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《Journal of Southeast University(Natural Science Edition)》 2006-01
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Hydration process of Portland cement-fly ash pastes

Zhang Yunsheng~1 Sun Wei~1 Zheng Keren~1 Jia Yantao~2(~1Department of Materials Science and Engineering,Southeast University,Nanjing 210096,China)(~2Department of Materials Science and Engineering,Hohai University,Nanjing 210016,China)  
To explore the hydration process of Portland cement-fly ash system, the reaction degree of fly ash and Portland cement,non-evaporable water content,amount of hydration products,porosity and compressive strength of pure cement pastes and cement-fly ash pastes were studied at various curing ages,water-to-binder ratio(W/B),and fly ash replacement percentages.Based on the experimental results,the relationship between the degree of cement hydration and the effective water-to-cement(W/C) ratio,which is given by W/(C+α_FF),is established.An equation describing the dependence of gel/space ratio on the degree of cement hydration and fly ash reaction is also proposed.The calculated gel/space ratios for cement-fly ash pastes are consistent with those for pure cement pastes in terms of their relationship with compressive strength.The proposed equation is verified by comparing the calculated gel/space ratios with the measured porosity by mercury intrusion porosimetry.Thus the proposed equation has been justified.In addition,the relationship between non-evaporable water content and amount of hydration products calculated by the degree of cement hydration and fly ash reaction is explored.The linear correlativity shows that the amount of hydration products can be figured out by using non-evaporable water content.
【Fund】: 国家自然科学基金资助项目(50278018);; 南京水利科学研究院开放流动研究基金资助项目(Yk90508);; 教育部重点实验室开放基金资助项目(SYSJJ2004-02)
【CateGory Index】: TU528
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