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Residual fly ash from pyrometallurgical processes as a partial replacement for Portland cement in mortars: a study of structural evolution and determination of compressive strength

Juarez-Tapia J. C., García-Ortiz H., Pérez-Labra M., Romero-Serrano J. A., Reyes-Pérez M., Hernández-Ramirez A., Acosta-Sanchez V., Teja-Ruiz A. M., Reyes-Dominguez I.A.

Materials Science Poland

2023

Vol. 41, No. 4

120--131

Mortar mixtures were prepared by partial replacement of Portland cement with 0%, 10%, and 15% of residual fly ash to determine the structural evolution and compressive strength at 3, 7, 14, and 28 days. Portlandite, calcite, ettringite, iron oxide, silicon oxide, and sillimanite were identified in the standard mortar, and, additionally, magnetite was identified in the mortar with 10% and 15% fly ash. X-ray diffraction peaks corresponding to portlandite and ettringite increased in intensity with increasing curing time as a result of the consolidation of mineral species. The SEM analysis revealed that the standard mortar contained mainly portlandite and ettringite at 28 days, while the samples with 10% and 15% fly ash contained particles of fly ash coated with portlandite and ettringite, particles with a smooth surface, and particles of fly ash with signs of attack on their surfaces. The sc increased when the age of the mortar and the substitution of Portland cement by fly ash was increased from 3 to 28 days and from 0 to 15%, respectively.

Post-metamorphic structural evolution of a Variscan basement high in the Pannonian Basin, SE Hungary

Molnar L, Toth T M, Schubert F.

Geologia Sudetica

2014

Vol. 42

61--63

Wybrane problemy tektoniki i mineralizacji skał dewonu w zachodniej części antykliny chęcińskiej : Góra Miedzianka, Góry Świętokrzyskie

Dębowska U.

Przegląd Geologiczny

2004

Vol. 52, nr 9

920--926

The problems of relationships between the tectonics and the copper and calcite mineralization in the western part of the Chęciny Antycline (Miedzianka Mt.) are discussed. Variscan fold deformation and Alpine fault tectonic cycles characterize Miedzianka Mt. side. The Chęciny Anticline became an inclined fold due to Variscan deformations. Very complicated joints relationship is a result of many stages of their tectonic evolution. Slickesides and joints analysis revealed three groups of faults ( Variscan, early Alpine and late Alpine). Calcite, azurite and malachite mineralizations formed due to the early stage of post-Variscan mineralization (so-called "Różanka" type). Faults formed during the Alpine cycles mainly along calcite zones.

Structural evolution of the Magura Nappe (Polish Outer Carpathians) in the light of the studies of joints

Zuchiewicz W.

Biuletyn Państwowego Instytutu Geologicznego

2001

nr 396

171-172