纳米水泥熟料矿物的合成与性能研究

发布时间：2018-05-18 11:07

  本文选题：纳米水泥熟料矿物 + 燃烧法　； 参考：《河北联合大学》2014年硕士论文

【摘要】：以尿素为燃料，采用燃烧法合成了纳米硅酸三钙（C3S）、硅酸二钙（C2S）、铝酸三钙（C3A）、铁铝酸四钙（C4AF）四种水泥熟料矿物。研究了化学计量比和引燃温度对合成产物中游离氧化钙（f-CaO）含量的影响；用X射线衍射仪、场发射扫描电镜、Zeta电位及纳米粒度分析仪表征了四种合成产物的相组成、微观形貌和粒度分布；通过微量热仪测试合成产物的水化热；用场发射扫描电镜观察不同龄期水化产物的形貌；通过Zeta电位的测定，考察了萘系和聚羧酸系减水剂对纳米C3S和C2S矿物分散性的影响；测定了纳米C3S和C2S不同龄期的强度。 结果表明：燃烧法合成纳米水泥熟料矿物时，随着化学计量比和引燃温度的增大，产物中f-CaO含量均呈先降低后升高的趋势，当化学计量比分别为0.24（合成C3S），0.45（以硅灰为硅源合成C2S）、0.38（以硅溶胶为硅源合成C2S），，0.71（合成C3A和C4AF），引燃温度为700℃时，产物中f-CaO含量达到最低。 合成的C3S和C2S的平均粒径分别为292nm和241nm（以硅灰为硅源），226nm和177nm（以硅溶胶为硅源）；合成的C3A和C4AF的平均粒径分别为265nm和350nm。 合成的四种矿物均表现出较高的水化活性，其中C3S水化时只出现一个放热峰；C2S水化时出现两个放热峰，诱导期大大缩短，第二峰值出现较早。两种矿物不同龄期的抗压强度均相差不大，且较普通硅酸盐水泥强度明显降低。
[Abstract]:Four kinds of cement clinker minerals were synthesized by combustion method using urea as fuel, such as tricalcium silicate C3SU, dicalcium silicate C2SU, tricalcium aluminate C3AN, tetracalcium ferrate C4AFs. The effects of stoichiometry and ignition temperature on the content of free calcium oxide f-CaO in the synthesized products were studied, and the phase compositions of the four synthesized products were characterized by X-ray diffraction, field emission scanning electron microscope (SEM) Zeta potential and nanometer particle size analyzer. Microscopic morphology and particle size distribution; hydration heat of synthesized products measured by microcalorimeter; morphology of hydration products at different ages were observed by field emission scanning electron microscopy; Zeta potential was measured. The effects of naphthalene and polycarboxylic acid superplasticizer on the dispersity of nanocrystalline C 3s and C 2S minerals were investigated, and the strength of nano C 3s and C 2S at different ages were determined. The results show that with the increase of stoichiometric ratio and ignition temperature, the content of f-CaO in the product decreases first and then increases with the increase of stoichiometric ratio and ignition temperature when the nano-cement clinker minerals are synthesized by combustion method. When the stoichiometric ratio was 0.24 (synthetic C _ 3S _ 2O _ (0.45) (silica fume as silicon source) C _ 2S _ (+) 0.38 (Si _ (3) sol) _ (0.71) (C _ (3A) and C _ (4AFN), ignition temperature was 700 鈩

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