Effect of Organic Grinding Aids on Cement Properties and the Analysis via Organic Cement Chemistry

作者：Wang Dongmin · 发表于：Guisuanyan xuebao · 年份：2012 · 被引用次数：9 · 研究领域：Mineral Processing and Grinding、Industrial Technology and Control Systems、Minerals Flotation and Separation Techniques

The majority of chemicals,especially organic chemicals and polymers are used as grinding aids,superplasticizers,air en-training agents,thickeners,etc.in cement and concrete engineering.The cement hydration process,kinetics,microstructural devel-opment,relation between microstructure and macroscopic properties of cement and concrete could be substantially altered when the organic substances are added into cement and concrete,which could not be analyzed by the conventional theory on chemistry of ce-ment and concrete.A novel branch to chemistry of cement and concrete,namely,the 'organic cement chemistry',were proposed for the research of cement and concrete.The effects of organic additives like grinding aids on the kinetics of cement hydration,morphol-ogy of cement hydrates as well as on the macroscopic properties such as superplasticizer demand,rheological properties,strength development etc were exemplified.It was indicated that besides the particle size distribution,the small amount of grinding aids added into cement could alter the kinetics of cement hydration,accelerate the initial dissolution of ions and early hydration of C3A and C4AF,and finally enhance the early strength and even 28-days strength to a visible extent.The surface modification via the adsorption of organic grinding aids on cement surface and the chelating effect between the grinding aids and Ca2+,Fe2+ should be analyzed based on the proposed 'organic cement chemistry'.