Test Method on Adhesive Property of Joint Sealant in Supporting Layer of Ballastless Slab Track
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 10
Abstract
The current test method cannot predict the properties of a joint sealant accurately, and therefore this paper proposes a new test method to evaluate its adhesive property. Field investigation was conducted to examine the main forms of joint sealant failure and its actual working conditions. Our findings enabled us to develop a new test method for evaluating the adhesive properties of sealants. A testing procedure, a standard substrate, and optimal testing parameters were determined in the light of analyses of test results. We conducted differential scanning calorimetry (DSC) and X-ray photoelectron spectroscopy (XPS) tests to research the adhesive mechanism of the sealant. Results showed that adhesive failure is the main failure form, and it is caused mainly by horizontal joint expansion. Using peak load as the standard evaluation index, we noted that quartz substrate has the weakest bonding interface with joint sealants. The adhesive strength of sealants has a positive correlation with the isocyanate index and elongation rate, and a negative correlation with temperature. The optimal elongation rate was determined to be , at which there is good repeatability and stability. Sealants with high isocyanate index can present two glass transition points and react more easily with , but may also result in a rougher surface that could reduce the chemical interaction between polyurethane and .
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Data Availability Statement
All data used during the study are available from the corresponding author by request.
Acknowledgments
This study was supported by the National Natural Science Foundation of China (Grant No. 51908055) and the Fundamental Research Funds for the Central Universities (No. 300102219103). The authors appreciate their financial support.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 10 • October 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: May 9, 2019
Accepted: Oct 21, 2019
Published online: Aug 4, 2020
Published in print: Oct 1, 2020
Discussion open until: Jan 4, 2021
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