Title:
Mechanical Properties and Microstructure of Carbon Fiber- Reinforced Nano-Metakaolin Recycled Concrete
Author(s):
J. Yan, Y. Luo, L. Feng, H. Zhang, W. Weng, B. Yang, J. Li, Y. Zhuang, J. Zuo, C. Liang, X. Wang, and J. Xie
Publication:
Materials Journal
Volume:
121
Issue:
6
Appears on pages(s):
41-54
Keywords:
carbon fiber (CF); interfacial transition zone (ITZ); mechanical properties; microstructure; nano-metakaolin (NMK); orthogonal test; recycled aggregate concrete (RAC)
DOI:
10.14359/51743286
Date:
12/1/2024
Abstract:
To make full use of recycled aggregate concrete (RAC), carbon
fiber (CF) and nano-metakaolin (NMK) were mixed into RAC to
improve its mechanical properties and microstructure. The effects
of NMK content, CF content, recycled aggregate (RA) replacement
rate, and CF length on the compressive strength, splitting tensile
strength, and tension-compression ratio of RAC were studied by the
orthogonal test method; then, the test results were analyzed. The
results show that the NMK content and RA replacement rate have
significant effects on the compressive strength of RAC, while the
CF content has significant effects on the splitting tensile strength
and the tension-compression ratio. Through the synergistic effect
of NMK and CF, the pore structure characteristics of RAC are
improved, and the bond strength of the interfacial transition zone
(ITZ) of CF-mortar is increased, which further enhances the
strengthening effect of CF; thus, the mechanical properties of RAC
are continuously enhanced.
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