Abstract
For the purpose of effective use of fly-ash, which is a by-product thermal power generation, fly-ash is applied to the precasted concrete products which is substituted by a large amount of fly-ash in recent years. It is heated by the steam curing for the promotion of pozzolanic reaction of fly-ash in genaral. Since the chemical reactions “hydration of cement” and “pozzolanic reaction of fly-ash” occur simultaneously, the reaction analysis of fly-ash cement with steam curing is very difficult.
We have tried a detailed reaction analysis of fly ash cement, which has been subjected to heat curing, by considering the chain length distribution of siloxane oligomers constituting the silicate phases of reaction products. By considering the chain length distribution analysis of siloxane oligomers by subtracting the components of silcates included in unreacted cement（C3S and C2S）, it was found that the “dimer” type silicate included in the siloxane oligomers is generated predominantly on the pozzolanic reaction of fly-ash. The correlation of the “CaO/SiO2” ratio in reacted products and “reactive monomer / dimer” ratio of siloxane oligomers generate by the reactoins of fly-ash cement were suggested.
