Characterisation of Geopolymer Cements Obtained from Different Sources of Metakaolin

Oscar Ueno; S. Schwaab; D. Ganasini; M. Tomiyama; Marilena Valadares Folgueras; Sivaldo L. Correia

doi:10.4028/www.scientific.net/MSF.912.196

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HomeMaterials Science ForumMaterials Science Forum Vol. 912Characterisation of Geopolymer Cements Obtained...

Characterisation of Geopolymer Cements Obtained from Different Sources of Metakaolin

Abstract:

In the present study metakaolin and clay brick waste (CBW) were used as a source of silica and alumina along with precursors aiming to obtain geopolymer cements, which were characterised via scanning electron microscopy (SEM) and X-ray diffraction (XRD). The CBW was obtained from rejected clay brick industrial manufacturing process. The precursors were activated by using of 5.0, 10.0 and 15.0 [mol.L^-1] KOH solutions, which was added to K₂SiO₃ solution at 1:1 weight ratio. To obtain the geopolymer cements the weight ratio of precursor and activators were changed at levels of 0.6, 1.0 and 1.4. The samples were prepared and cured at room temperature for 7 days. The geopolymer cement obtained from metakaolin at 15 mol.L^-1 level of KOH concentration and KOH/K₂SiO₃ ratio of 1:1.4 provided the best cement which can be estimated by the largest reduction and dissolution of crystalline phases in the activation reaction.

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Materials Science Forum (Volume 912)

Pages:

196-201

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.912.196

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Online since:

January 2018

Authors:

Oscar Ueno, S. Schwaab, D. Ganasini, M. Tomiyama, Marilena Valadares Folgueras, Sivaldo L. Correia

Keywords:

Clay Brick Waste, Geopolymer Cement, Metakaolin, Microstructural Characterization

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