Yazar "Demircan, Ruya Kilic" seçeneğine göre listele

Listeleniyor 1 - 7 / 7
  • [ X ]
    Öğe
    Eco-efficient lime/pumice mortars with sheep wool for heritage restoration: Life cycle and energy savings
    (Pergamon-Elsevier Science Ltd, 2025) Demircan, Ruya Kilic; Isik, Muhammet Ahmet Mecit; Benli, Ahmet; Genc, Gokhan; Beyhan, Figen; Kaplan, Gokhan
    Currently, 40 % of CO2 emissions and energy use are attributable to the building sector. Aside from thermal insulation levels and energy requirements, primary energy consumption, CO2 reductions, and the environmentally friendly properties of the materials used are currently being considered when evaluating building sustainability and energy efficiency. Therefore, it is essential to optimize the use of ecological materials in buildings in order to make them as sustainable as feasible. Utilizing slaked lime and pumice powder as binders, nine distinct types of mortars reinforced with sheep wool fibers with comparable workability were examined. This research assessed the fresh, physico-mechanical, durability, life cycle assessment and thermal properties of restoration mortars reinforced with wool fibers and containing pumice powder in place of slaked lime at 0, 25, and 50 % replacement rates. The three percentages of wool fibers by volume that were used in this investigation were 0, 0.25 and 0.50 %. It was also investigated how well the combinations held up to high temperatures, dry shrinkage, and sorptivity. Microstructural analysis of the mixtures were made based on SEM. The findings indicated that the mixture with 50 % pumice powder and 0 %wool fibers showed the best compressive strength performance, exhibiting a strength gain of approximately 953 and 643 % in comparison to the control mixture at 28 and 90 days, respectively. The same mixture also demonstrated the lowest sorptivity and dry shrinkage, while the reference blend exhibited the lowest thermal conductivity. The mixture with 50 %PP and 0.50 %wool fibers showed the best high temperature performance.
  • [ X ]
    Öğe
    Eco-efficient lime/pumice mortars with sheep wool for heritage restoration: Life cycle and energy savings (vol 215, 115624, 2025)
    (Pergamon-Elsevier Science Ltd, 2026) Demircan, Ruya Kilic; Isik, Muhammet Ahmet Mecit; Benli, Ahmet; Genc, Gokhan; Beyhan, Figen; Kaplan, Gokhan
    [No abstract available]
  • [ X ]
    Öğe
    Evaluation of the Structural Balance of Large Scale Historical Castle and City Walls Under Environmental Effects By Analytical Methods
    (Gazi Univ, 2022) Demircan, Ruya Kilic; Unay, Ali Ihsan
    Some of the historical buildings that bear witnesses of civilizations and repercussion of cultures have defeated by all the negative effects of time and this time period but some of them still shed light on the present day.Examples of castle-type historical structures that challenge centuries were generally built in different forms and purposes than other types of structures. It is known that they are heavier and more durable than other structures for their construction purposes. Historical structures such as mosques, churches and bridges, expressed in a form, have structural elements such as columns, beams, vaults, domes, arches. Generally, it is easier to comment on the structural behavior of these types of structures with structural behavior theories. However, when interpreting about the structural behaviors of buildings with heavy mass, such as castle, not having a specific, regular form, it is necessary to proceed systematically in line with the basic principles of engineering. The purpose of this article is the systematic interpretation of the structural balance of the castle-type heavy mass structures under environmental effects by finite element calculation method. Three basic form in finite element modeling, rectangular, hexagonal and circular geometry samples of tower, are modeled in SAP 2000 finite element package program. The effect of time-dependent material loss of these three forms on the structure was analyzed by gradual linear static analysis.
  • [ X ]
    Öğe
    High temperature resistant restoration mortar with fly ash and GGBFS
    (Taylor & Francis Ltd, 2022) Demircan, Ruya Kilic; Kaplan, Gokhan; Celik, Damla Nur
    Nowadays, the development of sustainable building materials is of loom large in for the preserve resources and reducing CO2 emission and environmental pollution effects. Exposure to fire or other high temperatures of mortars produced with calcium-based binders (cement or hydraulic lime) adversely affects their mechanical properties. In addition, the effect of high temperature may cause a change in the pore structures, causing cracking and spalling. Protecting the integrity of historical buildings exposed to high temperatures is important for cultural sustainability. In this study, natural hydraulic lime (NHL) used as a binder in mortars was replaced with 15, 30 and 60% fly ash (FA) and granulated blast furnace slag (GBFS). In the mixtures, 1.5% (by volume) polypropylene fiber (PF) was also used. Test results reveal that while the mortars' workability increased as the FA and GBFS content increased, PF decreased the flow diameters of the mortars. It has been determined that the paste content affects the porosity and water absorption rates of mortars. With the addition of FA content, paste content increased and porosity reduced. Compressive strength over 10 MPa was obtained by using 30% FA in 90-day lime mortars. As the addition of GBFS, the compressive and flexural strength were negatively affected. PF has reduced the porosity and water penetration depth of the mortars thanks to its micro filler effect. FA-based mixtures were more resistant to high temperatures than GBFS-based mixtures. Compressive strength was measured between 4.3 and 8.6 MPa after 600 degrees C temperature in FA-based mixtures. In fibrous mixtures, increment of mass loss was more with high temperature. C-S-H gels were observed in XRD and SEM analyzes of mortars exposed to high temperatures. PF was observed in stereomicroscope images of mixtures exposed to 200 degrees C. Since the porosity of the mortars is relatively high (19.7%-30.8%), the PF in the mixtures exposed to 200 degrees C did not melt completely but was damaged. As a result, it would be more appropriate to use 30% of FA and 15% of GBFS in NHL mortars.
