F186916a Calcium
Chloride Concrete Vapor Test Formula
For Use with
Vaprecision Calcium Chloride Concrete Moisture Vapor
Test Kits
ASTM F186916a calls for the
area to be in square feet. There is 144 square inches in 1
square foot.
Area (sq/ft) = ( 70  5.94 ) / 144 = 0.44486 square feet
ASTM Example:
Calculating the results using a 3.0 gram gain over 72 hours.
MVER = 24,000 X Gain / 453.612 X Area X Time
MVER = 24,000 X 3.0 / 453.612 X 0.44486 X 72
MVER = 72,000 / 14,529.155
MVER =
4.95 pounds
The original formula was simplified and did not deduct the area of
the dish under the dome ( 70 / 144 = 0.486 ):
MVER = 24,000 X Gain / 453.612 X Area X Time
MVER = 24,000 X 3.0 / 453.612 X 0.486 X 72
MVER = 72,000 / 15,872.79
MVER = 4.54 pounds
The simplified calculation that
yields ASTM:
Taking the 24,000 and dividing by the 201.7956, we arrive at a
figure of 118.932 as the constant. Using the same Gain and
Time examples as before:
MVER = 118.932 X Gain / Time
MVER = 118.932 X 3.0 / 72
MVER =
4.9555 pounds
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