Crushed sand in concrete – Effect of particle shape in different fractions and filler properties on rheology

Studies of sand particle characteristics (shape, voids content, filler particle size distribution) and rheology of concrete (slump-flow, yield stress and plastic viscosity) show that the 0.125/2 mm particle shape and ≤0.125 mm filler properties are the most important factors for concrete workability...

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Bibliographic Details
Published inCement & concrete composites Vol. 71; pp. 26 - 41
Main Authors Cepuritis, Rolands, Jacobsen, Stefan, Pedersen, Bård, Mørtsell, Ernst
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.08.2016
Subjects
Concretes
Constants
Crushed sand
Exchange
Filler
Fillers
Grading
Manufactured sand
Particle packing
Particle shape
Rheology
Sand
Particle packing
Crushed sand
Particle shape
Manufactured sand
Rheology
Filler
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Summary:Studies of sand particle characteristics (shape, voids content, filler particle size distribution) and rheology of concrete (slump-flow, yield stress and plastic viscosity) show that the 0.125/2 mm particle shape and ≤0.125 mm filler properties are the most important factors for concrete workability when the sand grading 0/8 mm is kept constant. By normalizing the maximum variation of rheology (slump-flow value in mm) obtained in mixes where different size fractions are exchanged, the fraction ≤ 0.125 mm was found to have around 6–8 times larger effect on rheology per unit volume % exchanged, compared to the coarser sand fractions: ≤0.125 mm = 35.2 mm/%; 0.125/2 mm = 4.9 mm/%; 2/5 mm = 6.0 mm/% and 5/8 mm = 3.8 mm/%.
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ISSN:0958-9465
1873-393X
DOI:10.1016/j.cemconcomp.2016.04.004