Browsing by Author "Karapinar, Isil Sanri"

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Citation - WoS: 5
Citation - Scopus: 5
Improvement of mechanical strength of mortars by different morphological zinc oxide nanoparticles
(ICE Publishing, 2022) Yazgan, Ahmet Utku; Karakus, Selcan; Pehlivan, Ahmet Onur; Karapinar, Isil Sanri; Ozbay, Ayse Elif Ozsoy; Tasaltin, Nevin; Kilislioglu, Ayben
This study presents novel nano-mixtures containing zinc oxide (ZnO) nanoparticles (NPs) to enhance the mechanical properties of cement mortars. Different morphological ZnO NPs were synthesised through the green sonochemical method, using tragacanth gum/Kappa carrageenan (TG/kappa-C) and tragacanth gum/chitosan (TG/CS) as biopolymer matrices. The ZnO NPs were characterised using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy, X-ray diffraction, Zetasizer and Brunauer-Emmett-Teller techniques. The intrinsic viscosities of TG/kappa-C-ZnO and TG/CS-ZnO NPs were investigated to determine the miscibility of the polymeric blends in aqueous solution as affected by sonication time and composition ratios. The average diameters for the spherical and prism-like ZnO NPs were around 266 nm and 355 nm, respectively. Seven different cement mortar specimens containing TG/kappa-C-ZnO and TG/CS-ZnO NPs were prepared in ratios of 0, 0.1, 0.5 and 1% by weight, and the flexural and compressive strengths of the specimens were determined at the ages of 7 and 28 days. The results indicate that there is a significant improvement in the mechanical performance of different morphological ZnO NP-based cement mortar composites. In comparison, it was observed that specimens containing TG/kappa-C-ZnO NPs had much better results than TG/CS-ZnO NPs. Moreover, the workability problem encountered by using only ZnO NPs has been overcome with the presented biopolymers used in this study.
Investigation of the Mechanical Strength of Cement Mortars Containing Novel Synthesised Chitosan/Hydromagnesite Stromatolite Nano-Composite
(Croatian Soc Civil Engineers-Hsgi, 2025) Karakus, Selcan; Ozbay, Ayse Elif Ozsoy; Pehlivan, Ahmet Onur; Yazgan, Ahmet Utku; Karapinar, Isil Sanri; Tasaltin, Nevin; Kilislioglu, Ayben
This study introduces the use of a novel synthesised chitosan/hydromagnesite stromatolite (CHT/HS) nano-composite in cement mortars and investigates its effects on the mechanical properties. The proposed bio-based nano-composite was synthesised by a green sonication method using HS originating from Salda Lake (Burdur, Turkey). The chemical and morphological properties of HS and CHT/HS nano-composites were determined. Specimens including HS in ratios of 5 and 10 % and CHT/HS nanostructures with 0.1, 0.5, 1 and 2 % were tested for flexural and compressive strengths for 7 and 28 days. The novel synthesised CHT/HS nano-composite showed a clear enhancement in mechanical strength. These findings suggest directions for future work on different nano-filler applications.
Citation - WoS: 1
Citation - Scopus: 1
Mechanical Properties of Cement Mortars Incorporating Zero-Valent Iron Nanoparticles
(Asce-Amer Soc Civil Engineers, 2022) Ozbay, Ayse Elif Ozsoy; Karapinar, Isil Sanri; Yazgan, Ahmet Utku; Pehlivan, Ahmet Onur; Karakus, Selcan; Tasaltin, Nevin; Kilislioglu, Ayben
In this study, the effects of zero-valent iron (ZVI) nanoparticles (NPs) on the mechanical performance of cementitious composites were investigated. For this purpose, the use of a novel nanomaterial containing ZVI NPs blended with carboxymethyl cellulose (CMC) and SiO2 was introduced. CMC/SiO2-ZVI NPs were prepared by a green and low-cost sonochemical method at room temperature and characterized using scanning electron microscopy/energy dispersive X-ray spectroscopy, thermal gravimetry analysis, Brunauer-Emmett-Teller, and X-ray diffraction techniques. The values of intrinsic viscosities of CMC/SiO2-ZVI NPs were examined to determine the optimal miscible condition as affected by the different mass ratios of CMC/SiO2 and sonication time. Then, eight different cement mortar specimens containing CMC/SiO2 and CMC/SiO2-ZVI NPs were prepared in ratios of 0.2%, 0.5%, 1%, and 2% by weight, and flexural and compressive strengths of the specimens were determined at the ages of 7 and 28 days. The microstructure of the specimens was also evaluated. Comprehensive results proving the improvement in the mechanical properties have been obtained in the specimens containing 1% and 2% CMC/SiO2-ZVI NPs. (C) 2021 American Society of Civil Engineers.