Süleyman Bahadır KESKİN, Özlem KASAP KESKİN, Gizem TÜREDİ

KALSİYUM ALÜMİNATLI ÇİMENTO KULLANIMI İLE KENDİLİĞİNDEN YERLEŞEN HARÇ ÜRETİMİ

Bu çalışmanın amacı, kalsiyum alüminatlı çimento ile kendiliğinden yerleşen harç üretmektir. Kendiliğinden yerleşen harçların vibrasyon işlemine ihtiyaç duymadan doldurma ve geçme kabiliyeti gibi avantajları ile kalsiyum alüminatlı çimentoların aşınma direnci, yüksek ısıl dayanıklılık, yüksek asit direnci, yüksek erken dayanım gibi üstün özelliklerinin birleştirilmesi amaçlanmaktadır. Bununla birlikte, kalsiyum alüminatlı çimentoların hidratasyonu ileriki yaşlarda dayanım kayıplarına yol açabilmektedir. Bu sebeple, dayanım kaybı ihtimalini önlemek amacıyla, alçı, uçucu kül, öğütülmüş granüle yüksek fırın cürufu, silis dumanı gibi ilave bağlayıcı malzemelerden harç karışımlarında yararlanılmıştır. Bu bağlamda, 11 farklı kendiliğinden yerleşen harç üretilmiştir ve bu harçların yayılma, priz süresi, aşınma dirençleri ve 1, 2, 7, 28 ve 90 günlük eğilme ve basınç dayanımları belirlenmiştir. Test sonuçları ilave bağlayıcıların harç karışımlarında farklı davranışlar sergilediğini göstermiştir. Sonuç olarak, kalsiyum alüminatlı çimento ile kendiliğinden yerleşen harç üretiminin mümkün olduğu görülmüştür.

SELF-COMPACTING MORTAR PRODUCTION BY USING CALCIUM ALUMINATE CEMENT

The aim of this study is to produce self-compacting mortar with calcium aluminate cement. The advantages of self-compacting mortars like filling and passing ability without the need of vibration process and the superior properties of calcium aluminate cement like abrasion resistance, high thermal resistance, high acid resistance, and high early strength are intended to be combined. However, hydration process of calcium aluminate cement might cause strength reduction at later ages. Therefore, in order to prevent the possibility of strength reduction, several supplementary binders such as gypsum, fly ash, ground granulated blast furnace slag and silica fume were utilized in the mortar mixtures. In this sense, 11 different self-compacting mortars were produced, and those mortars were tested to obtain values of mini slump flow, setting time, abrasion resistance and 1, 2, 7, 28, and 90 day flexural and compressive strength. Test results showed that different supplementary binders exhibited different behaviors in mortar mixtures. As a conclusion, it was seen that the production of self-compacting mortar with calcium aluminate cement was possible.

