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Peachtree City, GA

Concrete is a proportioned mix of sand, gravel, water, portland cement, and various additives depending on your region and the time of year. Concrete is perishable - once it is 'slumped', or mixed together, concrete will become unworkable in 3 to 6 hours without any accelerators or retarders. Adding water at the jobsite to make the concrete more workable is a standard practice in the industry; however, excessive water will weaken the concrete.