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Composition and Morphology of Hydrated Tricalcium Silicate
Author(s) -
GOTO SEISHI,
DAIMON MASAKI,
HOSAKA GIRO,
KONDO RENICHI
Publication year - 1976
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.1151-2916.1976.tb10965.x
Subject(s) - scanning electron microscope , acicular , electron microprobe , morphology (biology) , silicate , chemical composition , texture (cosmology) , microanalysis , chemistry , alcohol , composition (language) , mineralogy , analytical chemistry (journal) , materials science , chemical engineering , crystallography , chromatography , composite material , organic chemistry , microstructure , geology , paleontology , engineering , linguistics , image (mathematics) , philosophy , artificial intelligence , computer science
Hardened C 3 S paste cured for 1 year at 20°C was examined to confirm the composition and the morphology of hydrated tricalcium silicate. A new technique was used in which the samples for scanning electron microscopy (SEM) and electron probe microanalysis (EPMA) were etched in 1% HNO 3 ‐alcohol or in glycerol‐alcohol (4:6 by volume). After the surface was etched in 1% HNO 3 ‐alcohol, SEM clearly showed the difference in texture in the outer and inner C‐S‐H products. The existence of a zonal texture within the inner C‐S‐H products was shown, in addition to the unreacted core; particles 0.1 to 0.2 μm in diameter were observed. After free CH extraction with glycerol‐alcohol, two new types of C‐S‐H grains could be identified. One type has a smooth surface, which seems to be produced from C 3 S grains trapped within the growing CH crystals in the early stage of hydration, the C/S mol ratio for these being >3. The other type is covered with many acicular outer C‐S‐H gel hydration products and has a C/S mol ratio >3.