Performace Specification for PT Coating from the Post Tensioning Institute – Unbonded Tendons, used in post tensioning concrete applications, are typically single strands of high strength steel that are coated with an anti-corrosive compound and encased in polyethylene. This specification is for the anti-corrosive compounds used to coat the steel. It consists of the following tests:
ASTM D2265 – Dropping Point
ASTM D6184 (modified) Oil Separation 81C (run in triplicate)
ASTM D95 Water Content
ASTM D92 Flash Point of oil component
ASTM B117 Salt Spray Corrosion 1000 hours
ASTM D512, ASTM D3687, APHA 4500 Water Soluble ions (chlorides, nitrates, sulfides)
ASTM B117 (modified) Soak Test 720 hours
ASTM D4289, ASTM D792, D638 Compatibility with Sheathing (polyethylene)
ASTM D4289, ASTM D792, D638 Compatibility with Sheathing (polypropylene)
ASTM D217 Worked penetration, 60 stroke
ASTM D445 40C Viscosity of oil component
ASTM D4425 Oil Extraction by Koppers to obtain base oil for Flash Point and Viscosity