Influence of the use of sewage sludge ash (SSA) as cementitious materials on mortar and concrete properties
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Tipus de documentComunicació de congrés
Data publicació2011
EditorInstituto de Ciencias de la Construcción Eduardo Torroja. Consejo Superior de Investigaciones Científicas (IETcc-CSIC)
Condicions d'accésAccés restringit per decisió de l'autor
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Abstract
Sewage sludge ash (SSA) is a waste material obtained from the incineration of wastewater sludge. The aim of this paper is to evaluate the effect of the use of SSA, as substitution for rapid hardened Portland cement CEM I 52.5R, on the properties of mortar and concrete. The physical, chemical and mineralogical characterization of raw and grinding SSA were determined. Mortars with 10%, 15% and 20% of two types of SSA of replacement of cement were produced. Flexural and compressive strength were determined in all mortars produced. Due to adequate properties of mortars made with grinding SSA, modulus of elasticity and sorptivity of those mortars were found out. Concretes with 10%, 20% and 30% of grinding SSA of replacement of cement were produced and fresh and mechanical properties of all concretes were determined. The obtained results were compared with respect to those of control mortars made with CEM I 52.5 R and CEM II/ A-L 42.5R. The mortars with SSA achieved lower mechanical properties than control mortar made with CEM I 52.5R, however the reduction of compressive strength of mortar was lower than 8% when milled SSA was used. Those mortars obtained higher flexural strength than control mortar. The modulus of elasticity and the sorptivity of mortars with milled SSA were worse than those of control mortar made with CEM I 52.5R and better than those of control mortar made with CEM II/ A-L 42.5R. Due to moderate pozzolanic activity, the mortar made with any type of SSA obtained higher mechanical properties than control mortar made with CEM II A-L 42.5R. This implies that SSA-blended cement prepared with 52.5 strength category type I cement with up to 20% substitution could be considerate as a control mortar made with 42.5 strength type II cement. Low reduction of compressive strength occurred concrete made with milled SSA, however higher splitting tensile strength and modulus of elasticity obtained than those of control concrete made with CEM I 52.5R after 28 days of curing due to adequate interface between cement paste and aggregates. All concretes with SSA achieved higher mechanical properties than those of control concrete made with CEM II A-L 42.5R. The mechanical properties of concretes made with SSA improved after 90 days of curing.
CitacióEtxeberria, M.; Valls, S. Influence of the use of sewage sludge ash (SSA) as cementitious materials on mortar and concrete properties. A: International Congress on the Chemistry of Cement. "Cementing a sustainable future: XIII ICCC International Congress on the Chemistry of Cement Madrid, 3-8 july, 2011: abstracts and proceedings". Instituto de Ciencias de la Construcción Eduardo Torroja. Consejo Superior de Investigaciones Científicas (IETcc-CSIC), 2011, p. 131. ISBN 84-7292-399-7.
ISBN84-7292-399-7
Altres identificadorshttps://goo.gl/3q34C
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EtxeberriaM_VallsS_april2011.pdf | 489,4Kb | Accés restringit |