{"id":{"repo_id":"wvu","oai_identifier":"oai:researchrepository.wvu.edu:etd-2414"},"canonical_url":"https://search.dev.ndltd.org/etd/wvu/oai:researchrepository.wvu.edu:etd-2414","repository":{"repo_id":"wvu","name":"West Virginia University","base_url":"https://researchrepository.wvu.edu/do/oai/"},"display":{"title":"Long-term creep of encased polymer liners","abstract":"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.).","abstract_html":"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.).","abstract_has_math":false,"creators":["Rangarajan, Shalini"],"institution":null,"degree_name":"MS","degree_level":"Thesis","degree_discipline":"Mechanical and Aerospace Engineering","degree_department":null,"school":null,"contributors":["Ever Barbero."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2002,"date_issued":"2002-08-01T07:00:00Z","date_published":"2002-08-01T07:00:00Z","updated_at":"2026-07-24T06:15:40Z","subjects":["Mechanical engineering","Materials science","Plastics"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["https://researchrepository.wvu.edu/etd/1411"],"render_values":[{"text":"https://researchrepository.wvu.edu/etd/1411","href":"https://researchrepository.wvu.edu/etd/1411","code":true}]}]},"links":{"outbound_url":"https://doi.org/10.33915/etd.1411","outbound_label":"DOI","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Ever Barbero."]},{"key":"dc:creator","label":"Author","values":["Rangarajan, Shalini"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.available","label":"Dc Date Available","values":["2019-01-17T08:00:00Z"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Mechanical and Aerospace Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["MS"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Mechanical engineering","Materials science","Plastics"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://doi.org/10.33915/etd.1411","https://researchrepository.wvu.edu/etd/1411"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["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.)."]},{"key":"dc:title","label":"Title","values":["Long-term creep of encased polymer liners"]}]}],"canonical_facts":{"dc:contributor":["Ever Barbero."],"dc:creator":["Rangarajan, Shalini"],"dc:date.available":["2019-01-17T08:00:00Z"],"dc:description.abstract":["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.)."],"dc:identifier":["https://doi.org/10.33915/etd.1411","https://researchrepository.wvu.edu/etd/1411"],"dc:subject":["Mechanical engineering","Materials science","Plastics"],"dc:title":["Long-term creep of encased polymer liners"],"thesis:degree_discipline":["Mechanical and Aerospace Engineering"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["MS"]},"updated_at":"2026-07-24T06:15:40Z"}