The process of placing and curing concrete in hot weather is usually called moisture curing. There are two types. One for hot-arid and one for hot-humid environments.
Hot-arid environments are the ones you usually need to worry about. Water is poured onto the surface as needed to keep just enough water to reflect for the first day. After that, you add water until it is visibly wet for the next two days. Many contractors will place tarps, burlap, or straw to limit evaporation. After the third day, it would be allowed to cure naturally unless otherwise directed by the engineer.
Hot-humid environments tend to be less of an issue unless it is above 90F. The surface of the concrete should be periodically checked for drying, bubbles, or unusual separation or striation of the concrete. Generally, water is poured on the surface to cool the concrete. In rare cases, ice may be placed on the surface, but usually, cooled water works well enough. (Don’t use fans or blowers as they will dry the surface too quickly.) Again, after three days the concrete is usually left to cure naturally.
MKDesign 