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Changes to the Triaxial Composition of the Hydrated Phases ( CaO/Al 2 O 3 /SiO 2 ) in the Metakaolin/Lime System
Author(s) -
García Giménez Rosario,
Rodríguez Olga,
Vigil de la Villa Raquel,
Frías Moisés
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2011.05040.x
Subject(s) - metakaolin , lime , pozzolanic reaction , curing (chemistry) , chemical engineering , calcium oxide , cementitious , silicate , materials science , mineralogy , magnesium , calcination , scanning electron microscope , chemical composition , calcium silicate , chemistry , cement , portland cement , pozzolan , composite material , metallurgy , organic chemistry , engineering , catalysis
This study examines the composition of certain hydrates (calcium silicate, aluminum silicate, and related phases) produced by the pozzolanic reaction of waste‐paper sludge that had previously been activated at different temperatures. It summarizes and compares the evolution of the oxide compounds, and records their stability intervals. Changes to their mineralogical composition were analyzed using X‐Ray Diffraction, scanning electron microscopy, and energy dispersive X‐ray spectroscopy. The hydration products from 1 to 360 days of curing time were CSH gels, hydrotalcite‐type compounds ( LDH ), and stratlingite ( C 2 ASH 8 ). CSH gels were employed as substrates for growing other materials and their morphologies were modified from fibrous to hexagonal layers. The composition of the LDH ‐type compounds observed in the carbonate group varied with changes in curing time. Two LDH ‐type compound types were identified: (a) with and (b) without magnesium. Stratlingite was the only stable material after long‐curing times.