Foamed concrete indoor backfilling project

Concrete curing and finished product protection methods and measures

(1) By focusing on controlling the concrete discharge temperature, temperature rise, and reducing temperature differences, as well as improving construction techniques and concrete properties, we aim to lower the concrete pouring temperature and the temperature rise caused by cement hydration heat. Additionally, we seek to enhance the surface temperature of the concrete and reduce the internal and external temperature differences in the concrete.

(2) Utilize low-heat cement, such as slaggy silicate cement as a priority; mix 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 large-volume foundation concrete may contain up to 15% of rubble stones.

(5) To lower the concrete's discharge temperature, measures such as using mixed water with ice to reduce water temperature, spraying sunshade or cool water on sand and gravel aggregates, pre-storing bulk cement, and avoiding excessively high temperatures of newly produced cement are adopted.

(6) Arrange construction processes for thin-layer pouring to ensure even rise for better heat dissipation.

(7) Large-volume foundation concrete construction: Cooling water pipes can be embedded within the foundation to ensure the internal and external temperature difference of the concrete is less than 25°C.

(8) Reasonably divide and construct with gaps, and for longer structures, set a post-casting groove; for bedrock or old concrete sublayers, lay a 50~100mm sand pad on the surface to eliminate the constraints and anchoring effects of the bedrock.

(9) Appropriately configure temperature reinforcement to reduce concrete temperature stress.

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