Re: cement types
PPC or PSC are the ideal Cements for Construction of Dams or any Irrigation Structures. Because it evaluate less heat and more durable than OPC.
In case of Bridges both OPC & PPC/PSC are suitable. OPC helps in early removel of shuttering and centering / demoulding. But, in view of durability PPC/PSC Cements are the best.
Hope it is clarified.