- Author
- Snyder, K. A.
- Title
- Estimating the 95th Percentile of the Paste-Void Spacing Distribution in Hardened Cement Paste Containing Air Entrainment.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
- Book or Conf
- RILEM Workshop on Frost Dmage in Concrete (PRO 25). Proceedings. June 28-30, 1999, Minneapolis, MN, 75-85 p., 1999
- Keywords
- cements | air entrainment | cement paste | air-void spacing | air-void system | freeze-thaw | spacing equations
- Abstract
- The spacing equations of Powers, Philleo, and Pleau and Pigeon are used to estimate the uniform thickness of paste surrounding entrained air voids that is required to encompass 95% of the air-paste system. Spacing equation accuracy is determined by comparison to the numerically exact result of Lu and Torquato. The air void system is approximated by spheres with radii from a lognormal distribution. For the systems studied here, both the Philleo and the Pleau and Pigeon equations are accurate to within approximately 10%. The Powers spacing factor can be used to estimate the same quantity to within a factor of two, and could be made far more accurate by adjusting the result using the variance in the air void radius distribution.