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Importance of aggregate packing density on workability of self-consolidating concrete
The influence of packing density of fine particles an workability of self-consolidating concrete was investigated. Two aggregate combinations were evaluated. The first was slightly discontinuously graded aggregate containing 0-4 mm sand and 7-16 mm coarse aggregate with a near-optimum packing density of 0.80. The second one was continuously-graded with 0-2, 3-6, and 7-16 mm aggregate combinations with slightly lower packing density of 0.72 to 0.75. In total, 32 mixtures proportioned with 420, 480, and 550 kg/m3 of cement and limestone filler were investigated. The mixtures had water to powder ratios of 0.33, 0.40, and 0.50, and had initial slump flow consistencies of 650 and 720 +- 20 mm. Concrete with the near-optimum higher packing density had lower demand for high-range water reducer and developed lower viscosity, especially for mixture with low water/binder ratio. All mixtures had adequate filling capacity; concrete made with the near-optimum higher packing density exhibiting slightly better results. Higher resistance to surface settlement was obtained with the concrete containing higher fine content (< 80 micrometer).
Importance of aggregate packing density on workability of self-consolidating concrete
The influence of packing density of fine particles an workability of self-consolidating concrete was investigated. Two aggregate combinations were evaluated. The first was slightly discontinuously graded aggregate containing 0-4 mm sand and 7-16 mm coarse aggregate with a near-optimum packing density of 0.80. The second one was continuously-graded with 0-2, 3-6, and 7-16 mm aggregate combinations with slightly lower packing density of 0.72 to 0.75. In total, 32 mixtures proportioned with 420, 480, and 550 kg/m3 of cement and limestone filler were investigated. The mixtures had water to powder ratios of 0.33, 0.40, and 0.50, and had initial slump flow consistencies of 650 and 720 +- 20 mm. Concrete with the near-optimum higher packing density had lower demand for high-range water reducer and developed lower viscosity, especially for mixture with low water/binder ratio. All mixtures had adequate filling capacity; concrete made with the near-optimum higher packing density exhibiting slightly better results. Higher resistance to surface settlement was obtained with the concrete containing higher fine content (< 80 micrometer).
Importance of aggregate packing density on workability of self-consolidating concrete
Khayat, K.H. (author) / Hu, C. (author) / Laye, J.M. (author)
2002
8 Seiten, 3 Bilder, 3 Tabellen, 6 Quellen
Conference paper
English
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