| Popis: |
Geopolymers are considered alternative materials to ordinary Portland cement (OPC) with similar or superior properties. SiC imparts interesting thermal and mechanical properties to cementitious materials. However, its effects on geopolymeric matrices remain poorly understood, although it can improve the matrix. In this work, the effect of incorporating 0.10%, 0.20%, and 0.50% (wt) of silicon carbide microwhiskers (SCMW) into a metakaolin-based geopolymer matrix was studied. The rotational rheology, mechanical properties, and thermal behavior were evaluated using isothermal calorimetry and thermogravimetric analysis. The results showed that the SCMW modified the rheological parameters of the geopolymer, increasing the viscosity at higher content and slightly modifying the velocity of the reaction. Meanwhile, the composite with 0.20% SCMW content showed better mechanical performance after 28 days, although the composite with 0.50% SCMW content had a similar or higher increase in mechanical performance after 24 h, comparing compressive and flexural strength respectively. However, these results are because of the SCMW properties rather than any new phases formed. |
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