Q: Differentiate between PFA and GGBS in how they work as supplementary cementitious materials $($SCM$)$ and how much cement they can be used to replace in a concrete mix?

Q: Explain why plasticisers are referred to as either $$workability enhancers$$ or $$water reducers$.$ How do each of these roles affect the strength of a concrete mix?

Q: Differentiate between a $$plasticiser$$ and $$super plasticiser$$

Q: Which chemical admixtures are typically used in producing concrete that is to be placed by crane and skip or direct discharge into the form?

Q: Which chemical admixture$($s$)$ are typically used in producing concrete that is to be placed by pump?