【摘 要】
：
Cement pastes incorporated with 0%, 15%, 25% and 35% of fly ash by weight were prepared.Alter 90d ot curing, the cement pastes were crushed and ground into powders with a particle size less than 0.080
【机 构】
：
College of Materials and Engineering, Nanjing Tech University, Jiangsu 210009, P.R.China
【出 处】
：
The 14th International Congress on the Chemistry of Cement (
论文部分内容阅读
Cement pastes incorporated with 0%, 15%, 25% and 35% of fly ash by weight were prepared.Alter 90d ot curing, the cement pastes were crushed and ground into powders with a particle size less than 0.080mm, and then the powders were soaked in de-ionized water.The concentrations of Na+ and K+ ions in the water were measured.Results show that the K+ and Na+ ions in cement pastes enter rapidly into the de-ionized water during the first 120 minutes, and then were released at a relatively slow rate.A steady-state alkali partition was reached at about 720min.Available alkali contents were 65.5%, 66.0%, 64.3% and 63.8% for cement pastes contained 0%, 15%, 25% and 35% of fly ash and cured for 90 days.No significant effect of fly ash on the retaining of available alkalis on solids of cement pastes was observed.These releasable alkali ions may exist in bulk pore solutions or be physically absorbed by solids of cement pastes.
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