Materiales de Construcción, Vol 64, No 315 (2014)

Synthesis and mechanical properties of a calcium sulphoaluminate cement made of industrial wastes


https://doi.org/10.3989/mc.2014.04513

M. Gallardo
CINVESTAV (Ramos Arizpe, Coah, México), Mexico

J. M. Almanza
CINVESTAV (Ramos Arizpe, Coah, México), Mexico

D. A. Cortés
CINVESTAV (Ramos Arizpe, Coah, México), Mexico

J. C. Escobedo
CINVESTAV (Ramos Arizpe, Coah, México), Mexico

J. I. Escalante-García
CINVESTAV (Ramos Arizpe, Coah, México), Mexico

Abstract


Environmentally-friendly calcium sulphoaluminate clinkers were obtained from a mixture of aluminium dross, fluorgypsum, fly ash and CaCO₃ at temperatures within the range of 1100 to 1400 °C. After the heat treatments Ca₄Al₆O₁₂SO₄ was the main phase. Three different cements were prepared using the clinkers synthesized at 1250, 1350 and 1400 °C; the clinker powders were mixed with 20 wt% of hemihydrate. Cement pastes were prepared using a water/cement ratio (w/c), 0.4 followed by curing at 20 or 40 °C for periods of time ranging from 1 to 28 days. Most of the samples showed high compression strengths 40–47 MPa after 28 days, which were comparable to the strength of Portland cement. Ettringite was the main hydration product and its morphology consisted of acicular and hexagonal plates, which is typical of this phase.

Keywords


Clinker; Calcium Sulpholuminate; Wastes; Ettringite

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