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- W575323317 abstract "The primary objective of this study was to initially quantify the effect of changes in total aggregate gradation on concrete performance. The effect of total gradation was studied by monitoring for different mixes: ease of placement; unit weight of fresh PCC; change in w/c at constant slump; change in slump for constant w/c ratio; compressive strength; shrinkage; and possible segregation under vibration. These effects were assessed for bridge deck mix and pavement mix by field and laboratory investigation. Briefly, it was found that optimized gradations can result in the following: modest increases in compressive strength (10 to 20%); air content can be achieved with reduced amounts of air entraining agent (20 to 30%); potentially reduced water demand (up to 15%) as indicated by field results; potentially higher spacing factors in the air void system of hardened concrete; and reduced segregation and higher density surfaces following extended vibration (from 1 to 3 minutes). Some mixed findings and uncertainty continue to cloud the picture, however. Further testing is needed to confirm the trends observed and to establish the effect of gradation optimization on concrete freeze-thaw durability." @default.
- W575323317 created "2016-06-24" @default.
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- W575323317 date "1993-07-01" @default.
- W575323317 modified "2023-09-27" @default.
- W575323317 title "PILOT STUDY ON THE EFFECT OF CHANGES IN TOTAL AGGREGATE GRADATION ON PORTLAND CEMENT CONCRETE PERFORMANCE. FINAL REPORT" @default.
- W575323317 hasPublicationYear "1993" @default.
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