Profile URL: https://hdl.handle.net/20.500.13091/11533
Job Title:Arş. Gör. Uzm.
Email Address:akaroglu@ktun.edu.tr
Main Affiliation:02.02. Department of Civil Engineering
Status: Current Staff
ORCID:
0000-0001-5882-4043
0000-0001-5882-4043Scopus ID:
60169981200
60169981200YÖK Akademik: 08878A23838BE0B7
Google Scholar:
https://scholar.google.com/scholar?hl=tr&as_sdt=0%2C5&q=ay%C5%9Fe+karo%C4%9Flu&oq=ay%C5%9Fe+kar
https://scholar.google.com/scholar?hl=tr&as_sdt=0%2C5&q=ay%C5%9Fe+karo%C4%9Flu&oq=ay%C5%9Fe+karName Variants:
Karoglu Turk, Ayse Turk, Ayse
4 results
Scholarly Output Search Results
Now showing 1 - 4 of 4
Article 3D Printable Mortars with Green Materials: Sustainable Solutions with Nanocellulose(Taylor & Francis Ltd, 2026) Turk, Ayse; Turk, Furkan; Edebali, Serpil; Keskin, Ulku SultanThis study aims to improve the fresh and hardened properties of 3D-printable mortars. For this purpose, mortar mixtures containing cellulose nanofibres (CNF) obtained from the green algae of the Cladophora sp., which is abundant in lakes and causes environmental pollution if not recycled, as well as commercially available cellulose nanocrystals (CNC) and welan gum (WG) were prepared. The results showed that CNF was the most effective additive in improving fresh-state rheology, increasing yield stress by approximately 6 times and thixotropy by 48 times compared to the reference sample. Additionally, the CNF-modified mortar could carry a load of 50 N in the fresh state. The CNC additive showed the best mechanical performance, increasing compressive strength by 12%. Cellulosic additives were also observed to reduce shrinkage. Nanocellulose additives also increased the interlayer adhesion strength. All additives used have improved the properties of 3D-printable mortars. This study successfully produced a 3D-printable concrete/mortar additive from Cladophora sp., an environmentally detrimental waste material.Master Thesis Selülozik Katkıların Sürdürülebilir 3d Beton Üretiminde Kullanımının İncelenmesi(Konya Teknik Üniversitesi, 2023) Karoğlu, Ayşe; Keski̇n, Ülkü Sultan3D beton baskı teknolojisi, inşaat sektörünün karşı karşıya kaldığı yüksek maliyetler, düşük iş gücü verimliliği, yüksek iş kazası oranları, işçilik kusurları, yüksek enerji tüketimi ve sera gazı emisyonları gibi sorunlara çözüm sunmaktadır. Bu tez çalışması ile, 3D baskı için kullanılacak harçların taze hal ve mekanik özelliklerinin iyileştirilmesi amaçlanmıştır. Bu amaç doğrultusunda tez çalışmasında, özellikle Türkiye'de bol bulunan, geri dönüşümü sağlanmadığı taktirde çevre kirliliğine ve canlı ölümlerine sebep olan Cladophora cinsi yeşil algden elde edilen selüloz nanolifler, ticari olarak temin edilen selüloz nanokristal ve halihazırda bir tür viskozite düzenleyici katkı olan welan sakızı içeren harç karışımları hazırlanmıştır. Hazırlanan harçlar üzerinde yayılma tablası, viskozimetre taze hal mukavemeti, basınç ve eğilme dayanımı deneyleri yapılmıştır. Çimento pastalarının viskozite, akma gerilmesi ve tiksotropi değerleri Bingham modeli kullanılarak elde edilmiştir. Elde edilen sonuçlara göre selüloz nanolif katkısı, referans numunesine kıyasla akma gerilmesini yaklaşık 6 kat ve tiksotropik özelliği yaklaşık 48 kat arttırmıştır. Taze hal dayanımı açısından en iyi sonucu selülozik nanolif katkısı göstermiştir ve 50 N yük taşıyabilmiştir. Eğilme ve basınç dayanımı açısından en iyi performansı selüloz nanokristal katkısı göstermiş ve eğilme dayanımını %6, basınç dayanımını %10 oranında arttırmıştır.Conference Object Investigation of Damaged or Destroyed Buildings in 6 February Earthquakes in Terms of Aggregate Particle Size and Shape(2023) Türk, Ayşe; Keskin, Ülkü Sultan; Türk, FurkanPurpose: As a result of two earthquakes with a magnitude of 7.8 Mw and 7.5 Mw, the epicenter of which was Kahramanmaraş on February 6, 2023, many buildings were severely damaged or collapsed. Considering the findings obtained from these buildings, it is aimed to emphasize the importance of maximum aggregate particle diameter and aggregate surface geometry in terms of concrete strength. Study design/methodology/approach: The city of Hatay, one of the provinces affected by the earthquake, was visited and images were obtained from the debris. The causes of aggregate-induced defects in the obtained images were examined in the light of the literature. Findings: Based on the available literature, it was concluded that coarse aggregate properties play a major role in stress