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NISTIR 5977

Guide to Using CEMHYD3D: A Three-Dimensional Cement Hydration and Microstructure Development Modelling Package

D.P. Bentz

ABSTRACT

This user's manual provides documentation and computer program listings for the three-dimensional cement hydration and microstructure development model developed at the National Institute of Standards and Technology. The following topics are covered in this documentation: 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 image; and execution of the cement hydration and microstructure development program. Complete program listings and example datafiles are provided in the appendices of this documentation and the software is also available for downloading via anonymous ftp.

Keywords: Building technology, cement hydration, computer modelling, heat of hydration, image processing, microstructure, percolation, simulation.

• Contents
• List of Figures
• List of Tables
• Introduction
• Two-dimensional Imaging of Cement Particles
  • Scanning electron microscopy image acquisition
  • Image segmentation and median filtering
  • Measurement of autocorrelation functions
• Two-dimensional to Three-dimensional Conversion
  • Generation of spherical particles following measured PSD
  • Filtering of random noise particle image
  • Correction of hydraulic radius
• Three-dimensional Cement Hydration Model
  • Inputs
  • Model execution
  • Outputs
• Example Applications
  • Set Point- Percolation of Solids
  • Percolation Threshold of Capillary Pore Space
  • Prediction of Adiabatic Heat Signature
• Acknowledgements
• References
• Computer programs for two-dimensional imaging
  • Listing for statsimp.c
  • Listing for corrcalc.c
  • Listing for corrxy2r.c
• Computer programs for two-dimensional to three-dimensional conversion
  • Listing for genpart3d.c
  • Listing for rand3d.f
  • Listing for stat3d.c
  • Listing for sinter3d.c
• Computer programs for three-dimensional cement hydration model
  • Code for assessing percolation of pore space
  • Code for assessing percolation of total solids- set point
  • Code for random number generation
  • Listing for hydreal3d.c
  • Listing for disreal3d.c
• Example input datafiles for program execution
  • Example input datafile for use with hydration model
  • Example input datafile for assessing percolation of solids
  • Example input datafile for assessing percolation of pore space
• About this document ...

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