In hot weather concrete with fly ash or slag will set a bit slower. But using admixtures to control set and slump is more common and does not lower the quality of the concrete or change its color. In the July 2002 issue of
Concrete appli ions may be considered hot weather concrete at temperatures ranging from 77 to 95 degrees Fahrenheit depending on the specific appli ion. Precautions should be planned in advance to counter the effects of
Extreme weather conditions extreme heat or cold and humidity variations can significantly alter the quality of concrete. In hot weather concreting one should make sure that all the negative impacts of high ambient temperature are appropriately alleviated by taking the necessary precautions.
3.1—Potential problems in hot weather 3.2—Potential problems related to other factors 3.3—Practices for hot weather concreting Chapter 4—Effects of hot weather on concrete properties p. 3 4.1—General 4.2—Estimating 4.3
ACI 305 “Hot Weather Concreting” defines hot weathers as any combination of the following conditions that tends to impair the quality of the freshly mixed or hardened concrete: The success of many hot-weather
Ready mix producers in hot climates use chilled water or ice to lower the concrete temperature. & 34;We have an evaporative cooler that turns on at 2:00 a.m.& 34; says Frank Kozeliski president of Gallup Sand and Gravel a ready-mixed concrete producer in Gallup N.M.
The properties of concrete that may be affected by hot weather include: Consistence – The slump/flow/slump flow of concrete reduces more rapidly. Adding water to improve the consistence shall decrease the concretes compressive strength potentially increase permeability and ultimately affect the durability of the structure.
Hot weather creates special challenges for precasters and technically speaking there are more obstacles to overcome when placing concrete in hot weather than in the cooler seasons. By understanding how heat humidity and