Effect of Silane Coupling Agent on Improving Adhesive Property between Acidic Aggregate and Hydraulic Asphalt
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 7
Abstract
Silane coupling agents (SCAs) are a type of antistripping agent for improving the adhesive property between acidic aggregate and hydraulic asphalt. To evaluate the modified effect, find the optimal dosage of SCA, and study the modified mechanism at different dosages, the surface free energy (SFE) component, energy parameters, and the energy ratio were used to analyze the energy required in the asphalt-aggregate-water three-phase transformation. Additionally, the functional group index of organosilane and hydroxyl were used to evaluate the SCA binding effect at the asphalt–aggregate interface using Fourier transform infrared (FTIR) spectra. The results showed that with the increase of SCA, the SFE and FTIR parameters almost increased initially, reached the maximum at the 1.0% by weight, and then decreased. This indicates that the SCA can serve as a molecular bridge to improve the adhesive property between acid aggregate and hydraulic asphalt with the optimal dosage of 1.0% by weight. Insufficient SCA could not modify the adhesive property effectively, and excess SCA led to the hydrogen-bond association and SCA depolymerization, resulting in an adverse effect.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The research described in this paper was funded by the National Natural Science Foundation of China (Grant No. 52039008), the National Natural Science Foundation of China (Grant No. 51722907), the National Natural Science Foundation of China (Grant No. 51979224), the National Natural Science Foundation of China (Grant No. 51909215), and funding from the State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi’an University of Technology (Grant No. 2018KFKT-14).
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 7 • July 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Aug 7, 2020
Accepted: Dec 4, 2020
Published online: May 6, 2021
Published in print: Jul 1, 2021
Discussion open until: Oct 6, 2021
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