature difference between inside and outside the concrete (no design requirements, control within 25 degrees Celsius), such as reducing the mixing water temperature, washing the aggregate with water to cool down, to avoid exposure.