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。描述了使用条形试样进行剥离和剪切性能接缝试验的试验程序。 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 本标准源于对评估加固土工膜接缝的破坏性试验方法的需要。 为非增强土工膜的破坏性测试编写的标准不包括所有断裂代码( 图1 )适用于加固土工膜。 图1 在剪切和剥离模式下测试接缝强度的增强土工膜双热楔和热空气接缝的断裂代码 4.3 当加固发生在机器和交叉机器以外的方向时，在试样边缘切割粗布，通常会降低结果。为了部分弥补这一点，可以根据测试方法进行测试 D7749 或者可以使用该方法中指定的2英寸宽的条形试样。1英寸和2英寸试样的测试分别采用方法A和方法B。 4.4 本方法中概述的剪切试验与根据试验方法测量的母体材料强度相关 D7003/D7003M 只有当钢筋平行于TD时。对于其他材料，接缝强度和母材强度可以通过试验方法进行比较 D7749 和 D7004/D7004M 用条带法获得的数值不得与用抓取法获得的值进行比较。

1.1 This test method describes destructive quality control tests used to determine the integrity of thermo-fusion seams made with reinforced geomembranes. Test procedures are described for seam tests for peel and shear properties using strip specimens. 1.2 The types of thermal field and factory seaming techniques used to construct geomembrane seams include the following: 1.2.1 Hot 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. 1.2.2 Hot 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. 1.2.3 Extrusion— This technique encompasses extruding molten resin between two geomembranes or at the edge of two overlapped geomembranes to effect a continuous bond. 1.2.4 Radio Frequency (RF) or Dielectric— High-frequency dielectric equipment is used to generate heat and pressure to form an overlap seam in factory fabrication. 1.2.5 Impulse— 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. 1.3 The types of materials covered by this test method include, but are not limited to, reinforced geomembranes made from the following polymers: 1.3.1 Very low-density polyethylene (VLDPE). 1.3.2 Linear low-density polyethylene (LLDPE). 1.3.3 Flexible polypropylene (fPP). 1.3.4 Polyvinyl chloride (PVC). 1.3.5 Chlorosulfonated polyethylene (CSPE). 1.3.6 Ethylene interpolymer alloy (EIA). 1.4 Units— 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. 1.5 This 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. 1.6 This 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 ====== 4.1 The 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. 4.2 This standard arose from the need for a destructive test method for evaluating seams of reinforced geomembranes. Standards written for destructive testing of nonreinforced geomembranes do not include all break codes ( Fig. 1 ) applicable to reinforced geomembranes. FIG. 1 Break Codes for Dual Hot Wedge and Hot Air Seams of Reinforced Geomembranes Tested for Seam Strength in Shear and Peel Modes 4.3 When reinforcement occurs in directions other than machine and cross-machine, scrim are cut at specimen edges, generally lowering results. To partially compensate for this, testing can be performed according to Test Method D7749 or the 2 in. wide strip specimen specified in this method can be utilized. Testing of 1 in. and 2 in. specimens is Method A and Method B, respectively. 4.4 The shear test outlined in this method correlates to strength of parent material measured according to Test Method D7003/D7003M only if reinforcement is parallel to TD. For other materials, seam strength and parent material strength can be compared through Test Methods D7749 and D7004/D7004M . Values obtained with the strip methods shall not be compared to values obtained with grab methods.