ASTM D7749/D7749M-11(2023)e1 Standard Test Method for Determining Integrity of Seams Produced Using Thermo-Fusion Methods for Reinforced Geomembranes by the Grab Method

用抓斗法测定增强土工膜用热熔解法产生的接缝完整性的标准试验方法

基本信息

标准号

ASTM D7749/D7749M-11(2023)e1

标准状态

现行

发布单位或类别

美国-美国材料与试验协会(US-ASTM);

发布日期

实施日期

废止日期

CCS分类

ICS分类

59.080.70 纺织产品 - 土工布

研制信息

起草单位

- 展开▼

起草人

归口单位

D35.10

摘要

1.1This test method describes destructive quality control tests used to determine the integrity of thermo-fusion seams made with reinforced geomembranes. A test procedure is described that uses seam tests using grab specimens for seam shear strength.1.2The types of thermal field and factory seaming techniques used to construct geomembrane seams include the following:1.2.1Hot Air—This technique introduces high-temperature air between two geomembrane surfaces to facilitate melting. Pressure is applied to the top or bottom geomembrane, forcing together the two surfaces to form a continuous bond.1.2.2Hot Wedge—This technique melts the two geomembrane surfaces to be seamed by running a hot metal wedge between them. Pressure is applied to the top and bottom geomembrane to form a continuous bond. Some seams of this kind are made with dual tracks separated by a non-bonded gap. These seams are sometimes referred to as dual hot wedge seams or double-track seams.1.2.3Extrusion—This technique encompasses extruding molten resin between two geomembranes or at the edge of two overlapped geomembranes to effect a continuous bond.1.2.4Radio Frequency (RF) or Dielectric—High-frequency dielectric equipment is used to generate heat and pressure to form an overlap seam in factory fabrication.1.2.5Impulse—Clamping bars heated by wires or a ribbon melt the sheets clamped between them. A cooling period while still clamped allows the polymer to solidify before being released.1.3The types of materials covered by this test method include, but are not limited to, reinforced geomembranes made from the following polymers:1.3.1Very low-density polyethylene (VLDPE).1.3.2Linear low-density polyethylene (LLDPE).1.3.3Flexible polypropylene (fPP).1.3.4Polyvinyl chloride (PVC).1.3.5Chlorosulfonated polyethylene (CSPE).1.3.6Ethylene interpolymer alloy (EIA).1.4Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.1.5This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.6This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ======4.1The use of reinforced geomembranes as barrier materials has created a need for a standard test method to evaluate the quality of seams produced by thermo-fusion methods. This test method is used for quality control purposes and is intended to provide quality control and quality assurance personnel with data to evaluate seam quality.4.2Values obtained with this method can be correlated to Test MethodD7004/D7004M. The purpose of correlating these methods was for the strength of parent material measured in Test MethodD7004/D7004Mto be comparable to seam strength measured by the test outlined here. The value obtained with this method cannot be compared to values for strip method, Test MethodD7003/D7003M, for parent material or Test MethodD7747/D7747M, strip method for reinforced seams. 1.1该试验方法描述了破坏性质量控制试验，用于确定由增强土工膜制成的热熔接缝的完整性。描述了一种测试程序，该程序使用抓斗试样进行接缝剪切强度的接缝测试。1.2用于建造土工膜接缝的热场类型和工厂接缝技术包括以下几种:1.2.1热空气--该技术在两个土工膜表面之间引入高温空气，以便于熔化。压力施加在顶部或底部土工膜上，迫使两个表面结合在一起形成连续的结合。1.2.2热楔--这项技术通过在两个土工膜表面之间运行热金属楔来熔化它们。向顶部和底部土工膜施加压力以形成连续的粘结。这种类型的一些接缝由非粘合间隙分隔的双轨制成。这些接缝有时被称为双热楔接缝或双轨接缝。1.2.3挤压--该技术包括在两个土工膜之间或两个重叠土工膜的边缘挤出熔融树脂，以实现连续粘合。1.2.4射频（RF）或电介质--高频电介质设备用于产生热量和压力，以在工厂制造中形成重叠接缝。1.2.5脉冲--用金属丝或丝带加热的夹条会熔化夹在夹条之间的薄片。在仍然夹紧的情况下冷却一段时间可以使聚合物在释放之前固化。1.3本试验方法涵盖的材料类型包括但不限于由以下聚合物制成的增强土工膜:1.3.1极低密度聚乙烯（VLDPE）。1.3.2线性低密度聚乙烯（LLDPE）。1.3.3柔性聚丙烯（fPP）。1.3.4聚氯乙烯（PVC）。1.3.5氯磺化聚乙烯（CSPE）。1.3.6乙烯互聚物合金（EIA）。1.4单位--以国际单位制或英寸磅单位表示的数值应单独视为标准。每个系统中规定的值可能不是完全相等的；因此，每个系统应独立使用。将两个系统的值结合起来可能会导致不符合标准。1.5本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。1.6本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。===意义和用途======4.1使用增强土工膜作为屏障材料，需要一种标准的测试方法来评估热熔方法产生的接缝的质量。本试验方法用于质量控制，旨在为质量控制和质量保证人员提供评估接缝质量的数据。4.2使用此方法获得的值可以与测试方法相关联D7004/D7004M.将这些方法关联起来的目的是为了在试验方法中测量母体材料的强度D7004/D7004M与此处概述的试验测得的接缝强度相当。用该方法获得的值不能与条形法、试验方法的值进行比较D7003/D7003M，对于母体材料或试验方法D7747/D7747米，加固接缝的条形法。展开▼

关联标准

代替如下标准

1.ASTM D7749-11(2018) Standard Test Method for Determining Integrity of Seams Produced Using Thermo-Fusion Methods for Reinforced Geomembranes by the Grab Method。

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