@article{Istuque_Soriano_Borrachero_Payá_Akasaki_Melges_Tashima_2021, title={Evaluation of the long-term compressive strength development of the sewage sludge ash/metakaolin-based geopolymer}, volume={71}, url={https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/2323}, DOI={10.3989/mc.2021.13220}, abstractNote={<p>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.</p>}, number={343}, journal={Materiales de Construcción}, author={Istuque, D. and Soriano, L. and Borrachero, M.V. and Payá, J. and Akasaki, J.L. and Melges, J.L.P. and Tashima, M.M.}, year={2021}, month={Jul.}, pages={e254} }