STP1081

    The Effects of Seaming on the Durability of Adjacent Polyethylene Geomembranes

    Published: Jan 1990


      Format Pages Price  
    PDF Version (164K) 11 $25   ADD TO CART
    Complete Source PDF (7.1M) 11 $55   ADD TO CART


    Abstract

    Several stress cracking failures in the liners of fluid waste impoundments have been observed in and adjacent to all types of seams in polyethylene geomembranes. The majority of these cracks occur at the outer edge of extruded fillet and lap seams and the inside edge of hot wedge seams. Stress cracking is the predominant mechanism that presently compromises the long-term durability of polyethylene geomembrane and that, in cold weather, may initiate spectacular, rapid crack propagation failures. Each type of polyethylene resin has its own fundamental stress cracking characteristics, which can be modified by the time/temperature history during manufacture of the geomembrane and, subsequently, during seaming. This paper reports the results of a preliminary series of constant tensile load tests using single edge notched specimens to determine the effects on stress crack growth rates of different types of seams in different polyethylene geomembranes. The influence of microstructure on stress cracking is also assessed.

    Keywords:

    stress cracking, polyethylene, geomembrane, seams, liners, crack growth rates, brittle failures


    Author Information:

    Peggs, ID
    presidentphysical laboratory technician, GeoSyntec, Inc., Boynton Beach, FL

    Carlson, DS
    presidentphysical laboratory technician, GeoSyntec, Inc., Boynton Beach, FL


    Paper ID: STP19028S

    Committee/Subcommittee: D35.10

    DOI: 10.1520/STP19028S


    CrossRef ASTM International is a member of CrossRef.