Farklı Su/Çimento Oranlarına Sahip Kalsiyum Alüminat Çimentolu Betonların Yüksek Sıcaklıkta Basınç Dayanımlarının ve Elastisite Modüllerinin İncelenmesi
Abstract
Son yıllarda yüksek performanslı beton tasarımında bağlayıcı olarak kalsiyum alüminat çimentosu kullanılabilmektedir. Kalsiyum alüminat çimentosu yüksek sıcaklıklara ve asidik ortamlara karşı üstün performans gösteren bir çimento türüdür. Aynı zamanda çok hızlı sertleşme kabiliyeti sayesinde tamir harcı olarak da kullanılabilmektedir. Ancak Portland çimentosunun aksine hidratasyon mekanizması sıcaklık ve nemden büyük ölçüde etkilenir. Hidratasyon ürünleri belli dönüşümlere uğramak suretiyle kararlı hale geçme eğilimindedirler. Bu dönüşümler kalsiyum alüminat çimentolu betonun mekanik özelliklerini negatif anlamda etkiler. Bu nedenle kalsiyum alüminat çimentosunun hidratasyon mekanizmasına etki eden faktörlerin araştırılması gerekir. Özellikle kalsiyum alüminat çimentolu betonda optimum su/çimento oranın tespiti bu açıdan oldukça önemlidir. Bu çalışmada farklı su/çimento oranlarına sahip (0.35, 0.40, 0.45) kalsiyum alüminat çimentolu betonların normal sıcaklıkta ve yüksek sıcaklıkta (600 ºC) basınç dayanımları ve elastisite modülleri araştırılmıştır. Çalışma sonucunda yüksek sıcaklık altında kalsiyum alüminat çimentolu betonda su/çimento oranı arttıkça basınç dayanımı ve elastisite modülü değerlerindeki azalma oranının arttığı tespit edilmiştir. İşlenebilirlik ve dayanım parametreleri birlikte değerlendirildiğinde kalsiyum alüminat çimentolu betonun tasarımında 0,35-0,40 aralığındaki su/çimento oranının makul bir değer olabileceği değerlendirilmiştir.
Supporting Institution
Kahramanmaraş Sütçü İmam Üniversitesi Bilimsel Araştırmalar Koordinasyon Birimi
Project Number
2021/2-31 M
Thanks
Kahramanmaraş Sütçü İmam Üniversitesi Bilimsel Araştırmalar Koordinasyon Birimine desteklerinden dolayı teşekkür ederiz.
References
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- Chen X., Wu S., Zhou J. Influence of porosity on compressive and tensile strength of cement mortar. Construction and Building Materials 2013; 40: 869-874.
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Investigation of Compressive Strength and Modulus of Elasticity of Calcium Aluminate Cement Concretes with Different Water/Cement Ratios at High Temperature
Abstract
In recent years, calcium aluminate cement can be used as a binder in high performance concrete design. Calcium aluminate cement is a cement type with superior performance against high temperatures and acidic environments. It can also be used as a repair mortar due to its fast hardening ability. However, unlike Portland cement, the hydration mechanism is greatly affected by temperature and humidity. Hydration products tend to become stable by undergoing some transformations. These transformations negatively affect the mechanical properties of calcium aluminate cement concrete. Therefore, the factors affecting the hydration mechanism of calcium aluminate cement should be investigated. In this respect, it is very important to determine the optimum water/cement ratio in concrete with calcium aluminate cement. In the present study, compressive strength and modulus of elasticity of calcium aluminate cement concretes with different water/cement ratios (0,35, 0,40, 0,45) at normal and high temperatures (600 ºC) were investigated. As a result of the study, it was determined that the loss of compressive strength and modulus of elasticity under high temperature increased as the water/cement ratio increased in the calcium aluminate cemented concrete. In terms of workability and strength parameters, the water/cement ratio in the range of 0,35-0,40 is a reasonable value in the design of calcium aluminate cement concrete.
Project Number
2021/2-31 M
References
- Abolhasani A., Nazarpour H., Dehestani M. The fracture behavior and microstructure of calcium aluminate cement concrete with various water-cement ratios. Theoretical and Applied Fracture Mechanics 2020; 109: 102690.
- Antonovič V., Kerienė J., Boris R., Aleknevičius M. The effect of temperature on the formation of the hydrated calcium aluminate cement structure. Procedia Engineering 2013; 57: 99-106.
- Apebo NS., Shiwua AJ., Agbo AP., Ezeokonkwo JC., Adeke PT. Effect of water-cement ratio on the compressive strength of gravel-crushed over burnt bricks concrete. Civil and Environmental Research 2013; 3(4): 74-81.
- Arioz O. Effects of elevated temperatures on properties of concrete. Fire Safety Journal 2007; 42(8): 516-522.
- Arslan EI., Aslan S., Ipek U., Altun S., Yazicioğlu S. Physico-chemical treatment of marble processing wastewater and the recycling of its sludge. Waste Management and Research 2005; 23(6): 550-559.
- ASTM C469/C469M Standard test method for static modulus of elasticity and poisson’s ration of concrete in compression. ASTM International West Conshohocken, 2014.
- Baradaran-Nasiri A., Nematzadeh M. The effect of elevated temperatures on the mechanical properties of concrete with fine recycled refractory brick aggregate and aluminate cement. Construction and Building Materials 2017; 147: 865-875.
- Chen X., Wu S., Zhou J. Influence of porosity on compressive and tensile strength of cement mortar. Construction and Building Materials 2013; 40: 869-874.
- Felekoğlu B., Türkel S., Baradan B. Effect of water/cement ratio on the fresh and hardened properties of self-compacting concrete. Building and Environment 2007; 42(4): 1795-1802.
- Ideker JH., Gosselin C., Barborak R. An alternative repair material. Concrete International 2013; 35(4): 33-37.
- Khaliq W., Khan HA. High temperature material properties of calcium aluminate cement concrete. Construction and Building Materials 2015; 94: 475-487.
- Khan M., Lao J., Ahmad MR., Kai MF., Dai JG. The role of calcium aluminate cement in developing an efficient ultra-high performance concrete resistant to explosive spalling under high temperatures. Construction and Building Materials 2023; 384: 131469.
- Panda S., Sarkar P., Davis R. Effect of water-cement ratio on mix design and mechanical strength of copper slag aggregate concrete. IOP Conference Series: Materials Science and Engineering 2020; 936: 012019.
- Popovics S., Ujhelyi J. Contribution to the concrete strength versus water-cement ratio relationship. Journal of Materials in Civil Engineering 2008; 20(7): 459-463.
Details
| Primary Language | Turkish |
|---|---|
| Subjects | Civil Engineering |
| Journal Section | RESEARCH ARTICLES |
| Authors | |
| Project Number | 2021/2-31 M |
| Publication Date | January 22, 2024 |
| Submission Date | March 29, 2023 |
| Acceptance Date | July 20, 2023 |
| Published in Issue | Year 2024 Volume: 7 Issue: 1 |
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