Microstructure, composition and crystallography of Aalbrog Lion Brand Danish White cement
By: Fernando Maldonaldo
Contributors: Naval Postgraduate School (U.S.) 
Publisher: Naval Postgraduate School; Available from National Technical Information Service
Published: 1997
Place of publication: Monterey, Calif; Springfield, Va
Language: eng
Number of pages: 73
Description: The morphology and crystallography of fully hardened Aalbrog Lion Brand Danish White cement paste (water      cement ratio 0.25) were examined using x- ray diffraction, optical and scanning electron microscopy with energy      dispersive x-ray analysis (EDX) and transmission electron microscopy and EDX. These experiments showed      the hardened cement to be mostly comprised of equiaxed particles of 3CaO.SiO2 with diameter of the order of      10 microns and larger often surrounded by inner and outer regions of an amorphous gel-like matrix with an      average composition of about 1.75CaO.SiO2.3H2O (C-S-H) in which the CaO/SiO2 ratio varied from about      0.3 to 5.74. The hydrated regions were also found to contain significant amounts of Ca(OH)2. Small amounts of      ettringite (Ca6Al2(SO4, SiO4,CO3)3 (OH)12.26H2O) were also detected. In addition, selected area electron      diffraction of the C-S-H matrix revealed diffuse rings, indicating the presence of short range ordering. The      morphology of C-S-H matrix was found to be comprised of small 'cells' of size approximately 5 nm which are      no doubt responsible for the good mechanical properties of this particular hardened cement paste. These results      were also found to be in excellent agreement with previous research on this topic.
Notes: "September 1997."

Thesis advisor(s): Alan G. Fox.

Thesis (M.S. in Mechanical Engineering) Naval Postgraduate School, September 1997.

Includes bibliogrpical references (p. 69-71)

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US Navy (USN) author.

dk/dk cc:9116 04/29/98.