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# F1869-16a Calcium Chloride Concrete Vapor Test Formula

## For Use with Vaprecision Calcium Chloride Concrete Moisture Vapor Test Kits

ASTM F1869-16a 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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