Concrete Curing and Product Protection Measures

By focusing on controlling the temperature of concrete discharge, temperature rise, and reducing temperature differences, as well as improving construction operation techniques and concrete properties, we aim to lower the temperature of concrete upon entry into the mold, reduce the temperature rise caused by cement hydration heat, and increase the surface temperature of the concrete, thereby decreasing the temperature difference between the inside and outside of the concrete.

(2) Utilizing low-heat cement, such as preferred slag silicate cement; incorporating a certain proportion of fly ash, water-reducing agents, or retarders, etc.

(3) By incorporating an expansive agent, the concrete experiences slight expansion during the initial 14-day moist curing period, compensating for shrinkage cracks caused by early concrete water loss.

(4) Improved aggregate gradation, such as large-volume foundation concrete can incorporate up to 15% of large blocks.

(5) To reduce the exit temperature of concrete, measures such as using mixed water and ice to lower water temperature, spraying shade or cool water on sand and stone aggregates, pre-storing bulk cement, and avoiding excessively high temperatures of newly produced cement have been implemented.

(6) Arrange construction processes for thin-layer pouring, ensuring uniform rise for efficient heat dissipation.

(VII) Large-volume foundation concrete construction can accommodate the installation of cooling water pipes within the foundation, ensuring that the temperature difference between the interior and exterior of the concrete is less than 25°C.

(8) Implement rational joint and block construction; for longer structures, set up post-casting strips. For bedrock or old concrete sublayers, lay a 50~100mm sand cushion on the surface to eliminate the constraints and anchoring effects of the bedrock.

(9) Appropriately configure temperature-reducing rebars to minimize concrete thermal stresses.

(10) Enhance concrete curing by appropriately extending the curing and demolding periods, allowing the concrete surface to cool slowly.