Influence of Measurement Technique on the Air-Void Structure of Hardened Concrete. Discussion by Ken Snyder.
Influence of Measurement Technique on the Air-Void
Structure of Hardened Concrete. Discussion by Ken
ACI Materials Journal, Vol. 93, 512-514, 1996.
concretes; air void system; air void spacing; building
The author proposes, and successfully demonstrates, that
the results for air content and specific surface area
(SSA) from an ASTM C 457 linear traverse performed on a
thin section can differ from those performed on a
polished plane section. The difference between thin
section and plane surface air contents was quantified
using a probability theory approach, and
semi-quantiattive arguments were given to explain the
difference for SSA results. However, the tabulated data
suggest further study is needed. The discussion
advances the author's work by addressing a minor error
in the calculation, and by proposing an analytical
approach for estimating the influence of measurement
technique on the measured SSA value.