Scopus İndeksli Yayınlar Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.14720/4

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Enhancement of Cement Mortar’s Resistance To Hydrochloric Acid Using Hybrid Sst/Dhst Fibers and Silica Fume
(Taylor and Francis Ltd., 2025) Akbulut, Z.F.
This study investigates the durability of cement mortars against hydrochloric (HCl) acid attacks by incorporating silica fume (SF), melt-extracted straight stainless steel (SST), and double-hooked steel (DHST) fibers. The addition of SF increased the mortar viscosity, reducing workability but significantly improving mechanical strength and resistance to HCl degradation. Combining SF with hybrid SST/DHST fibers showed promising results, demonstrating synergistic effects. SF’s pozzolanic activity promoted the formation of calcium-silicate-hydrate (C-S-H) bonds, filling pores, reducing permeability, and enhancing the mortar’s resistance to HCl exposure. Furthermore, hybrid SST/DHST fibers outperformed DHST fibers alone in mitigating micro and macro crack formation. Their combined ability to bridge and restrict crack propagation reinforced the mortar’s structural integrity. In conclusion, incorporating SF and hybrid fibers effectively improves mortar durability against HCl attacks. The findings highlight that the pozzolanic reaction of SF improves the durability of cement-based materials by enhancing the formation of C-S-H, which increases strength and reduces permeability. Additionally, the synergistic effect of hybrid fibers boosts crack resistance by distributing stress evenly and preventing crack propagation, offering valuable insights for optimizing cement mortar formulations in aggressive environments. © 2025 Informa UK Limited, trading as Taylor & Francis Group.
Experimental Investigation of the Surface Properties of Accidental Stained Carbonate Natural Stones
(Elsevier Ltd, 2022) Akbulut, Z.F.
Marmara White (MW), Bursa Beige (BB), Emprador (EM), and Kütahya Black (KB) natural stones are widely used as kitchen countertops and wet floor covering materials in our country. This study investigated the changes in these natural stones' gloss, roughness, and total color change properties due to the spillage of eight different food, beverage, and cleaning materials. Staining-cleaning cycles were applied to natural stones for 1, 3, and 7 days. In addition, with the help of field emission scanning electron microscopy (FESEM) analysis, the damage caused by these stain effects on the internal structures of these natural stones was investigated. According to the results obtained from the study, after three staining-cleaning cycles, the highest gloss loss was observed in the KB sample at the rate of 97.15 % after the descaler effect, while the minor gloss loss was obtained in the MW sample at the rate of 82.16 %. Furthermore, the highest roughness increase was observed in the KB sample at the rate of 555.1 % after the effect of descaler, while the slightest increase in roughness was obtained in the MW sample at the rate of 395 %. In addition, cooking oil has the most negative effect on natural stones' total color change (ΔE) properties. After three staining-cleaning cycles of the cooking oil effect, ΔE = 20.86 was obtained in the MW sample, while this value was 3.25 in the KB sample. © 2022 The Authors

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