Accession Number:

AD0256717

Title:

MOISTURE MIGRATION RATES THROUGH BUILDING MATERIALS

Descriptive Note:

Final rept.

Corporate Author:

NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA

Personal Author(s):

Report Date:

1961-05-12

Pagination or Media Count:

39.0

Abstract:

Tests were made to determine moisture migration rates 1 through concrete floors as affected by different types of soil beds and 2 through various wall materials, such as concrete block, common brick, mortar, gypsum, and wood. Wall materials were tested singly and compositely. Thirty concrete floor samples sealed in special holders containing several types of wet soil were placed in a controlled humidity-temperature room. All samples were tested at 60 F FOR DAYS AT , , AND relative humidity. In nearly all instances the rates increased with a decrease in relative humidity. Asphaltic concrete samples had lower rates. Migration rates for admixtures and surface treatments did not significantly change. Sixteen tests at various water-vapor partial-pressure differentials dVPs were made of five individual wall materials, each 2 ft square. Differentials varied from 0.03 to 1.60 in. Hg. Moisture migration rates varied from 0.2 to 37-12 grainshrsq ft, with 8-in. concrete blocks having the lowest rate and 2-12 in. of ortar the highest. Twentyseven tests were made of 9 composite wall samples each 28 ft square. The dVPs varied from 0.25 to 1.00 in. Hg. Moisture migration rates varied from 0.15 to 15 grainshrsq ft. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE