Materiales de Construcción, Vol 62, No 306 (2012)

Mechanical behaviour of alkali-activated blast furnace slag-activated metakaolin blended pastes. Statistical study


https://doi.org/10.3989/mc.2012.00111

I. Higuera
Universidad Politécnica de Madrid, Spain

C. Varga
Instituto de Ciencias de la Construcción Eduardo Torroja (IETcc- CSIC), Spain

J. G. Palomo
Universidad Politécnica de Madrid, Spain

A. Gil-Maroto
Instituto de Ciencias de la Construcción Eduardo Torroja (IETcc- CSIC), Spain

T. Vázquez
Instituto de Ciencias de la Construcción Eduardo Torroja (IETcc- CSIC), Spain

F. Puertas
Instituto de Ciencias de la Construcción Eduardo Torroja (IETcc- CSIC), Spain

Abstract


The study and development of alternative, more ecoefficient binders than portland cement are attracting a good deal of scientific and technological interest. Binders obtained from the chemical interaction between calcium silico-aluminous materials and highly alkaline solutions are one of several types of such possible cements. The present paper discusses the mechanical behaviour and mineralogical composition of blended pastes made from NaOH-activated vitreous blast furnace slag and metakaolin. The aim of the study was to determine how parameters such as the slag/metakaolin ratio, activating solution concentration and curing temperature affect strength development in these binders. A statistical study was conducted to establish the impact of each variable and model strength behaviour in these alkaline cements. The conclusion drawn is that activator concentration and the slag/metakaolin ratio are both determinant parameters.

Keywords


alkaline cements; blast furnace slag; mechanical strength; experimental design; ANOVA

Full Text:


PDF

References


(1) Puertas, F.: “Cementos de escorias activadas alcalinamente: situación actual y perspectiva de futuro”, Mater. Construcc., vol. 45, nº 239 (1995), pp. 53-64. http://dx.doi.org/10.3989/mc.1995.v45.i239.553

(2) Fernández-Jiménez, A.; Puertas, F.; Palomo, J. G.: Alkali-activated slag mortars: mechanical strength behaviour, Cem. Concr. Res., vol. 29 (1999), pp. 593-604.

(3) Brough, A. R.; Atkinson, A.: “Sodium silicate-based, alkali-activated slag mortars. Part I. Strength, Hydration and Microstructure”, Cem. Concr. Res., vol. 32 (2002), pp 865-879. http://dx.doi.org/10.1016/S0008-8846(02)00717-2

(4) Bakharev, T.; Sanjayan, J. G.; Cheng, Y. B.: “Sulfate attack on alkali-activated slag concrete”, Cem. Concr. Res., vol. 32 (2002), pp. 211-216. http://dx.doi.org/10.1016/S0008-8846(01)00659-7

(5) Bakharev, T.; Sanjayan, J. G.; Cheng, Y. B.: “Resistance of alkali-activated slag concrete to acid attack”. Cem. Concr. Res., vol. 33 (2003), pp 1607-1611. http://dx.doi.org/10.1016/S0008-8846(03)00125-X

(6) Puertas, F.; Mejía de Gutiérrez, R.; Fernández-Jiménez, A.; Delvasto, S.; Maldonado, J.: “Alkaline cement mortars. Chemical resistance to sulfate and seawater attack”, Mater. Construcc., vol., 52, nº 267 (2002), pp 55-71. http://dx.doi.org/10.3989/mc.2002.v52.i267.326

(7) Puertas, F.; Palacios, M.; Vázquez, T.: “Carbonation process of alkali-activated slag mortars”, Journal of. Material Science, 41, 2006, pp 3071-3082. http://dx.doi.org/10.1007/s10853-005-1821-2

(8) Granizo, M. L.; Blanco, M. T.; Puertas, F.; Palomo, A.: “Alkaline activation of metakaolin; influence of synthesis parameters”, Proceedings of the 10th I.C.C.C., Goteborg, vol. 3 (2002), p. 3ii113.

