1.Under what situation shall engineers use jacking at one end only and from both ends in prestressing work?
2.If a contractor proposes to increase concrete cover beyond contractual specification (i.e. 40mm to 70mm), shall engineers accept the proposal?
3.If on-site slump test fails, should engineers allow the contractor to continue the concreting works?
4.Is it desirable to use concrete of very high strength i.e. exceeding 60MPa? What are the potential problems associated with such high strength concrete?