EFFECT OF CALCIUM NITRATE, TRIETHANOLAMINE AND TRIISOPROPANOLAMINE ON COMPRESSIVE STRENGTH OF MORTARS

Yıl 2015, Cilt: 1 Sayı: 1, 12 - 19, 08.01.2016

Saadet Gök , Kadir Kılınç

Öz

Chemical admixtures are used in concrete for various purposes such as water reducing, plasticizing, air entraining, bonding, viscosity modifying, colouring, corrosion inhibiting, permeability reducing, accelerating or retarding the initial setting time, and shrinkage reducing. The use of chemical admixtures in concrete helps to improve workability of fresh concrete and durability properties of hardened concrete as well as reducing the total cost of concrete production. In this study, three different types of chemical raw materials (calcium nitrate, triethanolamine-TEA and triisopropanolamine-TIPA) were used in the production of chemical admixtures, which were used in mortars with two different cement compositions. 7-day and 28-day compressive strengths of mortars were determined and it was found that TIPA has the greatest effect on increasing the compressive strength within these three chemicals.

Anahtar Kelimeler

-

Kaynakça

• ACI Committee 306, ACI 306R-10, 2010. “Guide to Cold Weather Concreting”, American Concrete Institute, Detroit, Michigan.
• Myrdal, R., 2007. “Accelerating admixtures for concrete”, SINTEF Report, Norway. ISBN: 978-82-536-0989-8.
• ACI 212.3R-04, 2004. “Chemical Admixtures for Concrete”, The American Concrete In-stitute, Committee Report, Detroit, Michigan.
• Karagöl, F., Demirboğa, R., Kaygusuz, M. A., Yadollahi, M. M., Polat, R., 2013. The in-fluence of calcium nitrate as antifreeze admixture on the compressive strength of concrete exposed to low temperatures, Cold Regions Science and Technology, 89, pp. 30-35.
• Hewlett, P. C., 1998. Lea’s Chemistry of Cement and Concrete, Fourth Edition, Arnold, London, pp. 837-901.
• Ramachandran, V. S., 1995. Concrete Admixtures Handbook, Second edition, pp. 185-285.
• Heinz, D., Göbel, M., Hilbig, H., Urbonas, L., Bujauskaite, G., 2010. Effect of TEA on fly ash solubility and early age strength of mortar, Cement and Concrete Research, 40, pp. 392-397.
• Ichikawa, M., et al., 1997. Effect of Triisopropanolamine on Hydration and Strength Development of Cements with Different Character, Proceedings 10th International Congress on the Chemistry of Cement, Gothenburg (Edited by H Justnes), Sweden, June 2-6.
• Aggoun, S., et al., 2008. Effect of some admixtures on the setting time and strength evolution of cement pastes at early ages, Construction and Building Materials, 22, pp. 106-110.
• Sandberg, P. J., Doncaster, F., 2004. On the mechanism of strength enhancement of cement paste and mortar with triisopropanolamine, Cement and Concrete Research, 34, pp. 973-976.
• TS EN 12390, 2002. “Testing hardened concrete”, Turkish Standards Institution, Ankara.