Work Item
ASTM WK76666

New Specification for Peel Strength of GCCM Materials

1. Scope

2.1 The scope of the Committee shall be the formulation of test methods, specifications, guides, practices, terminology, and the dissemination of knowledge dealing with geosynthetics. This would include but not be limited to geotextiles, geogrids, drainage nets, drainage composites, geosynthetic clay liners, geosynthetic erosion control products and sediment retention devices, geosynthetic strips, geofoam and geomembranes.
2.2. The formulation of test methods, specifications, guides, practices and terminology for Geosynthetic related products shall be considered by the Committee by establishment of special subcommittees approved by the Executive Subcommittee.
2.3 The work of this Committee will be coordinated with other ASTM committees or organizations having mutual interest.

Keywords

GCCM Peel strength; Peel strength failure; component layer strength

Rationale

A new standard for determining the peel strength of GCCM materials is needed because: i.the current tensile strength test methods do not deal effectively with multiple layer composite materials, and ii.the product is both a supple textile-like material when uncured, then when hardened, it becomes a thin shell-like hard structure. The method of clamping/positioning GCCMs is different compared with current methods, because rather than bending the top and bottom layers so they are clamped perpendicular (90 degrees) to the GCL specimen, back plates are used so a GCCM layer is peeled back parallel (i.e. at 180 degrees) to the specimen. GCCM peel strength should be tested in both uncured and cured states, to include peeling the top layer and individual bottom layers. There are potentially 9 different peel tests of the different components on GCCMs. Finally, for some GCCMs a peel failure occurs as a series of peaks and troughs so calculating mean peel strength alone may not provide sufficient information to understand the peel failure. Reporting a peak force would help understand the load required to tear the connecting fibers. Mean or average peel failure force should also be reported.

The title and scope are in draft form and are under development within this ASTM Committee.

Details

Developed by Subcommittee: D35.05

Committee: D35

Staff Manager: Travis Murdock

Work Item Status

Date Initiated: 04-25-2021

Technical Contact: John Paulson

Item: 001

Ballot: D35.05 (22-01)

Status: Negative Votes Need Resolution