Mechanical Performance and Acoustic Emission Characteristics during Fracture of Strain-Hardening Cementitious Composites with High-Content Fly Ash
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 1
Abstract
The emergence of strain-hardening cementitious composites (SHCCs) improves brittle cracking of concrete materials. SHCC has the characteristics of strain hardening and multiple cracking under tensile load. In this study, 10 groups of SHCC were developed by incorporating polyvinyl alcohol (PVA) fiber into cement-based materials with high-content fly ash. Testing variables included water/binder ratio, sand/binder ratio, fly ash and cement content, and sand particle. The tensile test on the thin-plate specimen and compression test on cylindrical specimen were carried out. In addition, the double-edge notched plate specimens with relative notch lengths of 0.2, 0.4, and 0.6, respectively, were tested. The results showed that the average ultimate tensile strain of SHCC was 403 times that of ordinary concrete, and the peak compressive strain was about four times higher than ordinary concrete. The ultimate tensile strain of SHCC with high-volume fly ash ratio is generally higher than the low-volume fly ash ratio group. The failure mode of SHCC was ductile with good energy dissipation. Also, SHCC compressive strength is mainly adversely affected by the water/binder ratio and the ratio of cement to fly ash. With the increase of compressive strength, the angle of the failure face was reduced under compression. The acoustic emission (AE) activity captured the initiation and development of cracks at the three stages in the notched specimens under tension. With the increase of the notch length, the fracture energy calculated by the tensile stress–crack mouth opening displacement (CMOD) curve decreases.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This research was partially funded by the National Natural Science Foundation of China (Projects 51978234 and 52179127), Key Research and Development Projects of Hebei Province (Project 19217617D), and the Natural Science Foundation of Hebei Province of China (Project E2020202015). This research was performed at the Hebei University of Technology. The support is gratefully acknowledged.
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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.
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Received: Sep 2, 2021
Accepted: May 4, 2022
Published online: Oct 27, 2022
Published in print: Jan 1, 2023
Discussion open until: Mar 27, 2023
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