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Shape-dependent cal...
Shape-dependent calculation of specific surface area of aggregates versus X-ray microtomography
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- Ghasemi, Yahya, 1982- (författare)
- Luleå tekniska universitet,Byggkonstruktion och brand,Department of Civil, Environmental and Natural Resources Engineering, Luleå Technical University, Luleå, Sweden
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- Rajczakowska, Magdalena (författare)
- Luleå tekniska universitet,Byggkonstruktion och brand,Department of Civil, Environmental and Natural Resources Engineering, Luleå Technical University, Luleå, Sweden | Faculty of Civil Engineering, Wroclaw University of Science and Technology, Wroclaw, Poland
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- Emborg, Mats (författare)
- Luleå tekniska universitet,Byggkonstruktion och brand,Department of Civil, Environmental and Natural Resources Engineering, Luleå Technical University, Luleå, Sweden | RandD Betongindustri AB, Stockholm, Sweden
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- Cwirzen, Andrzej (författare)
- Luleå tekniska universitet,Byggkonstruktion och brand,Department of Civil, Environmental and Natural Resources Engineering, Luleå Technical University, Luleå, Sweden
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(creator_code:org_t)
- London : Institution of Civil Engineers (ICE), 2020
- 2020
- Engelska.
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Ingår i: Magazine of Concrete Research. - London : Institution of Civil Engineers (ICE). - 0024-9831 .- 1751-763X. ; 72:2, s. 88-96
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- The specific surface area (SSA) of constituents in a concrete mixture has a significant effect on its workability in fresh state. Excess layer theories relate the SSA to the flow behaviour of mixtures and can be used as part of an approach to mix design. However, measurement of SSA is complex and includes several issues, and thus is commonly replaced by mathematical estimation of the parameter. The mathematical approximation of surface area is based on the assumption of a spherical shape for the particles, which leads to failure of taking into account the effect of shape and the square–cube law. The article explores the possibility of replacing the assumption of a spherical shape with that of Platonic solids as the representative shape to account for the angularity of aggregates. The calculation was conducted based on information on the particle size distribution (PSD) obtained from dry sieving method. A calculated surface area on the assumption of a dodecahedron shape for natural aggregates and a cubical shape for crushed aggregates showed good agreement with SSA measurements conducted by X-ray microtomography. Furthermore, the effect of changes in PSD on the accuracy of the approach was also studied. It was found that the estimated value of SSA was improved in comparison with the traditional way of calculation on the assumption of a spherical shape.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Samhällsbyggnadsteknik -- Infrastrukturteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Civil Engineering -- Infrastructure Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Annan materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Other Materials Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Samhällsbyggnadsteknik -- Husbyggnad (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Civil Engineering -- Building Technologies (hsv//eng)
Nyckelord
- Mix design
- Water film thickness
- Excess water layer theory
- specific surface area
- aggregates
- testing
- apparatus & methods
- workability
- Byggmaterial
- Building Materials
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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