Date of Graduation
Statler College of Engineering and Mineral Resources
Mechanical and Aerospace Engineering
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.).
Rangarajan, Shalini, "Long-term creep of encased polymer liners" (2002). Graduate Theses, Dissertations, and Problem Reports. 1411.