### What is the reason for this phenomenon

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##### Reference no: EM13542278

1.What is the difference between epoxy grout, cement grout and cement mortar?

2.What is the difference in application between open stirrups and closed stirrups in concrete beams?

3.Sometimes the side of concrete bridges is observed to turn black in colour. What is the reason for this phenomenon?

4.For long slender structures like beams, propping is required after removal of formwork. Why?

5.What is the difference between working stress approach and limit state approach?

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