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Blending of industrial waste from different sources as partial substitution of Portland cement in pastes and mortars

2014; Elsevier BV; Volume: 66; Linguagem: Inglês

10.1016/j.conbuildmat.2014.05.089

1879-0526

F. Javier Baeza, J. Payá, Ó. Galao, José Miguel Saval, P. Garcés,

Recycled Aggregate Concrete Performance

Binary and ternary combinations of sewage sludge ash (SSA) with marble dust (MD), fly ash (FA) and rice husk ash (RHA) as replacement in Portland cement pastes, were assessed. Several tests were carried out at different curing ages: thermogravimetry, density, water absorption, ultrasonic pulse velocity and mechanical strengths. Pozzolanic effects of the mineral admixtures, densities similar to control sample and improved absorptions when combining waste materials were identified. In general, the compressive strength reaches or exceeds the cement strength class, and blending SSA, FA and RHA (30% cement replacement) increase of strength by 9%, compared to the control sample, was achieved.