Intarabut Darrakorn, Sukontasukkul Piti, Phoo-Ngernkham Tanakorn, Zhang Hexin, Yoo Doo-Yeol, Limkatanyu Suchart, Chindaprasirt Prinya
Construction and Building Materials Research Center, Department of Civil Engineering, Faculty of Engineering, King Mongkut's University of Technology North Bangkok, Bangkok 10800, Thailand.
Sustainable Construction Material Technology Research Unit, Department of Civil Engineering, Faculty of Engineering and Architecture, Rajamangala University of Technology Isan, Nakhon Ratchasima 30000, Thailand.
Nanomaterials (Basel). 2022 Mar 13;12(6):943. doi: 10.3390/nano12060943.
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.
在本研究中，考察了氧化石墨烯纳米颗粒对纤维和粉煤灰基地质聚合物浆体粘结滑移行为的影响。将掺入氧化石墨烯纳米颗粒溶液的地质聚合物浆体浇筑成半块试件，并埋入一根纤维。使用了三种类型的纤维：钢纤维、聚丙烯纤维和玄武岩纤维。拔出试验以两种不同速度进行：1毫米/秒和3毫米/秒。结果表明，添加氧化石墨烯使地质聚合物的抗压强度提高了约7%。与嵌入普通地质聚合物中的纤维相比，嵌入掺有氧化石墨烯的地质聚合物中的纤维的粘结滑移响应表现出更高的峰值应力和韧性。每种纤维类型也表现出不同的破坏模式。钢纤维和聚丙烯纤维由于其高延展性而表现出完全的粘结滑移响应。另一方面，玄武岩纤维由于其脆性，以纤维断裂模式破坏，在拔出响应中未出现滑移。粘结强度和韧性均被发现对速率敏感。氧化石墨烯/地质聚合物中的敏感性高于传统地质聚合物。
