The concrete mix design is performed to ensure that the concrete mix formulation meets or exceeds the specification requirements. The mix design is used to establish the proper proportioning of components (hydraulic cement, aggregates, water, pozzolans, and admixtures) in the mixture to achieve the specified properties. Significant concrete properties are strength, air content, slump, and the coefficient of thermal expansion (COTE). The mix design may be developed for the current project or may have been previously developed. TxDOT developed a document that provides useful information on mix design, production considerations, and testing requirements. Concrete mix design can be facilitated by using the

Mix Design spreadsheet

developed by TxDOT. The mix design must be formally approved by an engineer.