MOISTURE MIGRATION RATES THROUGH BUILDING MATERIALS
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 (dVP's) 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 37-1/2 grains/hr/sq ft, with 8-in. concrete blocks having the lowest rate and 2-1/2 in. of ortar the highest. Twentyseven tests were made of 9 composite wall samples each 28 ft square. The dVP's varied from 0.25 to 1.00 in. Hg. Moisture migration rates varied from 0.15 to 15 grains/hr/sq ft. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 12, 1961
- Accession Number
- AD0256717
Entities
People
- R.j. Zablodil
Organizations
- Naval Facilities Engineering Service Center