Accession Number:

AD0257789

Title:

WATER VAPOR TRANSMISSION OF PLAIN CONCRETE

Descriptive Note:

Corporate Author:

NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA

Personal Author(s):

Report Date:

1961-05-16

Pagination or Media Count:

55.0

Abstract:

Studies were conducted to measure water vapor permeability of concrete and relate it to corrosion of embedded steel to investigate salt whisker crystal growth on concrete and to measure electrical resistivity of concrete. The effects of water-cement ratio, relative humidity, aggregate size, concrete slice position, and certain admixtures such as oleic acid and NaCl on the permeability of plain concrete were investigated. Salt whisker crystal growth on specimens with NaCl as an admixture is discussed. Water vapor transmission valu s were found to be significantly higher for higher water- cement ratios, smaller aggregate, and the absence of NaCl. Concrete slice position, oleic acid, and relative humidity were found to have no significant effect. The study demonstrates that water vapor transmission is not directly proportional to water vapor pressure differentials between the ends of the flow path.

Subject Categories:

  • Construction Equipment, Materials and Supplies

Distribution Statement:

APPROVED FOR PUBLIC RELEASE