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Reolojik Parametreleri Ölçülebilen Farklı C3A Oranına Sahip Hamur Karışımlarında Optimum Su Azaltıcı Katkı Dozajının ve Su Muhtevasının Belirlenmesi

Year 2022, Issue: 37, 17 - 20, 15.07.2022
https://doi.org/10.31590/ejosat.1125646

Abstract

C3A oranı, çimentolu sistemlerin reolojik özelliklerini büyük oranda etkileyen parametrelerden birisidir. C3A oranındaki artışla birlikte hedef yayılmayı sağlamak için su azaltıcı katkı ve/veya su ihtiyacı artmaktadır. Hamur karışımlarının reolojik parametrelerinin ölçümü için üretilen karışımların su/çimento (s/ç) oranı ve su azaltıcı katkı gereksiniminin belirlenmesinde; kullanılan reometrenin tipi, uygulanan yöntem, karışımın homojen hazırlanması ve su azaltıcı katkı içeriği gibi parametreler dikkate alınmaktadır. Üretilen karışımın aşırı katı (reometrenin ölçüm kapasitesini aşabilir/karışım homojen olmayabilir) ve aşırı akışkan (ayrışma riski olabilir) olmaması gerekmektedir. Bu sebeple, reolojik ölçüm alınabilen karışımlarda, optimum su azaltıcı katkı gereksinimi ve s/ç oranının belirlenmesi büyük önem taşımaktadır. Bu çalışmada, farklı C3A oranına sahip hamur karışımlarında reolojik ölçüm alınabilen ve segregasyona yol açmayan optimum polikarboksilat esaslı su azaltıcı katkı (PCE) dozajı ve s/ç oranı araştırılmıştır. Bu amaçla, %2, %3, %6, %9 olmak üzere 4 farklı oranda C3A oranına sahip CEMI 42.5R tipi portland çimentosu kullanılmıştır. 5 farklı dozajda PCE (çimento ağırlığının %0, 0.05, 0.10, 0.15 ve 0.20’si) ilave ederek 4 farklı s/ç oranına (0.30, 0.32, 0.35 ve 0.40) sahip toplam 80 farklı hamur karışımı hazırlanmıştır. Elde edilen sonuçlara göre, karışımların C3A oranındaki artışla birlikte katkı ihtiyacının ve s/ç oranının arttığı gözlemlenmiştir. Öte yandan, düşük C3A oranına sahip karışımlarda, PCE dozajının ve s/ç oranının artmasıyla segregasyon eğiliminin arttığı tespit edilmiştir. Sonuç olarak, hamur karışımlarında reolojik parametreler bakımından optimum PCE dozajı %0, %0.10 ve %0.15 olarak tespit edilmiştir. Ayrıca, optimum s/ç oranı 0.32 ve 0.35 aralığında elde edilmiştir

Supporting Institution

TUBİTAK

Project Number

219M425

Thanks

Yazarlar, Türkiye Bilimsel ve Teknolojik Araştırma Kurumu'na (TÜBİTAK) katkılarından dolayı teşekkür etmektedir (Proje No: 219M425).

References

  • Alonso, M. M., & Puertas, F. (2015). Adsorption of PCE and PNS superplasticisers on cubic and orthorhombic C3A. Effect of sulfate. Construction and Building Materials, 78, 324-332.
  • Altun, M. G., Özen, S., & Mardani-Aghabaglou, A. (2021). Effect of Side Chain Length Change of Polycarboxylate-Ether–Based High-Range Water–Reducing Admixture on Properties of Cementitious Systems Containing Fly Ash. Journal of Materials in Civil Engineering, 33(4), 04021015.
  • Han, S., Yan, P., & Kong, X. (2011). Study on the compatibility of cement-superplasticizer system based on the amount of free solution. Science China Technological Sciences, 54(1), 183-189.
  • Karakuzu, K., Kobya, V., Mardani-Aghabaglou, A., Felekoğlu, B., & Ramyar, K. (2021). Adsorption properties of polycarboxylate ether-based high range water reducing admixture on cementitious systems: A review. Construction and Building Materials, 312, 125366.
  • Liu, M., Gao, Y., Zhang, L., Jiang, G., Zeng, C., & Wang, P. (2021). The application of thermal analysis to study the hydration behavior of tricalcium aluminate-gypsum in the presence of polycarboxylate-based superplasticizers. Thermochimica Acta, 696, 178821.
  • Mardani-Aghabaglou, A. (2016). Investigation of cement-superplasticizer admixture compatibility (Doctoral dissertation, PhD Thesis. Turkey, Izmir, Ege University, Engineering Faculty, Civil Engineering Department).
  • Özen, S., Altun, M. G., Mardani‐Aghabaglou, A., & Ramyar, K. (2021). Effect of main and side chain length change of polycarboxylate‐ether‐based water‐reducing admixtures on the fresh state and mechanical properties of cementitious systems. Structural Concrete, 22, E607-E618.
  • Zingg, A., Winnefeld, F., Holzer, L., Pakusch, J., Becker, S., Figi, R., & Gauckler, L. (2009). Interaction of polycarboxylate-based superplasticizers with cements containing different C3A amounts. Cement and Concrete Composites, 31(3), 153-162.

