2017 Volume 71 Issue 1 Pages 24-31
The reaction ratio of the fly ash of FA-CH paste was measured. The mixing water was adjusted to pH 12.5, 13.0 and 13.5 using NaOH. The elution of Al ions takes place at early stage of the pozzolanic reaction by alkali stimulation. Al ions work as network modifying oxides when there are present in 5 and 6 coordination. The relationship between the coordination number of Al ions in the glass and the pozzolanic reactivity has been discussed. The content of 5 and 6 coordination of Al ions was calculated from the charge balance of the glass composition. “MG” was defined as the degree of network modifying oxidation considering the coordination number of Al ions and blaine fineness. There was a high correlation between MG and the pozzolanic reactivity of the experimental results in this study. As a result of applying MG to previous studies, the pozzolanic reactivity tended to increase as MG increased in fly ash - Ca（OH）2 paste and cement paste mixed with fly ash. Therefore MG can be used the index to evaluate the pozzolanic reactivity.
