Accession Number:

AD0412407

Title:

WATER VAPOR TRANSMISSION OF CONCRETE AND OF AGGREGATES

Descriptive Note:

Technical rept.

Corporate Author:

NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA

Personal Author(s):

• Henry, R. L.
• Kurtz, G. W.

Report Date:

1963-06-30

Pagination or Media Count:

78.0

Abstract:

An investigation was made of the effects of water-cement ratio, type of reinforcing steel, aggregate size, relative humidity, concrete slice position, and two admixtures, sodium chloride and oleic acid, on the water vapor transmission of concrete. A collateral investigation was made of the water vapor transmission of aggregates, and a study was made of the growth of sodium chloride whisker crystals on concrete. Water vapor transmission rates were found to decrease with an in crease in strength of concrete decreased water cement ratio, an increase in aggregate size, and the presence of sodium chloride. Rates appeared to decrease with an increase in relative humidity, but the data were inconclusive. The rates were found to be independent of the type of rein forcing steel and the absence or presence of oleic acid. The water vapor transmission rates of aggregates were found to be lower than the water vapor transmission rates of concrete, but were of the same order of magnitude.

Descriptors:

• *WATER
• *CONCRETE
• TRANSPORT PROPERTIES
• CEMENTS
• CHLORIDES
• REINFORCING MATERIALS
• HUMIDITY
• WATER VAPOR
• COMPRESSIVE PROPERTIES
• CARBOXYLIC ACIDS
• SODIUM COMPOUNDS

Subject Categories:

• Construction Equipment, Materials and Supplies
• Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE