concrete curing

Hot Weather Concreting

As the weather heats up it’s time to introduce hot-weather practices during concrete placement. Such practices typically involve using cooling mists, moist curing, retarding admixtures, low temperature mix water and even ice.

Self-Desiccating Concrete

Moisture-related flooring problems have become a thorn in the sides of many  architects, contractors, and building owners. The failures are typically caused by left-over batch water (known as water of convenience) or moisture vapor from the subgrade. Groundwater is rarely a significant factor. The excess moisture vapor mixed with highly sensitive (that is, water-tight) floor coverings creates a situation where flooring materials blister, bubble and delaminate entirely.

Tech Bulletin No. 6 - Hot-Weather Concrete Practice

Evaporation Rate Nomograph

In case you thought winter would never end—look out, summer is here!

With it comes a change in concrete practice. Temperature, humidity and wind create challenges to proper placement and curing.

The Evaporation Rate Nomograph (shown above) is a tool developed by the NRMCA in 1960 to combat rapid-drying problems such as plastic shrinkage cracking. The example line in light blue shows the steps and variables needed to determining evaporation rate.

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