Artificial Weathering and Cyclic Movement Test Results Based on the RILEM TC139-DBS Durability Test Method for Construction Sealants
Artificial Weathering and Cyclic Movement Test Results Based on the RILEM TC139-DBS Durability Test Method for Construction Sealants
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基于 RILEM TC139-DBS 建筑密封胶耐久性测试方法的人工风化和循环运动测试结果
DOI：
10.1520/jai11605
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
Kyoji Tanaka
中科院分区：
文献类型：
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作者：
H. Miyauchi;N. Enomoto;S. Sugiyama;Kyoji Tanaka
本研究的目的是评估人工风化和循环运动的影响，在实验室测试的基础上RILEM技术建议（RTR）“幕墙接缝密封胶的耐久性测试方法。”对日本使用的11种密封剂进行了测试，包括两种有机硅、两种硅改性聚醚、两种聚硫化物、两种聚氨酯（各为单组分和双组分产品）、一种双组分硅改性聚异丁烯、一种双组分聚氨酯固化丙烯酸和一种单组分水性丙烯酸。两部分聚氨酯，两部分固化丙烯酸，和一部分水性丙烯酸也进行了评估，与和没有油漆的密封剂表面。使用阳极氧化铝和砂浆作为基底材料制备试样;根据制造商的建议，所有密封剂/基底组合均使用底漆。根据方法A调节所有密封剂样本。耐久性测试，包括风化和热机械循环，进行了有和没有疲劳循环的影响。将耐久性循环重复三次。在使用氙弧光源的全自动老化机中进行老化。在耐久性循环的早期阶段，观察到未涂漆的密封剂比涂漆表面的密封剂白垩和开裂，证实了涂漆密封剂表面在保护有机密封剂免受老化方面的有效性。在有和没有疲劳循环的暴露中观察到密封剂行为的实质性差异，证实了疲劳循环在密封剂降解中的重要性。为了在加速老化和实际使用性能之间获得良好的相关性，降解因素的适当平衡至关重要。
The purpose of this study was to assess the effect of artificial weathering and cyclic movement in a laboratory test based on the RILEM Technical Recommendation (RTR) “Durability Test Method for Curtain Wall Joint Sealants.” Eleven sealants being used in Japan were tested, including two silicones, two silicon-modified polyethers, two polysulfides, two polyurethanes — each as one- and two-part products — one two-part silicon-modified polyisobutylene, one two-part urethane cure acrylic, and one one-part water-borne acrylic. The two-part polyurethane, the two-part urethane-cure acrylic, and the one-part water-borne acrylic were also evaluated with and without painting the sealant surface. Test specimens were prepared using anodized aluminum and mortar as substrate materials; primers were used for all sealant/substrate combinations as recommended by the manufacturers. All sealant specimens were conditioned according to Method A. The durability test, consisting of weathering and thermo-mechanical cycling, was carried out both with and without the influence of fatigue cycling. The durability cycles were repeated three times. Weathering was conducted in a fully automatic weathering machine using a xenon arc light source. Sealants without painting were observed to chalk and craze at an earlier stage in the durability cycles than the ones with painted surfaces, confirming the effectiveness of painting the sealant surface in protecting organic sealants from aging. A substantial difference in the behavior of sealants was observed for exposures with and without fatigue cycling, confirming the importance of fatigue cycling in the degradation of sealants. In order to obtain a good correlation between accelerated weathering and actual service performance, a proper balance of degradation factors is essential.