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Abstract
Air meter tests performed by different operatiors on the same batch of plastic concrete have a 95% probability of being within 0/80% of the mean. Analysis of variance of linear traverse data revealed that this test has good precision, as long as the air content does not exceed 7%; both within-operator and between-operator variances were non-significant below this level of air. When air meter results are compared to the entrained air content of hardened concrete, as determined by the linear traverse test, there is a 95% probability that the maximum variation between the means of the two will not exceed 1.65%. There is esentially no change in the entrained air content between plastic and hardened concrete whether vibrated 3 seconds or 30 seconds. Compressive strength is directly related to the total air content; for each percent increase in total air, the compressive strength decreases about 400 psi.
Air meter tests performed by different operatiors on the same batch of plastic concrete have a 95% probability of being within 0/80% of the mean. Analysis of variance of linear traverse data revealed that this test has good precision, as long as the air content does not exceed 7%; both within-operator and between-operator variances were non-significant below this level of air. When air meter results are compared to the entrained air content of hardened concrete, as determined by the linear traverse test, there is a 95% probability that the maximum variation between the means of the two will not exceed 1.65%. There is esentially no change in the entrained air content between plastic and hardened concrete whether vibrated 3 seconds or 30 seconds. Compressive strength is directly related to the total air content; for each percent increase in total air, the compressive strength decreases about 400 psi.
Date
9/1981
9/1981
Author(s)
Reidenouer, DR; Howe, RH
Reidenouer, DR; Howe, RH
Page(s)
126-
126-
Keyword(s)
air content; concrete; entrained air; entrapped air void; linear traverse analysis; variance analysis
air content; concrete; entrained air; entrapped air void; linear traverse analysis; variance analysis