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首页> 美国卫生研究院文献>Materials >Evaluation of Sheet-Coated Composite Waterproofing Joint Types by Analysis of Tensile Strength Change and Concrete Displacement Resistance Testing under Environmental Degradation
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Evaluation of Sheet-Coated Composite Waterproofing Joint Types by Analysis of Tensile Strength Change and Concrete Displacement Resistance Testing under Environmental Degradation

机译：通过抗拉强度变化分析和环境退化下的混凝土抗位移试验评估薄板复合防水接头类型

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摘要

Sheet-coated composite waterproofing (SCCW) have been developed to overcome the natural weakness of singly-ply coating or sheet waterproofing systems for roofing, but there are currently multiple types of SCCW joints. Conventional standard tensile strength testing results show that all SCCW joint types seem to pass the minimum requirement and current selection of SCCW type is dictated on the principle of ‘higher tensile strength is better’, but it has not been experimentally studied as to which type is the optimal to respond to environmental degradation while under the effect of zero-span tensile stress occurring during concrete joint displacement. In this study, five types of SCCW joints were tested: Overlap Bond (OB) type, Overlap Heated-Air Welding (OH) type, Butt Joint I Type (BI), Butt Joint T Type (BT), and Butt Joint Separation Movement Type (BS). These types of joint designs were subjected to Alkali, NaCl, and H SO exposure, and temperature change (60 °C and −20 °C) for determining changes to tensile strength in the joint section. Tensile strength change results are compared to joint displacement resistance test results of specimens that were treated with chemical and temperature degradation. With the exception of chemical exposure conditioning, the Overlap type joints generally had higher tensile strength compared to the butt joint types, but joint displacement test results showed the opposite results, suggesting that complex joints found in SCCW require new evaluation method for quality assessment.
机译：为了克服屋顶单层涂料或片材防水系统的天然缺陷，已开发出片材涂层复合防水材料（SCCW），但是目前存在多种类型的SCCW接头。常规标准抗拉强度测试结果表明，所有SCCW接头类型似乎都达到了最低要求，目前选择SCCW接头的原则是“抗拉强度越高越好”，但尚未进行实验研究在混凝土接缝位移过程中出现零跨度拉应力的情况下，对环境退化做出响应的最佳选择。在这项研究中，测试了五种类型的SCCW接头：重叠粘结（OB）型，重叠热空气焊接（OH）型，对接I型（BI），对接T型（BT）和对接分离运动类型（BS）。对这些类型的接头设计进行了碱，NaCl和HSO暴露，然后进行温度变化（60°C和-20°C）以确定接头截面的抗张强度变化。将拉伸强度变化结果与经过化学和温度降解处理的样品的抗接点位移测试结果进行比较。除了化学暴露条件外，重叠型接头通常比对接接头类型具有更高的拉伸强度，但接头位移测试结果却相反，这表明SCCW中发现的复杂接头需要新的评估方法进行质量评估。

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