Flexural Toughness Evolution of Modified Secondary Recycled Concrete
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 1
Abstract
In this paper, secondary recycled concrete was modified using basalt fiber (BF) and nanosilica (NS) to form modified secondary recycled concrete (MSRC), to promote the recycling of concrete. The flexural toughness and influence of pore size distribution of the MSRC were analyzed through the four-point flexural mechanics test and nuclear magnetic resonance test, respectively. The results showed that with an increase in the content of BF and NS, the fracture of the coarse aggregate increased and the flexural strength of MSRC increases. According to different evaluation standards, the flexural toughness of the MSRC exhibited a similar trend in different evaluation standards. As the NS content increased, the equivalent flexural strength increased, and as the BF content increased from 2 to , the equivalent flexural strength decreased. Additionally, scanning electron microscope and nuclear magnetic resonance spectroscopy showed that NS and BF had significant influence on the pore structure of the MSRC. When the BF content was , the content of micropores was minimal; and with further increase in BF content, the content of micropores increased, the internal defects increased, and the flexural toughness decreased. Moreover, with the increase in NS content, the content of internal pores decreased and the flexural toughness increased. Therefore, the results showed that BF and NS had a significant toughening effect on the MSRC.
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Data Availability Statement
All data, models, and codes generated or used during the paper appear in the published article.
Acknowledgments
This paper was supported by the Henan Natural Science Foundation (Grant Nos. 182300410134 and 212102310293). We are deeply grateful to Professor Ding Yahong, Liang Weimin, Chu Huaibao, Zhang Juan, Yang Jianhui, and Wei Xiang for their assistance during the experiments.
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Journal of Materials in Civil Engineering
Volume 35 • Issue 1 • January 2023
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© 2022 American Society of Civil Engineers.
History
Received: Aug 26, 2021
Accepted: Apr 21, 2022
Published online: Nov 1, 2022
Published in print: Jan 1, 2023
Discussion open until: Apr 1, 2023
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