WATER VAPOR TRANSMISSION OF CONCRETE AND OF AGGREGATES
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA
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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.
- Construction Equipment, Materials and Supplies
- Laminates and Composite Materials