ISBN 978-0-626-26239-6 SOUTH AFRICAN NATIONAL STANDARD Design, selection and installation of geomembranes Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001 Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS
Table of changes Change No. Date Scope Foreword This South African standard was approved by National Committee SABS SC 59J, Construction standards Waterproofing membranes, films and barrier products for construction purposes, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. A reference is made in 10.1.3.2 to national regulations and statutory requirements on accident prevention. In South Africa this means the Occupational Health and Safety Act, 1993 (Act No. 85 of 1993) (as amended from time to time) and the Electrical Machinery Regulations promulgated in terms of the said Act. Annexes A to I form an integral part of this standard. Reaffirmed and reprinted in July 2011. This standard will be reviewed every five years and be reaffirmed, amended, revised or withdrawn.
Contents Page Foreword 1 Scope... 3 2 Normative references... 3 3 Definitions... 4 4 Use of thermoplastics geomembranes in particular applications, and selection of geomembrane type and thickness... 5 5 Material verification... 6 6 Manufacturing quality control and manufacturing quality assurance... 6 7 Design considerations... 6 8 Construction quality control and construction quality assurance... 8 9 Geomembrane installation... 9 10 Geomembrane field seaming... 12 11 General defects, and repairs procedures... 22 12 General site practice... 23 Annex A (normative) Material delivery/inventory checklist... 25 Annex B (normative) Certificate of acceptance of soil subgrade surface... 26 Annex C (normative) Typical field panel layout drawing... 27 Annex D (normative) Panel placement form... 28 Annex E (normative) Panel seaming form... 29 Annex F (normative) Trial seam information report form... 30 Annex G (normative) Non-destructive testing form... 31 Annex H (normative) Repair report form... 32 Annex I (normative) Field destructive testing form... 33 Bibliography... 34 1
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Design, selection and installation of geomembranes 1 Scope This standard gives requirements and guidance for the design, selection and installation of thermoplastics geomembranes. It also specifies quality control and quality assurance procedures. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this standard. All standards are subject to revision and, since any reference to a standard is deemed to be a reference to the latest edition of that standard, parties to agreements based on this standard are encouraged to take steps to ensure the use of the most recent editions of the standards indicated below. Information on currently valid national and international standards can be obtained from the SABS Standards Division. ASTM D 4354, Standard practice for sampling of geosynthetics for testing. ASTM D 4437, Standard practice for determining the integrity of field seams used in joining flexible polymeric sheet geomembranes. ASTM D 5641, Standard practice for geomembrane seam evaluation by vacuum chamber. ASTM D 5747, Standard practice for tests to evaluate the chemical resistance of geomembranes to liquids. ASTM D 6365, Standard practice for the nondestructive testing of geomembrane seams using the spark test. GRI Test Method GM 6, Pressurized air channel test for dual seamed geomembranes. GRI Test Method GM 14, Standard guide for selecting variable intervals for taking geomembrane destructive seam samples using the method of attributes. GRI Test Method GM 19, Standard specification for seam strength and related properties of thermally-bonded polyolefin geomembranes. NOTE GRI standards are constantly being updated by the Geosynthetic Research Institute (GRI), and the documents are freely available online at website address www.geosynthetic-institute.org/specs.htm. SANS 1526, Thermoplastics sheeting for use as a geomembrane. 3