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Öğe Synergistic effects of Bacillus subtilis and PET fiber additions on the mechanical properties of Alkali-Activated composite mortars(Elsevier, 2024) Filazi, AhmetThis study investigates the impact of Bacillus subtilis and PET fiber additions on the mechanical properties of alkali-activated composite mortars (AACMs). Blast furnace slag (BFS) is used as the primary binder, activated by sodium hydroxide (NaOH) and sodium silicate (Na2SiO3). Controlled curing conditions at 20( degrees )C and 100 % relative humidity for 28 days were maintained. Comprehensive tests, including compressive strength, flexural strength, and scanning electron microscopy (SEM) analyses, were conducted. Results showed that AACMs incorporating Bacillus subtilis exhibited a 25 % increase in compressive strength and a 20 % increase in flexural strength compared to control samples. The addition of PET fibers further improved these properties by 10 % and 8 %, respectively. These findings highlight the potential of bio-enhanced alkali-activated materials in sustainable construction.Öğe The Effects of Silicon Carbide Usage on Strength, Electrical Conductivity, and Durability in Cement Composites(Springer Science and Business Media B.V., 2024) Filazi, Ahmet; Şenses, Ahmet Mustafa; Aydin, TunaThis study investigates the effect of silicon carbide (SiC) powder on cement pastes. SiC was added in various percentages by weight of cement (1%, 2%, 4%, 8%, 12%, and 16%). The spread diameter, mechanical strength, chloride permeability, capillary water absorption, and electrical conductivity of each mixture were determined, and microstructural analyses (SEM and EDX) were conducted. The results indicate that SiC decreases the spread diameter of the mortar while increasing its mechanical strength and electrical conductivity. Specifically, 2% and 4% SiC additions resulted in the highest strength improvements. Chloride permeability tests showed that the resistance of concrete to chloride ions improved over time, with permeability levels significantly decreasing. Microstructural analyses revealed that SiC influences the formation of C-S–H and C-H structures in the cement matrix, enhancing mechanical strength and overall durability. This study highlights the potential of SiC to improve the mechanical properties and electrical conductivity of cement in the industry, suggesting avenues for future research to explore different SiC concentrations and application methods in greater detail. © The Author(s), under exclusive licence to Springer Nature B.V. 2024.Öğe The Effects of Calcite-Producing Bacteria on the Engineering Properties of Alkali-Activated Composite Mortars(Springer Science and Business Media Deutschland GmbH, 2024) Filazi, AhmetThis study aims to explore the impact of calcium carbonate-producing bacteria on the engineering properties of alkali-activated composite mortars (AACMs). This study conducted an investigation on the mechanical properties, water absorption, rapid chloride ion permeability, ultrasonic pulse velocity, and mercury porosimetry of AACMs with varying cell concentrations of microbial Bacillus subtilis (BS) per milliliter (103, 105, and 107 cells/ml). Regarding the beneficial effects of improvement agents on concrete behavior, the effect of microbial-induced carbonate precipitation (MICP) in AACMs, which is an environmentally friendly solution for engineering properties, was investigated. AACMs with three different cell concentrations of Bacillus subtilis (103, 105, and 107 cells/ml) were investigated. Among these, the sample featuring 105 cells/ml exhibited the most favorable flexural and compressive strength. 7 and 28 days flexural strengths of 105 cells/ml added AACMs samples were 8.16 and 23.80%, while their compressive strengths were 17.70 and 22.65%, respectively. A decrease of approximately 12.27% was observed in water absorption in 28-day AACMs samples, and a decrease of 24.70% was observed in rapid chloride ion permeability. It was seen in the study that BS bacteria species caused a noticeable improvement in the performance of AACMs. © The Author(s), under exclusive licence to Shiraz University 2024.
