Concrete admixtures allow architects and engineers to alter the concrete recipe for various circumstances. This article covers a number of common concrete additives including superplasticizers, fly ash, corrosion inhibitors, and many others.
FF and FL numbers are used to measure the flatness and levelness of concrete floors. Architects should understand what the numbers mean and how to specify concrete floor flatness and levelness. This article includes recommendations for flatness and levelness based on program type.