(9) Puertas, F.; Fernández-Jiménez, A.; Blanco, M. T.: “Pore solution in alkali-activated slag cement pastes. Relation to the composition and structure of calcium silicate hydrate”, Cem. Concr. Res., vol. 34 (2004), pp. 195-206. http://dx.doi.org/10.1016/S0008-8846(03)00254-0

(10) Fernández-Jiménez, A.; Palomo, A.; Sobrados, I.; Sanz, J.: “The role played by the reactive alumina contenting the alkaline activation of fly ashes”, Micropor. Mesopor. Mater, vol. 91 (1-3) (2006), pp. 111-119. http://dx.doi.org/10.1016/j.micromeso.2005.11.015

(11) Sánchez, R.; Palacios, M.; Puertas, F.: “Cementos petroleros con adición de scoria de horno alto. Características y propiedades”, Mater. Construcc., vol. 61, nº 302 (2011), pp. 185-211.

(12) Puertas, F.; Martínez-Ramírez, S.; Alonso, A.; Vázquez, T.: “Alkali-activated fly ash/slag cement. Strength behaviour and hydration products”, Cem. Concr. Res., vol. 30 (2000), pp. 1625-1632. http://dx.doi.org/10.1016/S0008-8846(00)00298-2

(13) Puertas, F.; Fernández-Jiménez, A.: “Mineralogical and microstructural characterization of alkali-activated fly ash/slag pastes”, Cem. Concr. Res., vol. 23 (2003), pp. 287-293.

(14) Chao, Li, Henghy, Sun, Longtu, Li: “A review: The comparison between alkali-activated slag (Si+Ca) and metakaolin (Si+Al) cements”, Cem. Concr. Res, vol. 40 (2010), pp. 1341-1349. http://dx.doi.org/10.1016/j.cemconres.2010.03.020

(15) Buchwald, A.; Hilbig, H.; Kaps, Ch.: “Alkali-activated metakaolin-slag blends-performance and structure in dependence of their composition”, Journal of Material Science, vol. 42 (2007), pp. 3024-3032. http://dx.doi.org/10.1007/s10853-006-0525-6

(16) Bernal, S.: Carbonatación en concretos producidos a partir de sistemas binarios de una escoria siderúrgica y un metacaolín activados alcalinamente, tesis doctoral (2009), Universidad del Valle (Cali, Colombia).

(17) Buchwald, A.; Tatarin, R.; Stephan, D.: “Reaction progress of alkaline-activated metakaolin-ground granulated blast furnace slag blends”, J. Mater. Sci., vol. 44 (2009), pp. 5609-5617. http://dx.doi.org/10.1007/s10853-009-3790-3

(18) Bernal, S. A.; Rodríguez, E. D.; Mejía de Gutiérrez, R.; Gordillo, M.; Provis, J. L.: “Mechanical and thermal characterization of geopolymers based on silicate-activated metakaolin/slag blends”, J. Mater. Sci., vol. 46 (2011), pp. 5477-5486. http://dx.doi.org/10.1007/s10853-011-5490-z

(19) Yip, C. K.; Lukey, G. C.; van Deventer, J. S. J.: “The coexistence of geopolymeric gel and calcium silicate hydrate at the early stage alkaline activation”, Cem. Concr. Res., vol. 35 (2005), pp.1688-1697. http://dx.doi.org/10.1016/j.cemconres.2004.10.042

(20) Puertas, F.; Palacios, M.; Manzano, H.; Dolado, J. S.; Rico, A.; Rodríguez, J.: “Model fort he C-A-S-H gel formed in alkali-activated slag cements”, Journal of European Ceramic Society, vol. 31 (2011), pp. 2043-2056. http://dx.doi.org/10.1016/j.jeurceramsoc.2011.04.036

(21) Goñi, S.; Guerrero, A.; Puertas, F.; Hernández, M. S.; Palacios, M.; Dolado, J. S.; Zhu, W.; Howind, T.: “Textural and mechanical characterization of C-S-H gels from hydration of synthetic T1-C3S, ‚-C2S and their blends”, Mater. Construcc., vol. 61, nº 302 (2011), pp. 169-183.

(22) Granizo, M. L.: Activación alcalina de metacaolín: Desarrollo de nuevos materiales cementantes, tesis doctoral, Universidad Autónoma (1998).

(23) Fernández-Jiménez, A.; Palomo, A; Criado, M.: “Microstructure development of alkali-activated fly ash cement: A descriptive model”, Cem. Concr. Res., vol. 35 (6) (2005), pp. 1204-1209. http://dx.doi.org/10.1016/j.cemconres.2004.08.021




Copyright (c) 2012 Consejo Superior de Investigaciones Científicas (CSIC)

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.


Contact us materconstrucc@ietcc.csic.es

Technical support soporte.tecnico.revistas@csic.es