- Author
-
Snyder, K. A.
- Title
- Discussion of "The Use of the Flow Length Concept to Assess the Efficiency of Air Entrainment With Regards to Frost Durability: Part 1. Description of the Test Method" by R. Pleau and M. Pigeon.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
- Journal
-
Cement, Concrete, and Aggregates,
Vol. 19,
No. 2,
116-119,
December 1997
- Keywords
-
air entrainment
|
frost durability
|
flow length concept
|
building technology
|
concretes
|
air-void system
|
air-void spacing
- Abstract
- In an approach similar to that of Philleo, the authors have attempted to calculate the distribution of distances between random points in the paste and the nearest air void surface (paste-void proximity distribution). This approach has a distinct advantage over single parameter spacing equations that cannot characterize a distribution of spacings. However, like the Philleo equation, the authors' equation for the paste-void proximity distribution is an approximation, and is only exact for zero air content. This dicussion will demonstrate this point calculsively for monodispersed spheres. Additionally, by comparing results of a similar numerical experiment published previously to predictions based upon the authors'equation, it can be demonstrated that the authros' equation contains considerable error at concrete air content of 5% for a zeroth-order logarithmic distribution of sphere diameters.