Evaluation of the long-term compressive strength development of the sewage sludge ash/metakaolin-based geopolymer
DOI:
https://doi.org/10.3989/mc.2021.13220Keywords:
Alkali-activated cement, Metakaolin, Compressive strength, Mortar, Scanning electron microscopyAbstract
This paper aimed to evaluate the long-term compressive strength development of the sewage sludge ash/metakaolin (SSA/MK)-based geopolymer. SSA/MK-based geopolymeric mortars and pastes were produced at 25ºC with different SSA contents (0 - 30 wt.%). Compressive strength tests were run within the 3-720 curing days range. A physicochemical characterisation (X-ray diffraction and scanning electron microscopy) was performed in geopolymeric pastes. All the geopolymeric mortars presented a compressive strength gain with curing time. The mortars with all the SSA evaluated contents (10, 20, 30 wt.%) developed a compressive strength over 40 MPa after 720 curing days at 25ºC. The maximum compressive strength of the mortars with SSA was approximately 61 MPa (10 wt.% of SSA), similarly to the reference mortar (100% MK-based geopolymer). The microstructure analyses showed that the SSA/MK-based geopolymer presented a dense microstructure with N-A-S-H gel formation.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Grant numbers Finance Code 001 and CAPES/DGU n. 266/12
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Grant numbers n. 14/2013, process 478057/2013-0 and 309015/ 2015-4