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- W624966467 abstract "Aggregate characteristics of shape, texture and grading have a significant effect on the performance of concrete. Research has shown that shape, texture and grading influence the packing degree of dry mixtures. At the same time, the packing degree has been found to be a key to proportioning concrete mixtures. Interest in high performance concrete and concrete with high fines has emphasized the importance of improving the aggregate particle distribution. The purpose of this project is to select a mixture proportioning method which accounts for aggregate properties in order to most effectively use aggregate in concrete. As part of this project, five proportioning methods have been evaluated to proportion mixtures with and without microfines. Most of these methods emphasize the best packing of aggregates as a way to obtain optimized concrete. Concrete with two different water-to-cement ratios (0.68 and 0.41) and a target slump of 4 in. was proportioned using nine combinations of four aggregate sources. Two of these aggregates were crushed with high microfines content, while the other two were natural river gravels with less than 3 % microfines. For each aggregate the paste content was kept constant. The general trend for mixtures without admixtures is that the compressive and the flexural strength are about the same, but there are some significant differences in slump as well as in placeability and finishability." @default.
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- W624966467 date "2002-01-01" @default.
- W624966467 modified "2023-09-26" @default.
- W624966467 title "THE EFFECT OF MIXTURE PROPORTIONING ON THE PERFORMANCE OF PORTLAND CEMENT CONCRETE" @default.
- W624966467 hasPublicationYear "2002" @default.
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