Compressive strength and microstructure of alkali-activated blast furnace slag/sewage sludge ash (GGBS/SSA) blends cured at room temperature

[EN] 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 to 30 wt% and sodium concentrations of 6¿10 mol kg-1 were used for the...

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Detalles Bibliográficos
Autores: Mitsuuchi Tashima, Mauro|||0000-0003-0885-9293, Paya Bernabeu, Jorge Juan|||0000-0001-7425-5311, Borrachero Rosado, María Victoria|||0000-0002-7873-0658, Soriano Martinez, Lourdes|||0000-0002-5749-4609, Reig, L., Santini, M. A., Jr., Moraes, J.C.B, Akasaki, J. L.
Tipo de recurso: artículo
Fecha de publicación:2017
País:España
Institución:Universitat Politècnica de València (UPV)
Repositorio:RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
Idioma:inglés
OAI Identifier:oai:riunet.upv.es:10251/154503
Acceso en línea:https://riunet.upv.es/handle/10251/154503
Access Level:acceso abierto
Palabra clave:Sewage sludge ash
Waste management
Alkali-activated cement
Compressive strength
INGENIERIA DE LA CONSTRUCCION
Descripción
Sumario:[EN] 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 to 30 wt% and sodium concentrations of 6¿10 mol kg-1 were used for the activating solutions. Pastes and mortars were cured at 20 C 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.

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