- Author
-
Snyder, K. A.
|
Clifton, J. R.
- Title
- Measures of Air Void Spacing.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
- Book or Conf
- International Conference on Building Materials. Proceedings. September 22-24, 1994,
Weimar, Germany,
155-157 p.,
1994
- Keywords
-
building technology
|
air void systems
|
Attiogbe spacing factor
|
concretes
|
freeze-thaw
|
Philleo spacing factor
|
Powers spacing factor
- Abstract
- Currently in the United States, the standard measure by which to characterize the air void system in hardened concrete is the Powers spacing factor. This parameter attempts to estimate the maximum distance water can travel to reach the nearest air-void before freeze-thaw damage occurs. However, there has been no definitive means to ascertain the accuracy of the spacing factor prediction of any statistical property of the distance water must travel to reach the nearest air void. A computer porgram was written which randomly places non-overlapping spheres, representing air voids, in a cubic cell of cement paste. Points in the paste are chosen at random and the distance to the nearest air void surface is tabulated for each point. Additionally, spheres are chosen at random and the mimimum distance to the nearest neighbor air void surface is tabulated. Various statistical properties of these spacing distribution functions are compared to the spacing factors of Powers, Philleo, and Attiogbe.