transmission, crack growth rate and fracture mechanisms, strain against damage, tensile and compressive strength in concrete. Aggregate size and surface geometry are the parameters that determine the thickness and continuity of the interface transition zone (ITZ). ITZs around large aggregates accelerate crack development, while discontinuous ITZs around small aggregates do not affect crack development. Also, in case of larger aggregate particle size, the amount of unhydrated cement particles in the ITZ is lower and the amount of water in the aggregate surface area is greater, resulting in higher porosity and a lower quality ITZ. Aggregate surface geometry, which is another critical aggregate property, greatly affects the adherence between aggregate and cement matrix. Originality/value: In the buildings destroyed and damaged in the 6 February earthquakes, the aggregate shape and maximum particle size were not taken into account during the design phase, and it was revealed by the images obtained from the earthquake zone. The reasons for the errors caused by the aggregate defects are explained.Article Comparison of the Effect of Nano Cellulosic Additives on Rheological Parameters for 3d Printable Concretes(2023) Karoğlu, Ayşe; Türk, Furkan; Keskin, Ülkü Sultan; Celik, SenolIn 3D printable concretes, fresh requirements such as pumpability, workability, constructability are affected by the rheological properties of the mixture. High yield stress and high viscosity cause blockages in the transmission line, while low yield stress and low viscosity cause the mixture to not provide the required shape stability. Even if the mixture to be printed has suitable rheological parameters, it is very important in terms of workability that it can be preserved over time. Here, cellulose nanocrystals and cellulose nanofibers were used in cement paste mixtures in order to ensure sufficient workability time in 3D printable concrete mixtures, and also to ensure that the originally designed rheological properties can be maintained over time. The Bingham model, which was created as a result of the measurements made with the viscometer device, was used to evaluate the rheological parameters of the mixes containing cellulose nanocrystal and cellulose nanofiber additions in varied amounts. As a result of the study, it was determined that the yield stress of the reference sample increased by 290% 45 minutes after the preparation of the mixture, while this rate decreased to 135% in the use of cellulose nanocrystals and to 79% in the use of cellulose nanofibers. While it increased by 205% at the end, this rate decreased to 37% with cellulose nanofibers and to 68% with cellulose nanocrystals. When the different additives are compared, it was concluded that cellulose nanofiber may be more effective than cellulose nanocrystal in controlling the increase in viscosity and yield stress over time.
Research Topics
Domains
Health SciencesPhysical Sciences
Fields
DentistryEngineering
Subfields
OrthodonticsOral SurgeryAutomotive Engineering
Specific Research Areas
Dental materials and restorations
Dental Implant Techniques and Outcomes
Endodontics and Root Canal Treatments
Orthodontics and Dentofacial Orthopedics
Additive Manufacturing and 3D Printing Technologies
Sustainable Development Goals
13CLIMATE ACTION
1
Research Products
11SUSTAINABLE CITIES AND COMMUNITIES
1
Research Products
9INDUSTRY, INNOVATION AND INFRASTRUCTURE
1
Research Products
8DECENT WORK AND ECONOMIC GROWTH
1
Research Products
Documents
1
Citations
0
h-index
0
This researcher does not have a WoS ID.
Publication Collaboration
| Affiliation Name | Count |
|---|---|
| Ege University | 16 |
| Sivas Cumhuriyet Üniversitesi | 2 |
| Izmir Institute of Technology | 1 |
| Izmir University | 1 |
| Dokuz Eylül University | 1 |
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Data obtained from OpenAlex
| Journal | Count |
|---|---|
| European Journal of Environmental and Civil Engineering | 1 |
| Osmaniye Korkut Ata Üniversitesi Fen Bilimleri Enstitüsü Dergisi (Online) | 1 |
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Scholarly Output
4
Articles
2
Views / Downloads
18/38
Supervised MSc Theses
1
Supervised PhD Theses
0
WoS Citation Count
0
Scopus Citation Count
0
Patents
0
Projects
0
WoS Citations per Publication
0.00
Scopus Citations per Publication
0.00
Open Access Source
3
Supervised Theses
1
Scopus Quartile Distribution
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