CMAT

Structural Concrete

Involves furnishing, placing, and finishing concrete in various structures according to specifications and plans.

Five Classes of Concrete

Class A for superstructures, Class B for pier shafts and miscellaneous structures, Class C for thin sections, Class P for prestressed members, and Class SEAL for underwater concrete.

Concrete Aggregates

Must meet ASTM standards, with size restrictions based on form dimensions and spacing between reinforcement bars.

Fine Aggregates

Consist of natural or crushed materials, with a minimum strength requirement for use in concrete.

Coarse Aggregates

Comprise crushed stone, gravel, or slag meeting density criteria if used in concrete.

Water

Should be clean and free of harmful substances, with acceptable deviations in setting time.

Metal Reinforcements

Steel bars must meet specified material requirements for concrete reinforcement.

Admixtures

Air-entraining admixtures must conform to ASTM standards, while chemical admixtures and fly ash have specific requirements for concrete use.