Flowability and proportioning of cementitious mixtures

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Ghasemi, Yahya,1982-Luleå tekniska universitet,Byggkonstruktion och brand,Luleå University of Technology, Luleå, Sweden (författare)

Flowability and proportioning of cementitious mixtures

BokEngelska2019

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Luleå :Luleå University of Technology,2019
electronicrdacarrier

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LIBRIS-ID:oai:DiVA.org:ltu-73152
ISBN:9789177903284
ISBN:9789177903291
https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-73152URI
https://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-44480URI

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Språk:engelska
Sammanfattning på:engelska

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Ämneskategori:dok swepub-publicationtype

Varianttitlar

Flytbarhet och proportionering avcementblandnigar

Serie

Doctoral thesis / Luleå University of Technology 1 jan 1997 → …,1402-1544
Doctoral thesis / Luleå University of Technology,1402-1544

Anmärkningar

Understanding the role of constituents of cementitious mixtures as the most globally used human-made material and their effect on the flowability of the blends is of great importance. A comprehensive understanding of the ingredients of mixtures allows for optimized proportioning of constituents and can lead to a reduction in cement and water demand of the blends.The thesis focuses on relating the flow of mixtures to the specific surface area of the particles through the concepts of excess water layer theory by assuming that the particles are enveloped by a thin film layer that separates the grains and lubricates their surfaces. However, in order to study the film thickness, it is inevitable to consider packing density and specific surface area of the particles. Both of the mentioned parameters and their influence on water requirement of mixtures were investigated as a part of the project.The theoretical part of the thesis includes background and explanation of the concepts and theories used in conducting the research including particle packing theory, specific surface area, and excess layer theories. In addition, the thesis attempts at defining and formulating terms and parameters such as representative shape, mixer efficiency, and optimal packing.The experimental part of the thesis consists of laboratory measurements of packing density in the loose state, estimation of specific surface area using microtomography and slump tests for mortar and concrete.The results of the thesis indicate that the available packing models can estimate the packing density with acceptable accuracy. In addition, it was shown that it is possible to estimate flowability of mixtures based on information about the specific surface area of the constituents. A mix design approach is introduced which predicts flow spread of slump test, a measure that is often used in laboratories and at the building sites.Moreover, the research revealed that the estimation of the specific surface area of particles can be improved by assuming a platonic solid shape for the particles instead of spheres. Furthermore, the mixer efficiency was quantified and optimization of mixtures against packing density and water requirement was explained.The finding of the project lays a foundation for a simple workability based mix design approach.

Ämnesord och genrebeteckningar

TEKNIK OCH TEKNOLOGIER Samhällsbyggnadsteknik Annan samhällsbyggnadsteknik hsv//swe
ENGINEERING AND TECHNOLOGY Civil Engineering Other Civil Engineering hsv//eng
TEKNIK OCH TEKNOLOGIER Samhällsbyggnadsteknik Husbyggnad hsv//swe
ENGINEERING AND TECHNOLOGY Civil Engineering Building Technologies hsv//eng
Particle packing
excess layer theory
mix design
Structural Engineering
Konstruktionsteknik

Biuppslag (personer, institutioner, konferenser, titlar ...)

Emborg, MatsLuleå tekniska universitet,Byggkonstruktion och brand,Luleå University of Technology, Luleå, Sweden(Swepub:ltu)mem (preses)
Cwirzen, AndrzejLuleå tekniska universitet,Byggkonstruktion och brand,Luleå University of Technology, Luleå, Sweden(Swepub:ltu)andcwi (preses)
Nilsson, MartinLuleå tekniska universitet,Byggkonstruktion och brand,Luleå University of Technology, Luleå, Sweden(Swepub:ltu)manil (preses)
Jacobsen, Stefan,ProfessorNorwegian university of science and technology, NTNU (opponent)
Luleå tekniska universitetByggkonstruktion och brand (creator_code:org_t)

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Av författaren/redakt...: Ghasemi, Yahya, ...; Emborg, Mats; Cwirzen, Andrzej; Nilsson, Martin; Jacobsen, Stefan ...

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TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Samhällsbyggnads ...; och Annan samhällsby ...

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Samhällsbyggnads ...; och Husbyggnad

Delar i serien: Doctoral thesis ...

Av lärosätet: Luleå tekniska universitet; Högskolan i Halmstad

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