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Aggregates in Concrete Mix Design
Luleå University of Technology, Luleå, Sweden.ORCID iD: 0000-0003-2567-5891
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
Luleå: Luleå University of Technology, 2017. , p. 60
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
Keywords [en]
Mix design, water layer theory, particle packing, aggregates, specific surface area
National Category
Building Technologies
Identifiers
URN: urn:nbn:se:hh:diva-44479ISBN: 978-91-7583-800-7 (print)ISBN: 978-91-7583-801-4 (electronic)OAI: oai:DiVA.org:hh-44479DiVA, id: diva2:1558162
Presentation
2017-03-28, F1031, Luleå University of Technology, Luleå, 13:00 (English)
Opponent
Supervisors
Available from: 2021-08-17 Created: 2021-05-28 Last updated: 2021-08-17Bibliographically approved
List of papers
1. Particle packing of aggregates for concrete mix design: Models and methods
Open this publication in new window or tab >>Particle packing of aggregates for concrete mix design: Models and methods
2014 (English)In: Nordic Concrete Research, ISSN 0800-6377, no 50, p. 109-112Article in journal (Refereed) Published
Abstract [en]

An optimized aggregate particle packing density used as a base for concrete mix design provides economic, environmental and technical advantages. The particle packing density can be determined by many methods and predicted by different models. This paper reviews common packing and procedures and compares predictions of three common packing models to each other. It was found that the models tend to show different packing densities and percentage of ingredients for the same mixture. A test setup is proposed to determine the accuracy of each model’s prediction

Place, publisher, year, edition, pages
Oslo: Nordic Concrete Federation, 2014
Keywords
Aggregates, Loose Packing, Mix Design, CPM, 4C, Modified Toufar
National Category
Building Technologies
Identifiers
urn:nbn:se:hh:diva-44478 (URN)
Note

Available in Licentiate thesis: "Aggregates in Concrete Mix Design"

Available from: 2021-05-28 Created: 2021-05-28 Last updated: 2021-08-16Bibliographically approved
2. Particle Packing for Concrete Mix Design: Models vs. Reality
Open this publication in new window or tab >>Particle Packing for Concrete Mix Design: Models vs. Reality
2014 (English)In: Nordic Concrete Research, ISSN 0800-6377, Vol. 51, p. 85-94Article in journal (Refereed) Published
Abstract [en]

The packing density of aggregates is of great importance in concrete mix design as obtaining a higher packing density leads to less usage of cement paste which has technical, environmental and economic benefits. It is thus of interest to model particle packing correctly. Hence, in this study, packing densities of seven mixes of aggregate were attained in the laboratory using the loose packing method and were compared to values suggested by three models: 4C, Compressible Packing Model and Modified Toufar Model. Modified Toufar showed 1.72% mean difference from the laboratory values while CPM and 4C had mean differences of 1.79% and 1.84% respectively. In addition, it was found that some of the models are preferable in certain mixtures.

Place, publisher, year, edition, pages
Oslo: Nordic Concrete Federation, 2014
Keywords
Materials science - Construction materials, Civil engineering and architecture - Building engineering
National Category
Building Technologies
Identifiers
urn:nbn:se:hh:diva-44477 (URN)
Available from: 2021-05-28 Created: 2021-05-28 Last updated: 2021-08-17Bibliographically approved
3. Quantification of the shape of particles for calculating specific surface area of powders
Open this publication in new window or tab >>Quantification of the shape of particles for calculating specific surface area of powders
2016 (English)In: International RILEM Conference Materials Systems and Structures in Civil Engineering 2016 (MSSCE 2016) on Fresh Concrete, Paris: Rilem publications, 2016Conference 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
Paris: Rilem publications, 2016
Keywords
water layer theory, specific surface area, Mix Design, Civil engineering and architecture - Building engineering
National Category
Building Technologies
Identifiers
urn:nbn:se:hh:diva-44476 (URN)978-2-35158-184-1 (ISBN)978-2-35158-185-8 (ISBN)
Conference
Materials, Systems and Structures in Civil Engineering 2016 (MSSCE2016), Lyngby, Denmark, 15-29 August, 2016
Available from: 2021-05-28 Created: 2021-05-28 Last updated: 2021-08-17Bibliographically approved

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