What precautions do I have to take during hot-weather concreting?
It is true that hot weather conditions above approximately 25°C (77°F) can adversely impact the quality of concrete. The precautions that should be taken to assure a quality end product will vary depending on the actual conditions during concrete placement and the specific application for which the concrete will be used. In general if the temperature at the time of concrete placement will exceed 25°C (77°F) a plan should be developed to negate the effects of high temperatures. The precautions may include some or all of the following:
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Question and answer courtesy of Portland Cement Association (PCA). More information is available at: http://www.cement.org/tech/cct_faqs.asp.