The Effect of Curing Medium on the Physico-mechanical Properties of Alkali-activated Slag

M.M. Elwan1, H. El-Didamony2, S.M. Hafeez2

1 Tabbin Institute for Metallurgical Studies, Helwan, Egypt
2 Zagazig University, Faculty of Science, Chemistry department, Zagazig, Egypt


Volume 4, Issue 4, Pages 71 - 76


Blast furnace slag is a by-product from the production of pig-iron, which has caused some pollution problems in the area around the Steel Iron Company in Helwan/EG. The utilization of this waste product in the production of any product therefore saves money and prevents pollution of the atmosphere. Alkali-activated Slag (AAS) is a binder that can be used as a substitute for Ordinary Portland Cement (OPC) thanks to its ability to resolve most of the problems associated with OPC.AAS can be prepared by the activation of granulated slag by an activator. In this research work the granulated slag is activated with 2, 4, 6 and 8 mass-% NaOH and cured in humidity and under tap water. A comparative study of the physico-mechanical properties in the two curing conditions was investigated. The results revealed that curing in humidity (100 % RH) is better than under tap water as there is no leaching of certain materials.


alcali-activated slag, pig iron


[1] Roy, D.M.: Alkali-activated cements: opportunities and challenges. Cem. Concr. Res. 29 (1999) [2] 249–54


[2] Talling, B.; Brandstetr, J.: Clinker-free concrete based on alkali-activated slag. In: Ghosh, S.N., (ed.). Mineral admixtures cement concrete. India, ABI Books 1993, 296–341


[3] Field, F.R.; Clark, J.P.; Ashby, M.F.: Market drivers for materials and process development in the 21st century. Mater. Res. Soc. Bull (2000)


[Sept] 716–725


[4] Gifford, P.M.; Gillot, J.E.: Freeze thaw durability of activated blast furnace slag cement concrete. ACI Mater J. 93 (1996) 242–245


[5] Pu, X.C.; Gan, C.C.; Yang, C.H.: Summary reports of research on alkali-activated slag cement and concrete. Vol. 1–6. Chongqing Institute of Architecture and Engineering, Chongqing 1988


[6] Glukhovsky, V.D.: Slag alkali concretes produced from fine-grained aggregate. Kiev 1978


[7] Glukhovsky, V.D.; Pakhamov, V.A.: Slag alkali cements and concretes. Kiev 1978


[8] Richarson, J.M.; et al.: Stoichiometry of slag hydration with calcium hydroxide. J. Am. Ceram. Soc. 85 (2002) 947–953


[9] Paramesaran, P.S.; Chatterjee, A.K.: Alkali activation of Indian blast furnace slags. Proceedings of the 8th International Congress on Chemistry of Cement, Vol. IV, Theme 3, Rio de Janeiro 1996, 86–91


[10] Zivica, V.: Effects of type and dosage of alkaline activator and temperature on the properties of alkali-activated slag mixtures. Const. and Build. Mater. 21 (2007) [7] 1463–1469


[11] Shi, C.; Day, R.L.: Early hydration characteristics of alkali slag cements. Cem. Concr. Res. 25 (1995) [6] 1333–1346


[12] Slota, R.J.: Utilisation of water glass as an activator in the manufacturing of cementitious materials from waste by-products. Cem. Concr. Res. 17 (1987) 703–708


[13] Zivica, V.: Alkalisilicate admixture for cement composites, incorporating pozzolana or blast furnace slag. Cem. Concr. Res. 23 (1993) 1215–1220


[14] Zivica, V.: Admixture accelerating the hardening of silicate composites. J. Build Res. 42 (1994) 319–326


[15] Zivica, V.: Possibilities of a novel use of silica fume in mineral binding systems. J. Const. Build. Mater. 13 (1999) [5] 271–277


[16] Rousekova, I.; Bajza, A.; Zivica, V.: Silica fume – basic blast furnace slag systems activated by alkali silica fume activator. Cem. Concr. Res. 2 (1997) 1825–1828


[17] Buchwald, A.; Schulz, M.: Alkali activated binders by use of industrial by-products. Cem. Concr. Res. 35 (2005) 968–973


[18] Brough, A.R.; et al.: Microstructural aspects of zeolite formation in alkali-activated cements containing high levels of fly ash. J. Mater. Res. Soc. Symp. Proc. 37 (1995) 199–208


[19] Brough, A.R.; Atkinson, A.: Sodiumsilicate-based, alkali-activated slag mortars: Part 1. Strength hydration and microstructure. Cem. Concr. Res. 32 (2002) 865–79


[20] Alonso, S.; Palomo, A.: Calorimetric study of alkaline activation of calcium hydroxide and metakaolin solid mixture. Cem. Concr. Res. 31 (2001) 25–30


[21] Grnizo, M.L.; et al.: Alkaline activation of metakaolin – effect of calcium hydroxide in the products of reaction. J. Am. Ceram. Soc. 85 (2002) 225–231


[22] Jeffery, P.G.: Chemical methods of rock analysis. 2nd ed., Oxford 1978


[23] Regourd, M.: Structure and behaviour of slag Portland cement hydrates, Proceedings 7th Int. Congr. Chem. Cem., (Paris 1980), Edition Septima Paris V. 1, III–2–18 (1980a)


[24] Yip, C.K.; Deventer, V.: Microanalysis calcium silicate hydrate gel formed within a geopolymeric binder. J. Mater. Sci. 38 (2003) 3851– 3860


[25] Zhong, M.H.; Gjorv, O.E.: Effect of silica fume on cement hydration in low porosity cement pastes. Cem. Concr. Res. 21 (1991) [5] 800–808



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