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Absorption

The increase in weight of a porous solid body resulting from the penetration of a liquid into its permeable pores usually measured as a percentage of dry weight or in pounds per cubic foot.

Accelerators

Admixtures that decrease the setting time by increasing the rate of hydration.

Admixture

A material other than water, aggregates, or cement that is used as an ingredient of concrete or mortar to control setting and early hardening, workability, or to provide additional cementing.

Aggregate

Inert solid bodies such as crushed rock, sand, gravel.