Semi-low density Concrete
Semi-low density Concrete
(OP)
An 18 m span post-tensioned beam in a 40 year old above grade open air parking garage requires repair due to soffit delamination caused by corrosion of bottom bars. The corrosion was caused by past leakage at an expansion joint which has been fixed several years ago. The original concrete was semi-low density at 115 pounds per cubic foot (pcf), according to the original drawings which we have. The added weight of the normal density repair concrete versus the semi-low density concrete is not an issue, since the weight of repair concrete is very small relative to the total load. We know that special care is required because of the un-bonded tendons.
Question:
Is there any significant compatibility issue with using normal density concrete at 145 pcf for the repair of the beam that has 115 pcf concrete?
Question:
Is there any significant compatibility issue with using normal density concrete at 145 pcf for the repair of the beam that has 115 pcf concrete?






RE: Semi-low density Concrete
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.