Curing and protection measures for concrete products

(1) By controlling the concrete discharge temperature, temperature rise, and reducing temperature differences, as well as improving construction operation processes and enhancing concrete properties, we aim to lower the concrete pouring temperature and the temperature rise caused by cement hydration heat. Additionally, we strive to increase the surface temperature of concrete and reduce the internal and external temperature differences of the concrete.

(2) Utilize low-heat cement, preferably slag silicate cement; blend in a certain proportion of fly ash, water-reducing agent, or retardant, etc.

(3) Incorporating an expansive agent, during the initial 14-day moist curing period, causes the concrete volume to slightly expand, compensating for shrinkage cracks resulting from early concrete water loss shrinkage.

(4) Improve aggregate gradation, such as for large-volume foundation concrete, up to 15% of rubble stone can be added.

(5) To reduce the concrete's exit temperature, measures such as lowering water temperature by mixing water with ice, spraying sunshade or cool water on sand and stone aggregates, and pre-storing bulk cement to avoid excessive temperature of newly manufactured cement are taken.

(6) Properly arrange construction sequences for thin-layer pouring to ensure even rise for easy heat dissipation.

(7) Large-scale foundation concrete construction can accommodate chilled water pipes within the foundation, ensuring the temperature difference between the interior and exterior of the concrete is less than 25°C.

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

(9) Properly configure temperature-reducing reinforcing steel to minimize concrete temperature stress.

(10) Enhance concrete curing, extend curing and demolding times appropriately, allowing the concrete surface to cool slowly.