A composite cement of high magnesium sulphate resistance

A. Allahverdi; M. Akhondi; M. Mahinroosta

doi:10.3989/mc.2018.11316

Autores/as

A. Allahverdi Research laboratory of Inorganic Chemical Process Technologies, School of Chemical Engineering, Iran University of Science and Technology - Cement Research Center, Iran University of Science and Technology https://orcid.org/0000-0002-8988-9226
M. Akhondi Research laboratory of Inorganic Chemical Process Technologies, School of Chemical Engineering, Iran University of Science and Technology https://orcid.org/0000-0001-6723-6024
M. Mahinroosta Research laboratory of Inorganic Chemical Process Technologies, School of Chemical Engineering, Iran University of Science and Technology https://orcid.org/0000-0001-9709-2949

DOI:

https://doi.org/10.3989/mc.2018.11316

Palabras clave:

Composite, Cemento con adiciones, Cementos resistentes a los sulfatos, Ataque por sulfatos, Resistencia a la compresión

Resumen

Este trabajo aborda el estudio de la resistencia al sulfato de magnesio de un cemento compuesto con base de escoria de fósforo activada químicamente (CAPSCC). Se prepararon muestras de mortero a partir de escoria de fósforo (80% en peso), cemento Portland tipo II (14% en peso) y activador químico (6% en peso) y tras el curado, se expusieron a una solución de sulfato de magnesio al 5%. También se prepararon morteros de cementos Portland de tipo II y V (PC2 y PC5) que se usaron con fines comparativos. De acuerdo a los resultados obtenidos, después de 12 meses de exposición, PC2, PC5 y CAPSCC mostraron un 43.5, 35.2 y 25.2% de reducción en la resistencia a la compresión, 0.136, 0.110, y 0.026% de expansión en longitud, y 0.91, 2.2 y 1.78% de cambio en peso, respectivamente. Estudios complementarios por difracción de rayos X y microscopía electrónica de barrido revelaron que los cementos CAPSCC tienen un potencial muy bajo para la formación de productos de ataque de sulfato, especialmente etringita. Los resultados confirman una alta resistencia al sulfato de magnesio para CAPSCC en comparación con PC2 y PC5

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