Is it worth while to cool aggregates for use in hot weather concreting?
The most effective way to cool concrete mixes in hot weather is by using cold water or ice for mixing water. Nevertheless, it may be more convenient and often adequate for the purpose to cool the aggregate. Sometimes it is sufficient to shield stockpiles from the direct rays of the sun. Sprinkling the stockpile periodically, especially if the humidity is low, cools the aggregate by evaporation. If a stockpile is being built up in hot weather it is helpful to sprinkle the successive layers. Aggregate can also be cooled by immersing it in artificially cooled water or forcing refrigerated air through the bins. Any last minute changes in moisture content of aggregates must be taken into account and adjustments made in mix water proportions.