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Influence of freezing and thawing on carbonation of concrete materials

ZHANG Peng,ZHAO Tiejun,JIN Zuquan(School of Civil Engineering,Qingdao Technological University,Qingdao 266033,China)  
In order to investigate into the effect of freezing and thawing on carbonation of concrete,four different types of concrete had been studied after exposure to frost cycles and carbonation.Results show that,as a source of concrete deterioration,freezing and thawing action accelerates the carbonation process.CaCO3 content and carbonation depth become higher with increasing number of frost cycles.If exposed to frost cycles in an atmosphere with high CO2 content carbonation of concrete prepared with fly ash is particularly accelerated,which is disadvantage to concrete structure.
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