Since the cement in the concrete mix is mostly calcareous material and will evolve heat during the hydration process when meets with water, thus the temperature of the green concrete must be under control to avoid it being too high, particularly in the hot season. The temperature control could be by means of the combination of, or the following: –
1. Cool down the temperature of the newly arrived cement before use.
2. The coarse and fine aggregates are to be stockpiled under shelter.
3. The batching process is to be carried out in the morning.
4. Addition of ice cubes.
5. Addition of chilled water.
Before placing the ready mixed concrete into the final position, it should be tested with a laboratory standard certified ( or calibrated ) mercury thermometer ( shielded with metal casing ) with an accuracy of at least 0.5 degrees Celsius. The acceptance of temperature range is to be in compliance with the Specification for various work and / or grade of concrete. Bear in mind to provide a few calibrated thermometers on site as these instruments are quite easily broken.