Numerical Test of Air Void Spacing Equations.
Numerical Test of Air Void Spacing Equations.
(1953 K)
Snyder, K. A.
Advanced Cement Based Materials, Vol. 8, 28-44, 1998.
Keywords:
air-void system; air-void spacing; building technology;
concretes; entrained air voids; freeze thaw; spacing
equations
Abstract:
Air void spacing equations have been proposed in the
literature by a number of authors: Powers; Philleo;
Attiogbe; and Pleau and Pigeon. Each proposed spacing
equation attempts to characterize the true "spacing" of
entrained air voids in concrete. While efforts have
been made to correlate these spacing equation
calculations to freeze-thaw performance, no test has
been performed to assess the geometrical accuracy of
these spacing equations. Herein is a computerized
accuracy test of these proposed spacing equations. A
computer model of air void systems is used, and various
"spacings" are measured in the model system. The
results of these measurements are then compared to the
appropriate spacing equation prediction, along with
equations developed by Lu and Torquato.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899