Biological Attachment and Carbon Reduction Effectiveness of Porous Ecological Concrete with Oyster Shell Powder for Artificial Reefs
To reduce alkalinity and carbon emissions of porous concrete and improve its biological attach-ment,porous ecological concrete was prepared with the recycled coarse aggregate as raw material and ce-ment partially replaced by the oyster shell powder.Mechanical properties,alkalinity,biological attach-ment and carbon emissions of concrete samples were studied.Results showed that compared to the con-crete without oyster shell powder,the compressive strength of porous ecological concrete samples with re-placement rate of 20%decreased by 13.2%,the pH value of leachate dropped by 0.67,the biological at-tachment index increased by 33.4%,and the total carbon emissions reduced by 29.8%.When the replace-ment rate of oyster shell powder was 40%,the compressive strength decreased by 26.7%,the pH value of leachate dropped by 1.28,the biological attachment index increased by 83.4%,and the total carbon emis-sions reduced by 59.7%.The optimal replacement rate for biological attachment and carbon emissions was 40%.It provides an effective way to improve ecological performance of artificial reefs.
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