Here are a few hints on fast, economical ways of avoiding poor concrete when it is being placed during hot weather. Naturally, if any one factor (temperature, wind, or humidity) is unusually severe, it might well be necessary to follow all of the recommendations to avoid low-strength, cracked concrete. Before the first ready mix truck appears on the jobsite a number of steps can be taken to minimize the effects of hot weather: (1) scheduling of concrete deliveries is especially important to the user during hot weather. If this is not done, there will soon be a lineup of trucks at the jobsite broiling under the sun. (2) Order concrete that is tailored to your needs. Concrete that contains a retarding admixture and has one or more of the ingredients cooled may be advisable. (3) Make very sure that the subbase will not absorb water from the mix. This can be accomplished by dampening the subbase. When the concrete arrives, it should be promptly placed and consolidated in the forms. For surfaces requiring finishing, the concrete should be protected form rapid evaporation between the several finishing operations. This may be accomplished by (1) erecting sunshades, (2) covering the concrete with damp burlap or (3) spraying on a product which retards rapid evaporation. Starting curing immediately is especially important. If the curing technique to be used involves a considerable lapse of time between the last troweling and the start of curing, an interim measure such as the use of a membrane curing compound should be taken.