3. Concreting in hot weather
High temperatures (> 30°C) affect concrete at different levels. Firstly, they affect the workability of fresh concrete, then they affect setting and hardening speeds, and finally, they aggravate the consequences of shrinkage.
3.1 Effects on workability of fresh concrete
Any rise in temperature encourages the evaporation of free water from fresh concrete, which naturally lowers its plasticity. This drop in plasticity is measured by consistency tests (slump or spread).
For concrete with a relatively low effective water content, evaporation may restrict the development of hydration reactions. In the latter case, the possibility of slightly increasing the water dosage or adding a water-reducing plasticizer to the mix can be tested beforehand,...
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Concreting in hot weather
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Bibliography
Standards and norms
- Repair and reinforcement of concrete and masonry structures – shotcrete. - NF P 95-102 -
- Project concrete – Part 1: Definitions, specifications and compliance. - NF EN 14487-1 -
- Shotcrete – Part 2: Execution. - NF EN 14487-2 -
- Shotcrete tests – Part 1: sampling of fresh and hardened concrete. - NF EN 14488-1 -
- Shotcrete tests – Part 2: early age compressive strength of shotcrete. -...
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ASQUAPRO – Association for the quality of concrete spraying
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