Long-term creep of encased polymer liners

Due to increasing costs and inconveniences in replacing deteriorated sewer pipelines by conventional excavation methods, the trenchless or 'no-dig' technology is being extensively used. In trenchless technology, a polymer or reinforced polymer is applied to the inside of the deteriorated host pipe to prevent ground water from seeping into the sewer pipelines. In this work, a testing method was developed to determine the long-term creep behavior of encased polymer liners.;Short-term tests, following the ASTM D790 procedure, were conducted on pipe liner samples to determine the initial elastic modulus and compare it to the elastic modulus obtained from long-term testing of the encased liner.;Long-term tests were conducted on 6 ft length, 12 in diameter polymer liner samples encased in steel pipes. Several viscoelastic models were investigated in order to fit the data. The data is used to predict the long-term modulus used in design. (Abstract shortened by UMI.).

Name thesis:degree_name

MS

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Mechanical and Aerospace Engineering

Year dc:date.available

2002

Author dc:creator

• Rangarajan, Shalini

Contributors dc:contributor

• Ever Barbero.

• Mechanical engineering
• Materials science
• Plastics

Identifier

https://researchrepository.wvu.edu/etd/1411

OAI identifier oai:identifier

oai:researchrepository.wvu.edu:etd-2414