Effect of Addition of Free Lime in Fly Ash on Chloride Binding Capacity of Paste with Fly Ash and Limestone Powder
Keywords:
Free lime, Fly ash, Limestone powder, ChlorideAbstract
The aim of this research was to study the effect of free lime (fCaO) in the fly ash on chloride binding capacity of ordinary Portland cement (OPC) paste replaced by fly ash and limestone powder. The original fly ash added fCaO in order to the fly ash having different amounts of fCaO. The results showed that the total chloride content of paste of OPC replaced with 10% limestone powder was less, while the chloride binding capacity was higher when compared with OPC paste. Besides, paste replacing OPC with 30% fly ash showed the total chloride content and the fixed chloride ratio were similar to that of OPC paste. In addition, paste that replaced OPC with 20% fly ash together with 10% limestone powder gave the total chloride content close to, but the fixed chloride ratio was less tendency when compared with OPC paste. Finally, the different amounts of fCaO in fly ash did not affect the total chloride content and the chloride binding capacity of the pastes.
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