Journal
CEMENT & CONCRETE COMPOSITES
Volume 104, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2019.05.015
Keywords
Geopolymer; Metakaolin; Carbon nanotubes; Mechanical properties
Funding
- National Council for Scientific and Technological Development (CNPq)
- Santa Catarina Research Foundation (FAPESC)
- National Institute on Advanced Eco-efficient Cement-based Technologies -CEMtec [465593/2014-3]
- Coordination for the Improvement of Higher Education Personnel -CAPES
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This study presents microstructural, rheological, and mechanical behavior of metakaolin-based geopolymer nanocomposite reinforced with multi-walled carbon nanotubes (CNTs). Two concentrations and two types of CNTs were added directly to the activating solution, sonicated, and then mechanically mixed with metakaolin to form the geopolymer paste. The results indicated that the effect on the rheological properties was not significant, irrespective of the type and quantity of CNTs used. When compared to a reference paste, improvements of 3.8%, 13.2% and 28.7% were observed in the Young's modulus, compressive and flexural strengths, respectively, with the addition of 0.1 wt% pristine-CNTs, due to matrix porosity refinement. However, with the addition of 0.2 wt% there were decreases of 3.5%, 11.8% and 31.0%, for Young'g modulus, compressive and flexural strengths, respectively, as result of an increase of 10.2% in the matrix total porosity. However, with the addition of 0.1 and 0.2 wt% functionalized-CNTs (f-CNTs), notable mechanical property improvements were observed - up to 31.6% and 46.6% for Young's modulus and compressive strength with 0.2 wt% f-CNTs, and 66.0% for flexural strength with 0.1 wt% f-CNTs. These enhancements are explained by a reduction of 63.2 and 53.7%, for 0.1 and 0.2 wt % f-CNTs, respectively, in the macropore proportion of the matrix and a strong bond between the functionalized-CNTs and the geopolymer matrix.
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