Properties of geopolymer binders prepared from milled pond ash

J. Temuujin; A. Minjigmaa; U. Bayarzul; D. S. Kim; S-Ho Lee; H. J. Lee; C. H. Ruescher; K. J.D. MacKenzie

doi:10.3989/mc.2017.07716

Autores/as

J. Temuujin Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences https://orcid.org/0000-0003-0930-7271
A. Minjigmaa Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences https://orcid.org/0000-0002-4468-7874
U. Bayarzul Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences https://orcid.org/0000-0002-3995-3875
D. S. Kim Korea Institute of Ceramic Engineering and Technology https://orcid.org/0000-0003-4722-2738
S-Ho Lee Korea Institute of Ceramic Engineering and Technology https://orcid.org/0000-0001-6208-0155
H. J. Lee Korea Institute of Ceramic Engineering and Technology https://orcid.org/0000-0001-7369-5630
C. H. Ruescher Institute of Mineralogy, Leibniz University of Hannover https://orcid.org/0000-0003-1471-7910
K. J.D. MacKenzie MacDiarmid Institute for Advanced Materials and Nanotechnology, Victoria University of Wellington https://orcid.org/0000-0003-3460-6708

DOI:

https://doi.org/10.3989/mc.2017.07716

Palabras clave:

Cenizas de estanque, Molienda, Cementos activados alcalinamente, Resistencias a compresión, Microstructura

Resumen

Se prepararon materiales activados alcalinamente a partir de cenizas de charca de la central térmica de Darkhan (Mongolia). Esta ceniza contiene alrededor de un 60% en peso de material amorfo además de mullita, hematita, cuarzo y magnesioferrite. Presenta además importantes problemas de almacenamiento ya que se acumula en grandes cantidades y es un desecho peligroso, que contiene entre 90–100 ppm de metales pesados como Pb y Cr, y alrededor de 800 ppm de Sr. Los materiales sintetizados a partir de las cenizas de estanque presentaron resistencias a compresión de tan sólo 3,25 MPa. La reducción del tamaño de partícula por fresado mecánico hasta 30 min aumentó las resistencias mecánicas hasta valores de 15.4 MPa. Las pruebas de lixiviación indican que la combinación de molienda y activación alcalina no causan la liberación de los metales pesados peligrosos del producto, por lo que resulta adecuado para aplicaciones en construcción.

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