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The effects of fly ash with different mixing volume and different particle sizes on pore solution of cement-based materials were studied. The pore solution was extracted by squeezing at scheduled ages. The particle size distribution of fly ash was classified as smaller than 45 μm and 45～80 μm,and the mixing volume was classified as 10% and 20%. The concentrations of K+,Na+ and Ca2+ were measured using Inductively Coupled Plasma Emission Spectrometer (ICP),and the pH was measured by acid-base titration. The results indicate that the concentrations of various ions were prompted at the initial time of the hydration. With further hydration,ion concentrations of K+ and Na+ raise again and finally stabilized,but there is a certain decline on Ca2+ later on. It also shows that fly ash exhibited great effect on the hydration of cement,it can lower the concentration of Ca2+ and pH of the pore solution,but raise the concentrations of K+ and Na+. More importantly,ion concentrations of K+,Na+ and Ca2+ reduced with smaller particle sizes of fly ash.
The effects of fly ash with different mixing volume and different particle sizes on pore solution of cement-based materials were studied. The pore size of the fly ash was classified as smaller than 45 μm and The concentrations of K +, Na + and Ca2 + were measured using Inductively Coupled Plasma Emission Spectrometer (ICP), and the pH was measured by acid-base titration. The results indicate that the concentrations of various ions were prompted at the initial time of the hydration. With further hydration, ion concentrations of K + and Na + raise again and finally stabilized, but there is a certain decline on Ca2 + later on. ash significant great effect on the hydration of cement, it can lower the concentration of Ca2 + and pH of the pore solution, but raise the concentrations of K + and Na +. More Importantly, ion concentrations of K +, Na + a nd Ca2 + reduced with smaller particle sizes of fly ash.