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Case Study on Comparison of Joint Sealant Adhesive Properties Tested in Laboratory and In Situ

机译：实验室和现场测试的联合密封胶粘合性能比较的案例研究

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摘要

The main objective of this case study is to compare whether standardized test methods are able reliably prognosticate the performance of joint sealants and adhesives after installation in a construction. The authors of presented study believe that existing testing procedures intended for testing of bonded and sealed joints do not fully reflect the weather changes exterior surfaces have to withstand. Based on previous experiences a unique geometry of testing sample was used for this purpose allowing the testing of a so-called real joint. A group of test samples was subjected to two normalized test procedures that may influence the resulting behavior of the joint in the exterior. The second group of test samples was exposed to the external environment for a particular period. The obtained results of tests show that the standardized methods are able to simulate an outdoor environment, however, only to a certain level. Unfortunately, these methods do not consider the possibility that the sealed or bonded joint might be damaged already during the application itself. While laboratory environment is clean and often dust free, it is not possible to ensure the same conditions in situ. Moreover, in some cases it was monitored that some of the selected sealants tested in an external environment aged rapidly compared to the ones cured and stored in the laboratory. In some cases, the difference between monitored failure modes for indoor and outdoor environment was substantial. The predominant type of sealant failure observed in-situ was adhesive while mainly cohesive failure was monitored in laboratory.
机译：本案例研究的主要目的是比较标准化的测试方法是否能够可靠地预测安装在建筑中的接缝密封胶和粘合剂的性能。本研究的作者认为，现有的用于测试粘合和密封接头的测试程序无法完全反映外表面必须承受的天气变化。根据以前的经验，为此目的使用了独特的测试样品几何形状，从而可以测试所谓的真实关节。一组测试样品经过两个标准化的测试程序，这些程序可能会影响接头在外部的最终行为。第二组测试样品在特定时期内暴露于外部环境。获得的测试结果表明，标准化方法能够模拟室外环境，但是只能达到一定水平。不幸的是，这些方法没有考虑到密封或粘结接头在施工过程中本身已经被损坏的可能性。尽管实验室环境清洁且通常无尘，但无法在现场确保相同的条件。而且，在某些情况下，与在实验室固化和存储的密封胶相比，在某些外部环境中测试的密封胶的老化速度很快。在某些情况下，室内和室外环境的受监控故障模式之间的差异很大。原位观察到的密封剂失效的主要类型是粘合性，而在实验室中监测的主要是内聚失效。

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