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[1] Nunes, S. and Costa, C., "Numerical Optimization of self-compacting mortar mixture containing spent equilibrium catalyst from oil refinery", Journal of Cleaner Production, 158: 109-121, 2017.
[2] Tuaum, A., Shiote, S.M. and Oyaawa, W., "Experimental study of self-compacting mortar incorporating recycled glass aggregate", Buildings, 8(2): 1-15, 2018.
[3] Navarro-Blasco, I., Fernandez, J.M., Duran A., Sirera, R. and Alvarez, J.I., “A novel use of calcium aluminate cements for recycling waste foundry sand (WFS)”, Construction and Building Materials, 48: 218-228, 2013.
[4] Garces, P., Zornoza, E., Alcocel, E.G., Galao, O. and Andion, L.G., “Mechanical properties and corrosion of CAC mortars with carbon fibers”, Construction and Building Materials, 34: 91-96, 2012.
[5] Maaroufi, M., Lecomte, A., Diliberto, C., Francy, O. and Le Brun, P., "Thermo-hydrous behavior of hardened cement paste based on calcium aluminate cement", Journal of the European Ceramic Society, 35: 1637-1646, 2014.
[6] Luz, A.P. and Pandolfelli, V.C., "Halting the calcium aluminate cement hydration process", Ceramics International, 37: 3789-3793, 2011.
[7] Silva, A.P., Segades, A.M., Pinto, D.G., Oliveira, L.A. and Devezas, T.C., "Effect of particle size distribution and calcium aluminate cement on the rheological behaviour of all-alumina refractory castables", Powder Technology, 226: 107-113, 2012.
8] Antonovic, V., Keriene, J., Boris R. and Aleknevicius M., "The Effect of Temperature on the Formation of the Hydrated Calcium Aluminate Cement Structure", Procedia Engineering, 57: 99-106, 2013.
[9] Damidot, D. and Rettel, A., “Effect of Gypsum on CA and C12A7 Hydration at Room Temperature”, 11th International Congress on the Chemistry of Cement, 2003, 0-9584085-8-0.
[10] Fernandez-Carrasco, L. and Vazquez, E., "Reactions of fly ash with calcium aluminate cement and calcium sulphate", Fuel, 88: 1533- 1538, 2009.
[11] Lopez, A.H., Calvo, J.L.G., Olmo, J.G., Petit, S. and Alonso, M.C., “Microstructural Evolution of Calcium Aluminate Cements Hydration with Silica Fume and Fly Ash Additions by Scanning Electron Microscopy, and Mid and Near-Infrared Spectroscopy”, The American Ceramic Society, 91 [4] 1258-1265, 2008.
[12] Parr, C., Bin, L., Alt, C. and Wohrmeyer, C., “Interactions between silica fume and cac and methods to optimize castable placing properties”, Refractories Applications and News, 1: 12-18, 2007.
[13] Tanzer, R., Buchwald, A. and Stephan, D., “Effect of slag chemistry on the hydration of alkaliactivated blast-furnace slag”, Materials and Structures, 48: 629-641, 2015.
[14] Kırca, Ö., Yaman İ.Ö. and Tokyay M., “Compressive Strength Development of Calcium Aluminate Cement-GGBFS Blends”, Cement and Concrete Composites, 35: 163-170, 2013.
[15] Bizzozero, J. and Scrivener, K.L., “Limestone reaction in calcium aluminate cemen-calcium sulfate systems", Cement & Concrete Research, 76: 159-169, 2015.
[16] Samad, S. and Shah, A., “Role of binary cement including Supplementary Cementitious Material (SCM), in production of environmentally sustainable concrete: A critical review, International Journal of Sustainable Built Environment, 6, 663-674, 2017.
[17] Mostafa, N.Y., Zaki, Z.I. and Elkader, O.H.A., “Chemical activation of calcium aluminate cement composites cured at elevated temperature”, Cement & Concrete Composites, 34: 1187-1193, 2012.
[18] Felekoğlu B., Tosun K., Baradan B., Altun A., and Uyulgan B., “The effect of fly ash and limestone fillers on the viscosity and compressive strength of self-compacting repair mortars”, Cement and Concrete Research, 36: 1719-1726, 2006.
[19] Madduru, S.R.C., Pallapothu, S.N.R.G., Pancharathi, R.K., Garje, R.K. and Chakilam, R., “Effect of self-curing chemicals in selfcompacting mortars”, Construction and Building Materials, 107: 356-364, 2016.
[20] Şahmaran, M., Christianto, H.A. and Yaman, İ.Ö., “The effect of chemical admixture and mineral additives on the properties of self-compacting mortars”, Cement & Concrete Composites, 28: 432-440, 2006.
[21] Gowda, M.R. and Abhilash, D.T., “Development of self-compacting mortar mixes using agor based waste as a partial replacement to cement”, Indian Concrete Journal, 91(4): 87-92, 2017.
[22] Türedi, G., Production of Self-compacting Mortar with Calcium Aluminate Cement, M Sc Thesis, Muğla Sıtkı Koçman University, Muğla, 2019.
[23] Turk, K., “Viscosity and hardened properties of self-compacting mortars with binary and ternary cementitious blends of fly ash and silica fume”, Construction and Building Materials, 37: 326- 334, 2012.
[24] ASTM C143 / C143M-15, Standard Test Method for Slump of Hydraulic-Cement Concrete, Annual Book of ASTM Standards, Vol. 04.02, 2015.
[25] EFNARC, Specification and guidelines for selfcompacting concrete. European Federation for Specialist Construction Chemicals and Concrete Systems, Norfolk, UK, English ed., February 2002.
[26] ASTM C807 - 18, Standard Test Method for Time of Setting of Hydraulic Cement Mortar by Modified Vicat Needle, Annual Book of ASTM Standards, Vol. 04.01, 2018.
[27] Benabed, B., Kadri, E., Azzouz, L. and Kenai, S., “Properties of self-compacting mortar made with various types of sand”, Cement & Concrete Composites, 34(10): 1167-1173, 2012.
[28] ASTM C944 – 99, Standard Test Method for Abrasion Resistance of Concrete or Mortar Surfaces by the Rotating-Cutter Method, Annual Book of ASTM Standards, Vol.04.02, 2012.
[29] TS EN 196-1:2016, Methods of testing cement- Part 1: Determination of strength, Turkish Standards Institution, May 2016.
[30] Benli, A. and Karataş, M., “Uçucu kül ve silis dumanı ikameli karışımlardan üretilen kendiliğinden yerleşen harçların durabilite ve dayanım özellikleri”, DÜMF Mühendislik Dergisi, 10: 1 (2019): 335-345.
[31] Kırca, Ö., Temperature Effect of Calcium Aluminate Cement Based Composite Binders, PhD Thesis, Middle East Technical University, Ankara, 2006.
[32] Güneyisi, E. and Gesoğlu, M., “Properties of selfcompacting mortars with binary and ternary cementitious blends of fly ash and metakaolin”, Materials and Structure, 41: 1519-1531, 2008.
[33] Turk, K. and Karatas, M., “Abrasion Resistance and Mechanical Properties of Self-Compacting Concrete with Different Dosages of Fly Ash/Silica Fume, Indian Journal of Engineering and Materials Sciences, Vol. 18, February 2011.
[34] Khaliq, W. and Khan, H.A., “High temperature material properties of calcium aluminate cement concrete”, Construction and Building Materials, 94: 475-487, 2015.
[35] Courard, L., Michel, F. and Pierard, J., “Influence of clay in limestone fillers for self-compacting cement-based composites”, Construction and Building Materials, 25: 1356-1361, 2011.
[36] Benli, A., “Mechanical and durability properties of self-compacting mortars containing binary and ternary mixes of fly ash and silica fume”, Structural Concrete, pp: 1096-1108, 2019.
[37]Yang, H.J., Ann, K.Y. and Jung, M.S., “Development of Strength for Calcium Aluminate Cement Mortars Blended with GGBS”, Advances in Materials Science and Engineering, Volume 2019, Article ID 9896012.