Compressive strength and microstructure of alkali-activated blast furnace slag/sewage sludge ash (GGBS/SSA) blends cured at room temperature
Scholar | Other documents of the author: Tashima, M. M.; Reig Cerdá, Lucía; Santini Jr., M.A.; Moraes, J.C.B.; Akasaki, J.L.; Payá, J.; Borrachero, M. V.; Soriano, L.
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TitleCompressive strength and microstructure of alkali-activated blast furnace slag/sewage sludge ash (GGBS/SSA) blends cured at room temperature
In the present work, ground granulated blast furnace slag (GGBS) and sewage sludge ash (SSA) blends were assessed for the production of alkali-activated pastes and mortars. Percentages of SSA to substitute GGBS ... [+]
In the present work, ground granulated blast furnace slag (GGBS) and sewage sludge ash (SSA) blends were assessed for the production of alkali-activated pastes and mortars. Percentages of SSA to substitute GGBS ranged from 0–30 wt.% and sodium concentrations of 6–10 mol.kg-1 were used for the activating solutions. Pastes and mortars were cured at 20 ºC for up to 90 days. Raw materials were characterised by granulometric analysis, XRF, XRD, FTIR and SEM techniques. The replacement percentage of GGBS by SSA and the sodium hydroxide concentration of the alkaline activator were optimised to produce mortar with compressive strengths close to 30 MPa after 28 curing days at room temperature. Best results were obtained in samples blended with 20 wt.% SSA activated with 6 mol.kg-1 NaOH solutions which, according to the XRD, FTIR and microscopic results, contained higher amounts of (N,C)-A-S-H gel. The potential use of SSA for the development of alternative cementitious materials at room temperature has been demonstrated. [-]
Investigation projectThe authors acknowledge FAPESP (processo 2013/25254-5), Santander Universidades (program: “Becas Iberoamérica Jóvenes Profesores Investigadores España 2014”, grant to Lucia Reig), CNPq (nº 14/2013 processo 478057/2013-0) and the scanning electron microscopy services of FEIS/UNESP.
Bibliographic citationTashima, M. M., Reig, L., Santini, M. A., Moraes, J. B., Akasaki, J. L., Payá, J., ... & Soriano, L. (2017). Compressive Strength and Microstructure of Alkali-Activated Blast Furnace Slag/Sewage Sludge Ash (GGBS/SSA) Blends Cured at Room Temperature. Waste and Biomass Valorization, 8(5), 1441-1451.
"This is a post-peer-review, pre-copyedit version of an article published in Waste and Biomass Valorization. The final authenticated version is available online at: https://doi.org/10.1007/s12649-016-9659-1”.
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