Chloride Penetration and Carbonation in Geopolymer Concrete

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Title: Chloride Penetration and Carbonation in Geopolymer Concrete

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Publication: CIA

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Date: 2/28/2011

Abstract:
The use of industrial by-products to partly substitute ordinary Portland cement (OPC) has become common practice. However, the total replacement of OPC has only recently become a focus of research due to the environmental impact, as the production of OPC greatly contributes to the production of CO2 to the atmosphere. Research has shown that alkali activated binders can achieve similar strengths to both ordinary Portland cement (OPC) and blended cements. However, to date little research has been undertaken on their durability properties. This study investigated the influence of activator concentration and alkali modulus (mass ratio SiO2 to Na2O) on chloride penetration and carbonation of alkali activated slag (AAS) and fly ash (FA) based geopolymer concrete. The same tests were also conducted on blended ordinary Portland cement and ground granulated blast-furnace slag (OPC-GGBS) concrete with 30%, 50%, and 70% partial replacement of OPC by GGBS, and a control, with no replacement material. Results indicate that Minimal strength development was observed for both the AAS and FA geopolymer concrete for an Alkali Modulus above 1.0. The alkali modulus has a major effect on charge passed for AAS concrete, however no significant effect on carbonation was observed for the AAS concrete.


Concrete Institute of Australia, International Partner Access.

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