Determination of Optimum Water Reducing Admixture Dosage and Water Content in the Measurement of Rheological Parameters of Paste Mixtures Having Different C3A Ratios

Year 2022, Issue: 37, 17 - 20, 15.07.2022
https://doi.org/10.31590/ejosat.1125646

Abstract

C3A ratio is one of the parameters that greatly affects the rheological properties of cementitious systems. With the increase in the C3A ratio, the water reducing admixtures and/or water requirement increases to achieve the target spread. Some parameters are taken into account such as the type of rheometer, application of the method, the homogeneous preparation of the mixture and the water reducing admixture content in determining the water/cement (w/c) ratio and water reducing admixture requirement in the mixtures produced for the measurement of the rheological parameters of paste mixtures. The mixture produced should not be too solid (it may exceed the measuring capacity of the rheometer / the mixture may not be homogeneous) and excessively fluid (there may be a risk of segregation). For this reason, it is of great importance to determine the optimum water reducing admixture requirement and water/cement (w/c) ratio in mixtures where rheological measurements can be taken. In this study, optimum polycarboxylate-based water reducing admixture (PCE) dosage and w/c ratio were investigated in paste mixtures having different C3A ratios. For this purpose, CEMI 42.5R type portland cement with 4 different C3A ratios as 2%, 3%, 6% and 9% was used. A total of 80 different paste mixtures with 4 different w/c ratios (0.30, 0.32, 0.35 and 0.40) were prepared by adding PCE (0, 0.05, 0.10, 0.15 and 0.20% by weight of cement) in 5 different dosages. According to the results, it was observed that the admixture requirement and w/c ratio increased with the increase in the C3A ratio of the mixtures. On the other hand, it was determined that the segregation tendency increased with the increase of PCE dosage and w/c ratio in mixtures with low C3A ratio. As a result, the optimum PCE dosage was determined as 0%, 0.10% and 0.15% in terms of rheological parameters in paste mixtures. Also, the optimum w/c ratio was obtained between 0.32 and 0.35.

Project Number

219M425

References

  • Alonso, M. M., & Puertas, F. (2015). Adsorption of PCE and PNS superplasticisers on cubic and orthorhombic C3A. Effect of sulfate. Construction and Building Materials, 78, 324-332.
  • Altun, M. G., Özen, S., & Mardani-Aghabaglou, A. (2021). Effect of Side Chain Length Change of Polycarboxylate-Ether–Based High-Range Water–Reducing Admixture on Properties of Cementitious Systems Containing Fly Ash. Journal of Materials in Civil Engineering, 33(4), 04021015.
  • Han, S., Yan, P., & Kong, X. (2011). Study on the compatibility of cement-superplasticizer system based on the amount of free solution. Science China Technological Sciences, 54(1), 183-189.
  • Karakuzu, K., Kobya, V., Mardani-Aghabaglou, A., Felekoğlu, B., & Ramyar, K. (2021). Adsorption properties of polycarboxylate ether-based high range water reducing admixture on cementitious systems: A review. Construction and Building Materials, 312, 125366.
  • Liu, M., Gao, Y., Zhang, L., Jiang, G., Zeng, C., & Wang, P. (2021). The application of thermal analysis to study the hydration behavior of tricalcium aluminate-gypsum in the presence of polycarboxylate-based superplasticizers. Thermochimica Acta, 696, 178821.
  • Mardani-Aghabaglou, A. (2016). Investigation of cement-superplasticizer admixture compatibility (Doctoral dissertation, PhD Thesis. Turkey, Izmir, Ege University, Engineering Faculty, Civil Engineering Department).
  • Özen, S., Altun, M. G., Mardani‐Aghabaglou, A., & Ramyar, K. (2021). Effect of main and side chain length change of polycarboxylate‐ether‐based water‐reducing admixtures on the fresh state and mechanical properties of cementitious systems. Structural Concrete, 22, E607-E618.
  • Zingg, A., Winnefeld, F., Holzer, L., Pakusch, J., Becker, S., Figi, R., & Gauckler, L. (2009). Interaction of polycarboxylate-based superplasticizers with cements containing different C3A amounts. Cement and Concrete Composites, 31(3), 153-162.
There are 8 citations in total.

Details

Primary Language Turkish
Subjects Engineering
Journal Section Articles
Authors

Kemal Karakuzu 0000-0002-1023-3962

Veysel Kobya This is me 0000-0002-1226-8405

Ali Mardani 0000-0003-0326-5015

Project Number 219M425
Early Pub Date June 30, 2022
Publication Date July 15, 2022
Published in Issue Year 2022 Issue: 37

Cite

APA Karakuzu, K., Kobya, V., & Mardani, A. (2022). Reolojik Parametreleri Ölçülebilen Farklı C3A Oranına Sahip Hamur Karışımlarında Optimum Su Azaltıcı Katkı Dozajının ve Su Muhtevasının Belirlenmesi. Avrupa Bilim Ve Teknoloji Dergisi(37), 17-20. https://doi.org/10.31590/ejosat.1125646