Compaction Characteristics of Single-Component Polyurethane Mixtures
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 9
Abstract
To investigate the compaction characteristics of a single-component polyurethane (PU) mixture with dense gradation, the effects of temperature, humidity, catalyst content, and standing time on the compaction energy index (CEI) of the mixture were analyzed in this study. The air void ratio and splitting tensile strength of the polyurethane mixture at 15°C under different compaction times were also tested. Based on the test results, the effects of compaction time on the volume and strength characteristics of the polyurethane mixture were analyzed. The results showed that temperature, humidity, catalyst content, and standing time have significant positive correlations with the CEI, where standing time has the strongest correlation, followed by catalyst content, temperature, and humidity, respectively. A multiple linear regression model relating the CEI and the aforementioned factors was established. Compaction time, as characterized by the CEI, significantly influenced the air void ratio and splitting strength of the polyurethane mixture after curing. If the compaction of the polyurethane mixture is premature or delayed, the void ratio of the mixture increases after curing and the splitting strength decreases. Therefore, an optimal compaction time exists for the single-component polyurethane mixture. At this compaction time, the CEI of the mixture is approximately 600–800. During the process of single-component polyurethane curing, the increase in the adhesive force of polyurethane and the damage to the structure of the mixture, caused by the released , served as a pair of mutually restricting effects, resulting in different volume characteristics and splitting strengths of the polyurethane mixture under different compaction times.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published paper.
Acknowledgments
This work was funded by the Science and Technology Project of the Beijing Municipal Education Commission (Grant No. SQKM201810016003), the Beijing Advanced Innovation Center for Future Urban Design (Grant No. UDC2019032624), and the research project of the National Natural Science Foundation of China (Grant No. 51978035).
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 9 • September 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jul 8, 2020
Accepted: Dec 18, 2020
Published online: Jun 23, 2021
Published in print: Sep 1, 2021
Discussion open until: Nov 23, 2021
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