Temperature Control

Chilled water is 10 – 100 X more cost effective than alternative cooling methods for the same temperature reduction. AmGeo provides the highest quality equipment and services to maximize safety, efficiency and profitability for concrete producers operating in extreme conditions.

Concrete temperature specifications have become increasingly challenging for producers on high-spec projects. It is especially important that concrete producers keep a close eye on temperature during the heat of summer. When cement and water mix in concrete, a chemical process called hydration occurs. Hydration is an exothermic reaction that emits heat additional heat into the concrete mixture. Concrete mix design constituents are naturally warmer as ambient temperatures increase, and the heat of hydration combined with extreme temperatures can result in a concrete mixture that sets before cement molecules fully hydrate. While hot concrete will set faster and gain initial strength more quickly, the desired long-term strength and durability of the concrete may be compromised due to insufficient hydration.

Mass concrete projects present situations where internal and external concrete placement temperature differentials must be minimized and monitored. Some projects use specific size limits to define mass concrete, but in AC116R, the American Concrete Institute defines mass concrete as “any volume of concrete with dimensions large enough to require that measures be taken to cope with generation of heat from hydration of the cement and attendant volume change to minimize cracking.” And ACI301 states “the maximum temperature in mass concrete after placement shall not exceed 160 °F (70 °C); and the maximum temperature difference between center and surface of placement shall not exceed 35 °F (19 °C).”  It’s crucial that concrete producers adhere to guidelines set forth by the American Concrete Institute to produce quality concrete.

The most effective way to meet concrete placement temperature requirements during hot weather placements is to pre-cool the mix constituents prior to batching. Of the four ingredients (cement, sand, stone and water), water is always the easiest, cheapest and most effective place to start even though it contributes the smallest volume to the concrete mix. On average, concrete batched with 35°F water results in an 8-10°F temperature drop for less than $00.20 per cubic yard.  Compare that to ice or liquid nitrogen!