Long Term Material Design Properties for Polypropylene Pipe Grade Resins
Bill Vanhoose, Jeff Biesenberger
Papers # 2010 Vancouver
While polypropylene (PP) has been widely used in corrugated sewer pipe production in
Europe for the past 25+ years, high-density polyethylene (HDPE) remains the dominant
material for corrugated sewer pipe production in North America. As such, both short
term and long term material design properties have been established for pipe grade
(HDPE) for use in American Association of State Highway and Transportation Officials
(AASHTO) Load and Resistance Factored Design (LRFD) Section 12 Design
With the investigation into the use of PP in North America, came the need for long-term
material design limits for use in the AASTHO strain based design. While short term
material properties are readily available, long-term properties such as 100-year modulus
of elasticity, 100-year ultimate tensile strength, and strain limit are less known and
specifications for determination of material properties poorly defined.
This paper describes test protocols established for material property determination
including Stepped Isothermal Method (SIM) testing for modulus and ultimate tensile
strength determination, evaluation of design stress for modulus predictions, and physical
product compression stub testing for establishing design strain limits.
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