Cured In Place Pipe Rehab
Cured In Place Pipe Rehab
(OP)
I am currently working on a project where we are using a cured in place liner that consists of an unsaturated polyester resin that is used to impregante a tube.
The question I have is that samples taken from the tube in the field and cured in a plate configuration are consistently achieving higher flexural strength results than samples restrained inside of a section of pipe and removed to be tested. The curing is identical, the major difference is that the pipe sample has to be planed to make a flat sample, therefore removing the curvature.
Any ideas?
The question I have is that samples taken from the tube in the field and cured in a plate configuration are consistently achieving higher flexural strength results than samples restrained inside of a section of pipe and removed to be tested. The curing is identical, the major difference is that the pipe sample has to be planed to make a flat sample, therefore removing the curvature.
Any ideas?





RE: Cured In Place Pipe Rehab
RE: Cured In Place Pipe Rehab
I appreciate the response. We have also seen reduction in strength when we don't plane the sample but leave the curvature. Any thoughts on this? Is there any reason to believe that curing the sample inside of a pipe and then releasing it to prepare for testing would lower the strength?
RE: Cured In Place Pipe Rehab
1. The pipe, if made of metal may alter cure of the resin (some metals decompose peroxides)
2. In the pipe I assume one side is open to air and oxygen inhibits cure. In contrast when cured between two plates the oxygen is better excluded