If setting time is desifed to be reduced, which one of the admixtures should be used?

Superplasticizers

b$)$ Air$-$entraisen

c$)$ Set retaiders

d$)$ Acceleraton

Which one of the statements are reasanable in ferms of adding more admitures in concrete for desinable effects?

a$)$ Adding mote admixtures wouk provide more desinable effects

b$)$ Adding more admixtures would be a cheaper than to add mote oement

c$)$ Adding more admixtures recyare more water coetent

d$)$ Adding more admixtures increase concrete strenyth

What is expected from superplasticizet incorparated conctetes?

a$)$ Increased workability

b$)$ Redused strength

c$)$ Incrcased sir demand

Increased water costent

The effect of accelerators depend on $($Please fill in the blank with the most appeopriate word$)$

a$)$ Dosage

b$)$ Cement type

c$)$ Mix proportions

d$)$ All of the given

What is the maximum quantity of admixture to be added to the concrete doring the mixing under EN $934?$

b$)5\%$ of gravel

a$)5\%$ of cement

d$)5\%$ of sind

c$)10\%$ of cement

What is expected from the chemical admixtures?

b$)$ Difficult carmpaction

a$)$ Increase cost of concrete

d$)$ Reduced dumbility

c$)$ Prevent shrinkage

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