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The structure of alite in Portland cement clinker — TEM evidence

✍ Scribed by K.E. Hudson; G.W. Groves

Publisher
Elsevier Science
Year
1982
Tongue
English
Weight
586 KB
Volume
12
Category
Article
ISSN
0008-8846

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✦ Synopsis

In the examination of alite in Portland cement clinker by transmission electron microscopy, the dominant structure found was that described by Jeffery (I). Twinning on the pseudomirror plane of the monoclinic structure has been found. This provides an explanation for some weak extra X-ray reflections reported by Jeffery (1). A transformation to a new lattice occured when alite was heated in the electron microscope. Microstructural defects and diffraction effects not accounted for by the Jeffery lattice are discussed.

Mit einer Untersuchung mittels Durchstrahlungselektronenmikroscopie wurde es gezeigt, dass die gewohnliche Struktur yon Alite in dem Portland-Zement die yon Jeffery beschriebene (I) Struktur war. Zwillinge auf den Pseudospiegelebenen des monoklinen Kristalles gefunden wurden.

Diese Zwillinge erkl~ren schwache ausserordentliche RSntgenreflexionen, die Jeffery berichtet hatte (i). Als Afire in dem Elektronenmikroscop gew~rmt wurde, wurde eine Gitterumwandlttng beobachtet.

Kristallfehler und Beugungsbilder, die der Gitter yon Jeffery nicht erklMren kann, behandelt werden.

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