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Ingeniería, investigación y tecnología
On-line version ISSN 2594-0732Print version ISSN 1405-7743
Abstract
VILLAQUIRAN-CAICEDO, Mónica Alejandra; RODRIGUEZ, Erich David and MEJIA-DE GUTIERREZ, Ruby. Microstructure Assessment of Metakaolin Based-Geopolymers Produced with Alternative Silica Sources Exposed to High Temperatures. Ing. invest. y tecnol. [online]. 2015, vol.16, n.1, pp.113-122. ISSN 2594-0732.
Ceramic materials more environment friendly and with similar or even better performance than traditional ones can be produced by alkali activation of natural minerals, wastes or industrial by-products. The present study assesses the effect of exposure at 600° and 1200°C of a MK-based geopolymers. Rice husk ash (RHA) and silica fume were modified chemically in order to obtain an alternative alkali activator. Exposure to elevated temperatures leads to dehydration of the reaction products and structural reorganization associated with the crystallization of the gel to leucite (KAlSi2O6) and kalsilite (KAlSiO4). The structural changes associated with the thermal treatment also promote a densification and reduction of porosity. The unreacted MK particles embedded into the geopolymeric gel lead to the formation of mullite (2Al2O3 · SiO2) after the thermal treatment at 1200°C.
Keywords : geopolymer; high temperatures; metakaolin; rice husk ash; silica fume.