- Admixture
- Substance ( other than cement , water aggregates or rebar ) added during or immediately before mixing to improve / Alter the properties of concrete ( eg . accelerators )
- -note : doses are usually very small ( less than 1 % )
- Effect very sensities to variation in dose
- side effect
- Additive
- Substance added by cement manufactureres to midify properties of cement ( eg. Gypsum )
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