期刊
NANOMATERIALS
卷 12, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/nano12060943
关键词
geopolymer; graphene oxide; single fiber pullout; bond-slip; rate sensitive
类别
资金
- National Research Council of Thailand (NRCT)
- National Science, Research and Innovation Fund (NSRF)
- King Mongkut's University of Technology North Bangkok (KMUTNB) [KMUTNB-FF-66-02, KMUTNB-PHD-62-06]
- Thailand Research Fund [RTA6280012]
This study investigated the influence of graphene oxide nanoparticles on the bond-slip behavior of fiber and fly-ash-based geopolymer paste. The results showed that the addition of graphene oxide increased the compressive strength of the geopolymer and improved the bond-slip responses of fibers embedded in the geopolymer mixed with graphene oxide. Different types of fibers also exhibited different failure modes.
In this study, the influence of graphene oxide nanoparticles on the bond-slip behavior of fiber and fly-ash-based geopolymer paste was examined. Geopolymer paste incorporating a graphene oxide nanoparticle solution was cast in half briquetted specimens and embedded with a fiber. Three types of fiber were used: steel, polypropylene, and basalt. The pullout test was performed at two distinct speeds: 1 mm/s and 3 mm/s. The results showed that the addition of graphene oxide increased the compressive strength of the geopolymer by about 7%. The bond-slip responses of fibers embedded in the geopolymer mixed with graphene oxide exhibited higher peak stress and toughness compared to those embedded in a normal geopolymer. Each fiber type also showed a different mode of failure. Both steel and polypropylene fibers showed full bond-slip responses due to their high ductility. Basalt fiber, on the other hand, because of its brittleness, failed by fiber fracture mode and showed no slip in pullout responses. Both bond strength and toughness were found to be rate-sensitive. The sensitivity was higher in the graphene oxide/geopolymer than in the conventional geopolymer.
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