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- W2245037316 abstract "A SERIES OF STRUCTURAL-GRADE CONCRETE TEST CYLINDERS WAS CAST AND TESTED IN THE LABORATORY TO DETERMINE THE DECREASE IN COMPRESSIVE STRENGTH TO BE EXPECTED WITH INCREASING LEVELS OF AIR ENTRAINMENT. REGRESSION ANALYSIS OF THESE DATA SHOWS THE DECREASE OF STRENGTH TO BE ABOUT 400 PSI FOR EACH 1 PERCENT INCREASE INCREASE OF AIR ENTRAINMENT WITHIN THE RANGE OF INTEREST BETWEEN 3 AND 10 PERCENT. ADDITIONAL TECHNIQUES ARE APPLIED TO CONSTRUCT A CURVE TO PREDICT PROBABLE REJECTION RATES WITH VARIOUS AIR ENTRAINMENT LEVELS THAT MIGHT BE SPECIFIED IN THE FUTURE. THESE RESULTS, COMBINED WITH ENGINEERING JUDGMENT, LED TO THE ADOPTION OF A NEW AIR SPECIFICATION OF 6.0 PLUS OR MINUS 1.5 PERCENT. OPERATING CHARACTERISTIC CURVES ARE DEVELOPED TO PREDICT PROBABLE REJECTION RATES FOR DIFFERENT LOT SIZES WITH THE NEW SPECIFICATION. A LOGARITHEMIC TRANSFORMATION OF THE DATA IS USED IN A SECOND REGRESSION ANALYSIS TO FURTHER EXPLORE THE FUNDAMENTAL RELATION BETWEEN AIR ENTRAINMENT AND STRENGTH." @default.
- W2245037316 created "2016-06-24" @default.
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- W2245037316 date "1973-01-01" @default.
- W2245037316 modified "2023-09-23" @default.
- W2245037316 title "STATISTICAL ANALYSIS OF CONCRETE STRENGTH VERSUS AIR ENTRAINMENT" @default.
- W2245037316 hasPublicationYear "1973" @default.
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