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Temperature are managed in 3-steps
1. Understanding chemical reaction process of heat of hydration,
² Manage required W/C ratio, more will increase heat of hydration & other issues & lesser with compensation of water reducers like polycarboxylate ethers will delay hydration process.
2. Manage material temperature, like aggregate, sand, water & cement.
² Require use of ice for water, Aggregate, sand, & cement stored in shades, etc
3. Environment temperature is major factor,
² In hot climate suitable time is early morning or after midnight is suitable time,
² Moisten surface, steel reinforcement, and form work prior to concrete placement.
² Control & limit wind velocities and sunshades to reduce concrete surface temperatures.
² Using accelerator admixtures in hot weather conditions substantially shorted the times to initial and final set & for rapid placement and consolidation.
² Cover with plastic sheets to maintain initial moisture.
² Curing as soon as possible after the concrete finishing processes have been completed.
² Lot of things depends on QC expert.
by using ice in fresh concrete and after casting curing and cover it
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Protection of concrete from the sun
By adding ice to avoid evaporation of water from the concrete
Concrete and cooling after casting moisture water
(Use of materials slowed down to freezing (Retarders
- use the good water cement ratio in mix design.
- you can also use special type of cement.
- put the used material in shadow .
- Avoid excessive mixing time
