Chemical resistance of eco-concrete – Experimental approach on Ca-leaching and sulphate attack

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

The chemical resistance of eco-concrete with high levels (35–65 wt-%) of limestone substitution against Ca-leaching behaviour and sulphate attack was investigated by immersing powdered material in a 10 g L−1 Na2SO4 solution. Time-resolved hydrochemical characterisation of the reactive solutions was coupled with chemical, structural and mineralogical characterisation of the experimental solid materials to describe and to quantify alteration phenomena like the dissolution of portlandite and AFm-phases, transformation of C-S-H gel and the precipitation of ettringite, calcite and hydrogarnet. Nucleation and crystal growth dynamics of ettringite are controlled by the availability of Ca, reactive Al, solution pH and potentially the amount of clay minerals and/or superplasticiser used in the eco-concrete material. The experimental approach allows revealing competing reaction pathways and kinetics causing concrete damage in sulphate-loaded environments and to tailor eco-concrete towards an elevated degree of chemical resistance.

Originalspracheenglisch
Seiten (von - bis)55-68
Seitenumfang14
FachzeitschriftConstruction and Building Materials
Jahrgang223
DOIs
PublikationsstatusVeröffentlicht - 30 Okt 2019

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Chemical resistance
Leaching
Sulfates
Concretes
Calcium Carbonate
Calcite
Crystallization
Clay minerals
Limestone
Crystal growth
Dissolution
Nucleation
Substitution reactions
Gels
Phase transitions
Availability
Kinetics
ettringite

Schlagwörter

    ASJC Scopus subject areas

    • !!Civil and Structural Engineering
    • !!Building and Construction
    • !!Materials Science(all)

    Fields of Expertise

    • Advanced Materials Science
    • Sustainable Systems

    Dies zitieren

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    title = "Chemical resistance of eco-concrete – Experimental approach on Ca-leaching and sulphate attack",
    abstract = "The chemical resistance of eco-concrete with high levels (35–65 wt-{\%}) of limestone substitution against Ca-leaching behaviour and sulphate attack was investigated by immersing powdered material in a 10 g L−1 Na2SO4 solution. Time-resolved hydrochemical characterisation of the reactive solutions was coupled with chemical, structural and mineralogical characterisation of the experimental solid materials to describe and to quantify alteration phenomena like the dissolution of portlandite and AFm-phases, transformation of C-S-H gel and the precipitation of ettringite, calcite and hydrogarnet. Nucleation and crystal growth dynamics of ettringite are controlled by the availability of Ca, reactive Al, solution pH and potentially the amount of clay minerals and/or superplasticiser used in the eco-concrete material. The experimental approach allows revealing competing reaction pathways and kinetics causing concrete damage in sulphate-loaded environments and to tailor eco-concrete towards an elevated degree of chemical resistance.",
    keywords = "Durability, Eco-concrete, Ettringite, Leaching, Limestone, Sulphate attack",
    author = "Steindl, {Florian R.} and Andre Baldermann and Isabel Galan and Marlene Sakoparnig and Lukas Briendl and Martin Dietzel and Florian Mittermayr",
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    AU - Steindl, Florian R.

    AU - Baldermann, Andre

    AU - Galan, Isabel

    AU - Sakoparnig, Marlene

    AU - Briendl, Lukas

    AU - Dietzel, Martin

    AU - Mittermayr, Florian

    PY - 2019/10/30

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    N2 - The chemical resistance of eco-concrete with high levels (35–65 wt-%) of limestone substitution against Ca-leaching behaviour and sulphate attack was investigated by immersing powdered material in a 10 g L−1 Na2SO4 solution. Time-resolved hydrochemical characterisation of the reactive solutions was coupled with chemical, structural and mineralogical characterisation of the experimental solid materials to describe and to quantify alteration phenomena like the dissolution of portlandite and AFm-phases, transformation of C-S-H gel and the precipitation of ettringite, calcite and hydrogarnet. Nucleation and crystal growth dynamics of ettringite are controlled by the availability of Ca, reactive Al, solution pH and potentially the amount of clay minerals and/or superplasticiser used in the eco-concrete material. The experimental approach allows revealing competing reaction pathways and kinetics causing concrete damage in sulphate-loaded environments and to tailor eco-concrete towards an elevated degree of chemical resistance.

    AB - The chemical resistance of eco-concrete with high levels (35–65 wt-%) of limestone substitution against Ca-leaching behaviour and sulphate attack was investigated by immersing powdered material in a 10 g L−1 Na2SO4 solution. Time-resolved hydrochemical characterisation of the reactive solutions was coupled with chemical, structural and mineralogical characterisation of the experimental solid materials to describe and to quantify alteration phenomena like the dissolution of portlandite and AFm-phases, transformation of C-S-H gel and the precipitation of ettringite, calcite and hydrogarnet. Nucleation and crystal growth dynamics of ettringite are controlled by the availability of Ca, reactive Al, solution pH and potentially the amount of clay minerals and/or superplasticiser used in the eco-concrete material. The experimental approach allows revealing competing reaction pathways and kinetics causing concrete damage in sulphate-loaded environments and to tailor eco-concrete towards an elevated degree of chemical resistance.

    KW - Durability

    KW - Eco-concrete

    KW - Ettringite

    KW - Leaching

    KW - Limestone

    KW - Sulphate attack

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    JO - Construction & building materials

    JF - Construction & building materials

    SN - 0950-0618

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