Summer
(June – August): Hot, humid summers are the norm for much of the Northeast. Extreme temperatures are rare. Periodic rain is common, and can occur at any time of the day. Most exterior concrete work takes place during the summer in the high mountain region.
Mix Designs: Dealing with high humidity and warm weather can require the use of admixtures to extend the set time. Hydration stabilizers and water reducers are commonly used to extend the working life of the concrete without affecting performance. Air-entrainment admixtures should be mandatory in all exterior concrete placed in this region.
Placement and Curing Practices: With high humidity and hot temperatures, quick placement is the norm for exterior concrete projects. Surface evaporative control agents should be available on all jobs, whether they are used or not. The use of curing compounds and cure-and-seal chemicals is commonplace for most exterior summer pours. Due to exposure of the hardened concrete to freeze-thaw conditions in winter, it is prone to spalling and scaling. Proper water content and finishing are critical for long-term durability.
Special Equipment: Plastic sheeting to protect concrete from sudden rain showers; sprayers to apply curing compounds and surface evaporative control chemicals.