SYMPOSIA PAPER Published: 20 May 2022
STP163320200045

Assessment of the Damage to Sealed Joints of MS-2 and PU-1 in a Simultaneous Test of Composite Deterioration Due to Ultraviolet Rays and Joint Movement

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In the present paper, a small displacement-controlled fatigue testing device that weighs about 1 kg was used, which was developed to assess fatigue resistance of sealed joints. We conducted simultaneous complex deterioration tests with ultraviolet (UV) radiation and joint movements to assess damages to sealed joints. In addition, we assessed damages to sealed joints when joint movements were added during the curing process. The small fatigue testing device consists of three parts: a displacement regulator part that repetitively applies specific deformation to sealants, a load measurement part by load cells, and a part load that is captured by a computer. Sealants were a one-component polyurethane sealant and a two-component modified silicon sealant. Deterioration factors that incur damage to joints in a simultaneous complex deterioration test with UV radiation and joint movements were separate deterioration factors and simultaneous complex deterioration factors of UV radiation and joint movements, respectively. The results showed that complex deterioration factors of UV radiation and joint movements allowed for the re-creation of damages similar to those that occurred after a long-term exposure in a very short period of time compared with separate deterioration factors. This test demonstrated a possibility of a screening method that allows for a short-time preliminary evaluation as opposed to the accelerated durability test device that requires a long period of time. The state of damage to the sealed joints when movement was added to the joint during the curing process varied depending on the curing mechanism of the sealant. However, it was confirmed that the damage could be improved by using a breathable material such as a backup material to the joint base even for ones with severe damage. In addition, depending on the temperature condition during the curing process, stress relaxation characteristics can be changed.

Author Information

Miura, Naobumi
Auto Chemical Ind. Co., Ltd., Institute of Technology, Ibaraki, JP
Miyauchi, Hiroyuki
Building Research Institute, Dept. of Building Materials and Components, Ibaraki, JP
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Details
Pages: 195–211
DOI: 10.1520/STP163320200045
ISBN-EB: 978-0-8031-7713-0
ISBN-13: 978-0-8031-7712-3