水化硅酸钙粉体对水泥水化反应过程及机理的影响

发布时间：2018-07-10 07:07

本文选题：C-S-H粉体 + 晶种　；参考：《建筑材料学报》2015年02期

【摘要】：将水化硅酸钙(C-S-H)粉体掺入水泥浆中,研究其对水泥水化动力学和反应机理的影响.利用TAM air微量热仪,测量了掺入C-S-H粉体后水泥的水化速率和水化热;采用透过高度法测试了C-S-H粉体的接触角;运用水化动力学分析方法,确定了掺C-S-H粉体后水泥水化反应速率常数K,水化度α,反应级数n等动力学参数;并根据动力学微分曲线评价了C-S-H粉体对水泥水化机理和水化过程的影响.结果表明:C-S-H粉体能降低水泥的水化热总量和成核势垒,并使其水化放热峰提前;C-S-H粉体在水泥水化反应过程中主要起晶种作用;在一定C-S-H粉体掺量(质量分数)范围(1%~3%)内,水泥水化过程符合结晶成核与晶体生长(NG过程)-相边界反应(I过程)-扩散(D过程)的水化机理,C-S-H粉体促进了NG过程,对I过程有一定的削弱作用,而对D过程影响很小.
[Abstract]:The effect of calcium silicate hydrate (C-S-H) powder on the hydration kinetics and reaction mechanism of cement was studied. The hydration rate and heat of cement were measured by air microcalorimeter, the contact angle of C-S-H powder was measured by transmission height method, and the hydration kinetics analysis method was used. The kinetic parameters of cement hydration reaction rate constant K, hydration degree 伪, reaction order n were determined, and the effect of C-S-H powder on cement hydration mechanism and hydration process was evaluated according to the kinetic differential curve. The results show that the content of hydration heat and nucleation barrier of cement can be reduced, and the hydration exothermic peak can play an important role in the hydration reaction of cement, and within a certain amount (mass fraction) of C-S-H powder (1%). The hydration process of cement is consistent with the hydration mechanism of crystal nucleation and crystal growth (NG process), phase boundary reaction (I process) and diffusion (D process). C-S-H powder promotes NG process, weakens I process to some extent, but has little effect on D process.
【作者单位】：重庆大学材料科学与工程学院;东南大学材料科学与工程学院;
【基金】：国家自然科学基金资助项目(50972171) 科技部国际合作项目(2009DFR50450) 重庆大学大型仪器开放基金资助项目(2013121513)
【分类号】：TQ172.11

【参考文献】