【摘 要】
：
C 3 S pastes containing 0%,5%,10%,and 15% nano-SiO2 mixed with de-ionized water and alkali solutions were prepared.When C 3 S was completely hydrated,the pastes were ground into powders with a particle size less than 80 μm.Adsorption and desorption charac
【机 构】
：
State Key Laboratory of Materials Oriented Chemical Engineering,College of Materials Science and Eng
【出 处】
：
武汉理工大学学报（材料科学版）（英文版）
论文部分内容阅读
C 3 S pastes containing 0%,5%,10%,and 15% nano-SiO2 mixed with de-ionized water and alkali solutions were prepared.When C 3 S was completely hydrated,the pastes were ground into powders with a particle size less than 80 μm.Adsorption and desorption characteristics of alkali ions adsorbed by C 3 S-nano SiO2 pastes mixed with de-ionized water immersed in alkali solutions and those in C 3 S-nano SiO2 pastes mixed with alkali solutions,were investigated.Meawhile,the adsorption mechanisms of alkali ions were discussed.Results showed that the contents of alkali ions adsorbed by C 3 S-nano SiO2 pastes mixed with de-ionized water increased with increasing substitution levels of nano-SiO2 and/or the initial alkali concentrations.In C 3 S-nano SiO2 pastes mixed with de-ionized water,each paste was characterized by having a fixed alkali-adsorption capacity that was essentially independent of alkali concentration.No obvious difference between the adsorption capacity of a given paste for K+ and Na+ was observed.Adsorption of alkali ions in the pastes is considered to be caused by surface force which is related to the BET specific surface area of the paste,and charge compensation of C-S-H gel,mainly by electrostatic interactions.In C 3 S-nano SiO2 pastes mixed with alkali solutions,alkali ions may enter the structure of C-S-H gel to replace a part of Ca2+ in the interlayer.This assumption is supported by the structural characterization of C-S-H gel using 29 Si MAS NMR.
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