  • [ X ]
    Öğe
    Innovative solutions on ductility and bearing capacity: Strengthening flexural performance of reinforced concrete beams with recycled face mask fibers
    (Elsevier Sci Ltd, 2025) Ozdemir, Anil; Bozyigit, Baran; Demircan, Ruya Kilic; Mercimek, Omer; Celik, Damla Nur; Akkaya, Sercan Tuna; Kaplan, Gokhan
    This study investigates the effects of fibers derived from disposable face masks on the flexural performance of reinforced concrete (RC) beams during the COVID-19 pandemic. Mask fibers were compared with commonly used synthetic fibers such as glass, basalt and polypropylene to evaluate structural elements' bearing capacity, ductility and energy absorption capacities. In the experimental study, five different BA beams were investigated by applying a four-point bending test, and the experimental test results were verified using finite element analysis (FEA) with ABAQUS software. The test results show that the fibers obtained from the mask increase the bearing capacity by 6 %, improve the ductile behavior of the beams, and increase the energy absorption capacity up to 80 % after the load-carrying capacity reaches its maximum. An increase of up to 40 % in energy absorption capacity was observed. This demonstrates that mask fibers enable reinforced concrete beams to absorb more energy under deformation. It was also found that the fibers obtained from the mask exhibited similar performance with polypropylene fibers. Still, the effect of glass and basalt fibers on the bearing capacity was higher. The study results show that mask waste can be used in reinforced concrete elements as a sustainable and innovative building material. Both experimental and finite element results prove that mask fibers improve the flexural performance of reinforced concrete beams and contribute to environmental sustainability. Reusing mask waste in the construction industry has significant environmental and economic potential.
  • [ X ]
    Öğe
    Simplified FE-Based Post-Earthquake Vulnerability Assessment of a Partially Collapsed Historic Mosque
    (Mdpi, 2025) Demircan, Ruya Kilic
    On 6 February 2023, two major earthquakes struck southeastern T & uuml;rkiye along the East Anatolian Fault, causing widespread structural damage, including the partial collapse of the historic Habibi Neccar Mosque in Antakya. This study presents a simulation-based approach to rapidly assess the seismic vulnerability of this partially damaged historic masonry structure. Due to the complexity and urgent condition of such heritage buildings, a simplified finite element (FE) modeling methodology is employed to evaluate structural behavior and support immediate stabilization decisions. Response spectrum analysis is applied to simulate and interpret stress distribution and deformation patterns in both undamaged and damaged states. The simulation results highlight significant tensile stress concentrations exceeding 0.2 MPa at dome-arch joints and vaults-primary indicators of localized failures. Additionally, the analysis reveals increased out-of-plane deformations and the influence of soil amplification in the remaining walls, both of which further compromise the structural integrity of the building. The findings demonstrate that simplified FE simulations can serve as practical and efficient tools for early seismic assessment of historic structures, contributing to rapid decision making, risk mitigation, and cultural heritage preservation in earthquake-prone areas.
  • [ X ]
    Öğe
    The effect of animal and synthetic fibers on the physico-mechanical durability and microstructure properties of natural hydraulic lime-based mortars
    (Elsevier, 2023) Demircan, Ruya Kilic; Tayeh, Bassam A.; Celik, Damla Nur; Kaplan, Gokhan; Tobbala, Dina E.
    This paper aims to study the effect of adding horsehair (HH), polypropylene (PF), carbon (CF), basalt (BF) and glass fibers (GF) on the physico-mechanical durability and microstructure properties of natural hydraulic lime-based mortars (NHL). The studied fibers were added to the mixture at 0.3 %, 0.6 %, and 1.2 % by weight of NHL and compared with plain NHL mortar. The workability (flow diameter test), physical (dry bulk density and water absorption), compressive strength (f(c)) and flexural strength (f(f)) (at 7 and 28 days) were tested. The durability was tested by water penetration depth (Wd), NaCl and Na2SO4 salt crystallization and exposure to the wetting-drying (W-D) cycles in Na2SO4, as proved by XRD. Scanning electron microscopy (SEM) of samples after 28 days of curing. From the results, it can be concluded that HH3 (0.3 % fiber) has the highest dry density (1794 kg/m(3)), fc and f(f) at 28-days (13.3 and 4.2 MPa), and resistance of all salt crystallization tested, smallest water absorption percentage (16.2 %), and water penetration depth (38.23 mm) of all mortars. On the other hand, it can be noted that adding synthetic types of fibers reduced the dry density and increased water absorption. The XRD explained that immersion or exposure to (W-D) cycles of Na2SO4 has a worse effect on hydration than NaCl exposure. The SEM shows that fiber-filled lime mortar's mechanical properties and durability are improved through the conductive network, especially HH, which had a large diameter with a rough surface and indicated a sufficient level of adhesion with the matrix.