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Ingeniería y Ciencia

Print version ISSN 1794-9165

Abstract

GORDILLO, Marisol; RODRIGUEZ, Erich D  and  MEJIA DE GUTIERREZ, Ruby. Mechanical Strength Optimization of Alkali-Activated MK/GBFS Binary Cements Through the Response Surface Methodology. ing.cienc. [online]. 2014, vol.10, n.19, pp.197-220. ISSN 1794-9165.

The present article shows the compressive strength modeling and optimization for a non-conventional binder free of clinker, which was produced by the alkali activation of a binary mixture of metakaolin (MK) and a granulated blast furnace slag (GBFS). A GBFS/(GBFS+MK) ratio between 0,0 and 0,8; and the overall SiO2Al2O3 molar ratio from 2,8 to 4,2 were considered as the main factor of this study. Sodium hydroxide and sodium silicate were used as alkali activator. The overall SiO2Al2O3 molar ratio corresponds to the silica and alumina contribution from the precursor (MK+GBFS), as well as the alkali activator used. The statistical assessment through response surface methodology (MSR) showed a considerable effect between the SiO2Al2O3 molar ratio, GBFS content and the compressive strength. Complementary, a microstructural characterization of the materials produced through X-ray diffraction (XRD) and scanning electron microscopy (SEM) was performed. The GBFS inclusion leads to an increasing of reaction kinetic and the formation of a more compact structure. These new reaction products gives to the material a higher mechanical performance than those based on a 100% of MK. The study shows the performance prediction in materials with 7 days of curing through the adjustment of some design criteria in order to obtain a binder with a particular mechanical performance.

Keywords : granulated blast furnace slag; metakaolin; alkali-activated binders; compressive strength; response surface methodology.

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