Particle-Matrix Proportioning of High Strength Lightweight Aggregate Concrete

Elisabeth Leite Skare, Jelena Zivkovic, Stefan Jacobsen, Jan Arve Øverli

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

    Abstract

    Production of lightweight aggregate concretes (LWAC) requires specific knowledge and processes in order to achieve good workability of paste and concrete. A particularly demanding case is high strength lightweight aggregate concrete, i.e. having 28-day characteristic compressive strength in the range 60-80 N/mm2 with oven dry density equal or less than 2000kg/m3. Coarse manufactured lightweight aggregates themselves often lack particles smallerthan 2 mm, which together with open aggregate porosity causes a certain loss of workabilityduring the first minutes after mixing. An efficient way of improving this is by particle-matrixproportioning. The desired concrete workability can be obtained by combining the filler modified paste with a suitable amount of coarse aggregate particles. In order to investigate this, several different LWAC mixes have been tested with the lightweight aggregate Stalite, an argillite slate from the US. We found that the particle-matrix proportioning approach can give desired workability of the LWAC mixes. This methodology is economical since no increase in cement and admixtures dosage is needed.
    Original languageEnglish
    Title of host publicationSynerCrete'18 - Interdisciplinary Approaches for Cement-based Materials and Structural Concrete: Synergizing Expertise and Bridging Scales of Space and Time. Vol. 1 & 2
    EditorsMiguel Azenha, Dirk Schlicke, Farid Benboudjema, Agnieszka Jedrzejewska
    Place of PublicationParis
    PublisherRilem publications
    Publication date2018
    Pages279-285
    ISBN (Electronic)1:978-2-35158-211-4, 978-2-35158-212-1, 978-2-35158-202-2, 978-2-35158-203-9
    DOIs
    Publication statusPublished - 2018
    EventInterdisciplinary Approaches for Cement-based Materials and Structural
    Concrete: Synergizing Expertise and Bridging Scales of Space and Time
    - Fuchal, Portugal
    Duration: 24 Oct 201826 Oct 2018

    Conference

    ConferenceInterdisciplinary Approaches for Cement-based Materials and Structural
    Concrete
    Country/TerritoryPortugal
    CityFuchal
    Period24/10/201826/10/2018

    Keywords

    • Lightweight aggregate concrete
    • Crushed fines
    • Proportioning
    • Workability of paste
    • Concrete

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