Detail of CJ/T 234-2006

Introduction of CJ/T 234-2006

High density polyethylene geomembrane for landfills 1 Scope This standard specifies the classification, requirements, test methods, test frequency, marking, labeling, packaging, transportation and storage of HDPE geomembrane for landfills. This standard is applicable to the HDPE geomembrane produced by using medium (high) density polyethylene resin as the main raw material and adding various additives, which is used in seepage control and closure in landfills. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions of, any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies. GB/T 1033 Test method for density and relative density of plastics GB/T 1037 Test method for water vapor transmission of plastic film and sheet — Cup method GB/T 1040 Plastics — Determination of tensile properties GB/T 2918 Plastics — Standard atmospheres for conditioning and testing GB/T 5470 Test method for brittleness temperature of plastics by impact GB/T 6672 Plastics film and sheeting — Determination of thickness by mechanical scanning GB/T 6673 Determination of length and width of plastics film and sheeting GB/T 7141 Plastics — Methods of exposure to thermal air GB/T 9352 Plastics — Compression moulding test specimens of thermoplastic materials GB/T 11116 High density polyethylene resin GB/T 12027 Plastics — film and sheeting — Determination of dimensional change on heating GB/T 13021 Determination for the carbon black content of polyethylene pipes and fittings by calcination and pyrolysis GB/T 15182 Linear low density polyethylene resin GB/T 16422.3 Plastics — Methods of exposure to laboratory light sources — Part 3: Fluorescent UV lamps GB/T 17391 Test method for thermal stability of polyethylene pipes and fittings QB/T 1130 Test method for right angle tearing property of plastics 3 Terms and definitions 3.1 geomembrane waterproof barrier material using polymer as primary raw material, such as polyethylene (PE) geomembrane, polyvinyl chloride (PVC) geomembrane, chlorinated polyethylene (CPE) geomembrane and various composite geomembranes 3.2 high density polyethylene (HDPE) geomembrane geomembrane made from medium (high) density polyethylene resin with a density of 0.94 g/cm3 or higher 3.3 smooth geomembrane geomembrane with smooth and flat appearance on both sides 3.4 textured geomembrane geomembrane manufactured by specific processes to present uniform coarse appearance on one side or both sides 3.5 tensile strength maximum tensile stress (kN/m) per unit width applied on a specimen until it breaks during a tensile test 3.6 tensile break stress tensile stress at break of a specimen 3.7 tensile yield stress stress at the tensile stress-strain yield point 3.8 offset yield stress stress generated when the stress-strain curve deviates from linearity and reaches a specified strain percentage (offset)   3.9 elongation at break ratio of the increase of the distance between markings to the initial marked distance, at break under the action of tensile force, in percentage 3.10 tensile stress-strain curve graph drawn through corresponding values of stress and strain; usually, the stress is considered as the ordinate and the strain value as the abscissa 4 Classification 4.1 Classification 4.1.1 Smooth high density polyethylene geomembrane, code-named HDPE1. 4.1.2 Textured high density polyethylene geomembrane, code-named HDPE2, of which single textured high density polyethylene geomembrane, code-named HDPE2-1; double textured high density polyethylene geomembrane, code-named HDPE2-2. 4.2 Model

Contents of CJ/T 234-2006

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