The author would like to thank his many colleagues in the Building Materials
Division at NIST who have contributed to this research, especially Dr.
Edward Garboczi, who was instrumental in the early stages of the model
development and the application of percolation theory to these materials.
He would also like to thank V. Waller and F. de Larrard of Laboratoire Central
des Ponts et Chaussees, France for providing the experimental adiabatic heat
signature data used in Figures 6 to 8 and Paul
Stutzman of NIST for obtaining the real SEM images presented in Figure
10.