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Quantification of the shape of particles for calculating specific surface area of powders
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0003-2567-5891
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0002-3997-3083
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering.ORCID iD: 0000-0001-6287-2240
Number of Authors: 3
2016 (English)In: RILEM publication S.A.R.L, Denmark, 2016, Vol. 115, p. 31-41Conference paper, Published paper (Refereed)
Abstract [en]

The concepts of particle packing and water/paste layer theory are commonly used for basis of concrete mix design models. While particle packing insists on achieving fewer voids in aggregate matrix by adding fine aggregate, water/paste layer theories state that increasing the amount of fines will lead to higher water demand since the specific surface area of particles will increase. In order to calculate the thickness of excess paste, it is essential to quantify the shape of particles. However, there are uncertainties regarding how the various shape parameters would affect the packing and specific surface, mainly because up to now many of the shape parameters are not yet clearly defined and there are no commonly accepted methods for their measurement. In addition, the term “shape” needs to be defined, some research suggest that for obtaining an appropriate shape factor several parameters need to be measured e.g. flakiness, elongation, sphericity, convexity etc. The paper aims to derive a shape factor based on variation of packing from the packing of ideal spheres with the same particle size distribution as the studied aggregate and to apply the shape factor to calculate an approximate specific surface area value.

Place, publisher, year, edition, pages
Denmark, 2016. Vol. 115, p. 31-41
Keyword [en]
water layer theory, specific surface area, Mix Design, Civil engineering and architecture - Building engineering
Keyword [sv]
Samhällsbyggnadsteknik och arkitektur - Byggnadsteknik
National Category
Infrastructure Engineering
Research subject
Structural Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-32563Local ID: 71926a3d-8d0e-417c-86e4-8a3054cbda1fISBN: 978-2-35158-184-1 (print)ISBN: 978-2-35158-185-8 (electronic)OAI: oai:DiVA.org:ltu-32563DiVA, id: diva2:1005797
Conference
MSSCE2016 : RILEM 22/08/2016
Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-04-03Bibliographically approved
In thesis
1. Aggregates in Concrete Mix Design
Open this publication in new window or tab >>Aggregates in Concrete Mix Design
2017 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The importance of studying the behaviour and properties of concrete can be highlighted by considering the fact that concrete is the most used man-made material in the world. The very first step in making concrete is its mix design and deciding the type and amount of constitutes used in the production of concrete which should fulfil the requirements of the final product. Mix design models are commonly used for the purpose of proportioning concrete ingredients while anticipating the properties of the final product. 

The current document deals with the commonly used principals in mix design models namely particle packing theory and excess water/paste layer theories. The conducted studies includes an investigation on accuracy of particle packing models (Toufar, 4C, CPM) and also tries to address the issue with measurement of specific surface area of particles as an essential input to water/paste layer theories. 

It has been observed that the particle packing models can predict the packing density with acceptable margin. However, it should be mentioned that the particle packing models by themselves are not mix design models but should be rather used as a part of a mix design. In addition, it was found that the accuracy of calculating the specific surface area of particles based on their size distribution curve can be further improved by assuming angular platonic solids as uniform shape of aggregate instead of traditional approach of assuming spheres for aggregates’ shape. 

Place, publisher, year, edition, pages
LTU: Luleå University of Technology, 2017. p. 60
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
Keyword
Mix design, water layer theory, particle packing, aggregates, specific surface area
National Category
Building Technologies
Research subject
Construction Engineering and Management
Identifiers
urn:nbn:se:ltu:diva-61659 (URN)978-91-7583-800-7 (ISBN)978-91-7583-801-4 (ISBN)
Presentation
2017-03-28, F1031, Lulea, 13:00 (English)
Opponent
Supervisors
Available from: 2017-01-30 Created: 2017-01-26 Last updated: 2018-04-03Bibliographically approved

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