$3.$ Problem $3$

Which ASTM cement type is most appropriate for the following applications? Briefly justify your choice in each case.

a$)$ A massive bridge pier.

b$)$ A pre$-$cast concrete bridge girder, where the forms must be re$-$used every $24$ hours.

c$)$ A concrete slab on grade $($slab lying directly on compacted soil$)$ in California where the SO$4-$level in the groundwater is suspected to be high.