Selection of Pipe Lining Materials Based on Mechanical Properties

Often, the decision on whether selecting a structural over a non-structural pipe lining option during trenchless design is based on dead and live load requirements, which results only in differences in liner thickness. But other factors, like the proper liner material mechanical properties, are also important where pressure cycles, vibrations, and surge pressures play an important role. In general, the differences in material mechanical properties between structural and non-structural solutions are not considered during liner design. Therefore, the general liner design methodology can be improved when the often-unexplored material mechanical properties are considered. Data from tensile testing allow for interpretation of often unexplored advantages of liner materials made with different material formulations. The complete range of material characteristics discernible in tensile stress-strain curves is explained and discussed for different materials. The basis for a decision support system for liner design is presented.