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Potential for use of crushed waste calcined-clay brick as a supplementary cementitious material in Brazil |
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| Authors: | RD Toledo Filho JP Gonçalves EMR Fairbairn |
| Affiliation: | a Civil Engineering Department, COPPE, Universidade Federal do Rio de Janeiro, P.O. Box 68506, CEP 21941-972, Rio de Janeiro — RJ, Brazil b Departmento de Tecnologia, Universidade Estadual de Feira de Santana-UEFS, Av. Universitária, CEP 44031-460, Feira de Santana — BA, Brazil c MCT—Brazilian Ministry of Science and Technology, Praia do Flamengo, 200, Rio de Janeiro — RJ, Brazil |
| Abstract: | The Brazilian ceramic industry generates large amounts of calcined-clay waste. This paper examines the factors that influence its potential for use as a partial replacement of Portland cement. Superplasticized mortars of equal workability containing ground crushed waste calcined-clay brick (GCWCCB) in the proportions of 10, 20, 30 and 40% as a cement replacement were analyzed through mechanical tests, pore structure characterization and durability tests. The results indicated the optimal percentages of substitution lies between 10% to 20%. The potential reduction of CO2 emissions could be as high as 10% of current Brazilian cement industry emissions if this approach were to be fully implemented, and it could be eligible for “Clean Development Mechanism” credits under Kyoto protocol. |
| Keywords: | Calcined clay (D) Microstructure (B) Mechanical properties (C) Durability (C) CO2 emissions (E) |
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