CEMHYD3D: A Three-Dimensional Cement Hydration and Microstructure Development Modelling Package. Version 2.0.
CEMHYD3D: A Three-Dimensional Cement Hydration and
Microstructure Development Modelling Package. Version
Bentz, D. P.
NISTIR 6485; 241 p. April 2000.
Available from: National Technical Information Service
(NTIS), Technology Administration, U.S. Department of
Commerce, Springfield, VA 22161.
1-800-553-6847 or 703-605-6000;
Fax: 703-605-6900; Rush
Service (Telephone Orders Only) 800-553-6847;
Order number: PB2002-107987
cements; cement hydration; compressive strength;
computer models; correlation; heat of hydration; image
processing; microstructure; simulation; computer
This user's manual provides updated documentation and
computer program listings for version 2.0 of the
three-dimensional cement hydration and microstructure
development model (CEMHYD3D) developed at the National
Institute of Standards and Technology. Originally
documented and distributed in 1997, several substantial
enhancements and modifications have been included in the
new release. The following topics are covered in this
documentation, as they were in the original version:
acquisition and processing of two-dimensional scanning
electron microscope and x-ray images; creation of a
starting three-dimensional microstructure based on a
measured particle size distribution for the cement
powder and information extracted from the
two-dimensional composite image; and execution of the
cement hydration and microstructure development program.
Additional noteworthy features of the new version of the
model include: direct modelling of the induction period
during cement hydration; isothermal, adiabatic, or
user-programmed temperature curing conditions; a calcium
silicate hydrate gel (C-S-H) whose molar stoichiometry
and specific gravity (molar volume) vary with
temperature; improved pozzolanic reactions between
cement and silica fume (fly ash); and the incorporation
of various forms of calcium sulfate (dihydrate,
hemihydrate, and anhydrite) into the hydration model. In
addition, a prototype internet-accessible database
containing two-dimensional composite SEM images,
quantitative phase analysis results, and measured cement
particle size distributions is now available to provide
key input information for the three-dimensional
modelling process. Documented example datafiles are
provided along with the examples given in the guide.
Complete program listings are provided in the
appendices. This manual and all of the computer programs
it describes are freely available for downloading via
anonymous ftp from NIST.