Abstract

DIAZ-VILLAMIL, CARLOS ARTURO; ALZATE-RAMIREZ, ALBERT LEONARD  and  ARIAS-JARAMILLO, YHAN PAUL. Mechanical and mineralogical evaluation of a metakaolin cement using the surface response method. Rev.EIA.Esc.Ing.Antioq [online]. 2020, vol.17, n.33, pp.119-130. ISSN 1794-1237.  https://doi.org/10.24050/reia.v17i33.1336.

In this work, an alkaline cement based on Colombian metakaolin (MK) is developed. The activators used: 15% by mass of Na 2SiO3 and Na(OH) and Ca(OH)2 were varied in different molar concentrations following a statistical experimental design with response surface model. The variable response, mechanical resistance to compression, was evaluated in cylindrical paste specimens at 7 and 14 days of curing at 40 ° C. The X-ray diffraction tests identified the mineralogical and cementing phases present in the pulp product of the alkaline synthesis.

The results analyzed through statistical software allowed, through the ANOVA, to identify a high level of significance in the Na(OH) factor as well as the increasing effect in the response variable, while the Ca(OH)2 presented a curvature effect in the explored region. Mechanical strengths in the order of 34 MPa account for the formation of cementing phases as well as the presence of type A zeolites (Na2Al2Si1185O77 5.1(H2O)) in the result DRX.

Keywords : Alkaline activation; molar ratios; cements; metakaolin; DOE.

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