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

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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.

Original languageEnglish
Pages (from-to)55-68
Number of pages14
JournalConstruction and Building Materials
Volume223
DOIs
Publication statusPublished - 30 Oct 2019

Fingerprint

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

Keywords

  • Durability
  • Eco-concrete
  • Ettringite
  • Leaching
  • Limestone
  • Sulphate attack

ASJC Scopus subject areas

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

Fields of Expertise

  • Advanced Materials Science
  • Sustainable Systems

Cite this

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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",
year = "2019",
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T1 - Chemical resistance of eco-concrete – Experimental approach on Ca-leaching and sulphate attack

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

Y1 - 2019/10/30

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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DO - 10.1016/j.conbuildmat.2019.06.189

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JO - Construction & building materials

JF - Construction & building materials

SN - 0950-0618

ER -