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

Materiales de Construccion. 2014;64(315):e023

 

Journal Homepage

Journal Title: Materiales de Construccion

ISSN: 0465-2746 (Print); 1988-3226 (Online)

Publisher: Consejo Superior de Investigaciones Científicas

LCC Subject Category: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials

Country of publisher: Spain

Language of fulltext: Spanish; Castilian, English

Full-text formats available: PDF, HTML, XML

 

AUTHORS

Gallardo, M. (CINVESTAV (Ramos Arizpe, Coah, México). Mexico)
Almanza, J. M. (CINVESTAV (Ramos Arizpe, Coah, México). Mexico)
Cortés, D. A. (CINVESTAV (Ramos Arizpe, Coah, México). Mexico)
Escobedo, J. C. (CINVESTAV (Ramos Arizpe, Coah, México). Mexico)
Escalante-García, J. I. (CINVESTAV (Ramos Arizpe, Coah, México). Mexico)

EDITORIAL INFORMATION

Double blind peer review

Editorial Board

Instructions for authors

Time From Submission to Publication: 48 weeks

 

Abstract | Full Text

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.<br><br>Se fabricaron clinkers de bajo impacto ambiental a base de sulfoaluminato de calcio calcinando mezclas de escoria de aluminio, fluoryeso, ceniza volante y CaCO₃ a diferentes temperaturas dentro de un rango de 1100 a 1400 °C. Se observó la formación de Ca₄Al₆O₁₂SO₄ como fase principal. Para obtener los cementos, los clinkers obtenidos a 1250, 1350 y 1400 °C se mezclaron con 20% en peso de hemihidrato. Se prepararon pastas usando una relación agua/cemento, de 0.4 y se curaron a 20 y 40 °C por diferentes periodos de tiempo desde 1 hasta 28 días. Los valores de resistencia a la compresión a los 28 días de curado de la mayoría de las muestras estuvieron entre 40–47 MPa, equiparables a los de referencia de pastas de cemento Portland. La etringita fue el principal producto de hidratación y su morfología consistió de placas hexagonales y aciculares, típicas de esta fase.