Comments

910.07.04.01 “Fusion welding of ducts in not permitted.” - Does it also affects mirror welding?

910.04.02.05 “Test results shall be provided for relaxation testing of prestressing steel bars for the same heat number as the material supplied for the work” - Does it also apply to strand?

910.05.01.02 “Primary tendon anchorages shall be multi-plane bearing type.” Read more

910.05.02.01 “The diameter of a duct, or an equivalent diameter of a non-circular duct, shall not exceed 40% of the least gross concrete section thickness at the location of the duct.” - This requirement is a structure design requirement, not a PT system requirement

910.05.02.02 “Corrugated duct shall have at least 2 longitudinal flow channel ribs throughout the cross section. “ Read more

910.05.03.01 “The pre-packaged dry grout mixtures shall be used within 6 months of packaging and shall be stored on site for a maximum of 1 month” - duration on site should be increased to 6 months, with proper storage conditions 910.06.02 Grouting equipment Read more

910.07.01 “Personnel employed or licensed by the manufacturer of the post-tensioning system shall carry out the work” - we recommend an external certificate such as PTI level 1 as minimum

910.07.05.01 “For anchorages and couplers, samples shall be selected by the Contract Administrator on a random basis.” - very unspecific. How many? Sizes? For what purpose?