Long-Term Buckling Performance of HDPE Liners

• Published in: Journal of materials in civil engineering Vol. 13; no. 3; pp. 176 - 184
• Main Authors: Bakeer, Reda M, Barber, Michael E, Taylor, John E, Pechon, Sean E
• Format: Journal Article
• Language: English
• Published: Reston, VA American Society of Civil Engineers 01-06-2001
• Subjects: Applied sciences; Buildings. Public works; Exact sciences and technology; Hydraulic constructions; Materials; Piping; Plastics; Strength of materials (elasticity, plasticity, buckling, etc.); Structural analysis. Stresses; TECHNICAL PAPERS; Water supply. Pipings. Water treatment; Performance evaluation; Deformation measurement; Creep; High density ethylene polymer; Durability; Experimental device; Lining; Pipe; Experimental study; Buckling
• ISSN: 0899-1561; 1943-5533
• DOI: 10.1061/(ASCE)0899-1561(2001)13:3(176)

This research examines the long-term performance of high-density polyethylene liners frequently used in rehabilitating pipeline networks. Buckling of two groups of samples-each consisting of 20 steel pipes lined with HDPE liners-was examined in the laboratory. Group A was subjected to a uniform external pressure equal to about one-half of the buckling pressure, determined experimentally in a similar short-term test. Group B was subjected to one-third to one-fourth of this short-term pressure. Most liners in Group A failed (buckled) prematurely before the required ASTM period of 10,000-h. However, all 20 samples in Group B sustained the applied pressure for over 10,000 h. It was concluded that a design safety factor of 3 to 4 should be applied to short-term pressure to establish the long-term resistance of a flexible liner. Changes in the liner pipe volume with time, under the uniform pressure, were also monitored to estimate long-term creep in the HDPE material.