Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Investigation of chloride penetration in carbonated reactive magnesia cement mixes exposed to cyclic wetting–drying
https://orcid.org/0000-0001-6066-8254
https://orcid.org/0000-0001-5207-5993
Highlights Effect of chloride attack on carbonated reactive MgO cement (RMC) concrete samples was studied. Replacement of 50% of binder with fly ash (FA) and slag (GGBS) increased resistance to attack. Decreased porosity and formation of hydrate and carbonate phases led to improved performance. Presence of Mg-carbonate phases, brucite, bischofite, calcite and hydrotalcite was observed. Majority of Mg-carbonate phases (hydromagnesite, artinite) remained stable after attack.
Abstract The effect of chloride attack on carbonated reactive MgO cement (RMC) samples containing fly ash (FA) and ground granulated blast-furnace slag (GGBS) under cyclic wetting and drying was studied. Porosity, sorptivity and chloride profile observations were carried out in parallel to the XRD, TGA and SEM analyses performed before and after exposure. Inclusion of SCMs increased the resistance of RMC samples by lowering the porosity and leading to the formation of various phases such as bischofite, hydrotalcite and calcite, in addition to Mg-carbonates. Mg-carbonate phases such as hydromagnesite and artinite remained relatively stable, whereas a small reduction in nesquehonite content was observed after exposure. Resulting formulations presented improved durability and lower environmental impacts.
Investigation of chloride penetration in carbonated reactive magnesia cement mixes exposed to cyclic wetting–drying
https://orcid.org/0000-0001-6066-8254
https://orcid.org/0000-0001-5207-5993
Highlights Effect of chloride attack on carbonated reactive MgO cement (RMC) concrete samples was studied. Replacement of 50% of binder with fly ash (FA) and slag (GGBS) increased resistance to attack. Decreased porosity and formation of hydrate and carbonate phases led to improved performance. Presence of Mg-carbonate phases, brucite, bischofite, calcite and hydrotalcite was observed. Majority of Mg-carbonate phases (hydromagnesite, artinite) remained stable after attack.
Abstract The effect of chloride attack on carbonated reactive MgO cement (RMC) samples containing fly ash (FA) and ground granulated blast-furnace slag (GGBS) under cyclic wetting and drying was studied. Porosity, sorptivity and chloride profile observations were carried out in parallel to the XRD, TGA and SEM analyses performed before and after exposure. Inclusion of SCMs increased the resistance of RMC samples by lowering the porosity and leading to the formation of various phases such as bischofite, hydrotalcite and calcite, in addition to Mg-carbonates. Mg-carbonate phases such as hydromagnesite and artinite remained relatively stable, whereas a small reduction in nesquehonite content was observed after exposure. Resulting formulations presented improved durability and lower environmental impacts.
Investigation of chloride penetration in carbonated reactive magnesia cement mixes exposed to cyclic wetting–drying
https://orcid.org/0000-0001-6066-8254
https://orcid.org/0000-0001-5207-5993
Highlights Effect of chloride attack on carbonated reactive MgO cement (RMC) concrete samples was studied. Replacement of 50% of binder with fly ash (FA) and slag (GGBS) increased resistance to attack. Decreased porosity and formation of hydrate and carbonate phases led to improved performance. Presence of Mg-carbonate phases, brucite, bischofite, calcite and hydrotalcite was observed. Majority of Mg-carbonate phases (hydromagnesite, artinite) remained stable after attack.
Abstract The effect of chloride attack on carbonated reactive MgO cement (RMC) samples containing fly ash (FA) and ground granulated blast-furnace slag (GGBS) under cyclic wetting and drying was studied. Porosity, sorptivity and chloride profile observations were carried out in parallel to the XRD, TGA and SEM analyses performed before and after exposure. Inclusion of SCMs increased the resistance of RMC samples by lowering the porosity and leading to the formation of various phases such as bischofite, hydrotalcite and calcite, in addition to Mg-carbonates. Mg-carbonate phases such as hydromagnesite and artinite remained relatively stable, whereas a small reduction in nesquehonite content was observed after exposure. Resulting formulations presented improved durability and lower environmental impacts.
Investigation of chloride penetration in carbonated reactive magnesia cement mixes exposed to cyclic wetting–drying
Kumar, Sanjeev (Autor:in) / Yang, En-Hua (Autor:in) / Unluer, Cise (Autor:in)
23.02.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
ENHANCED REACTIVE MAGNESIA CEMENT-BASED CONCRETE MIXES
| Europäisches Patentamt | 2018