大混合材掺量超细水泥制备技术研究

发布时间：2018-05-15 10:21

本文选题：超细水泥 + 大掺量　；参考：《中国矿业大学》2015年硕士论文

【摘要】：本文以工业废料如低等粉煤灰、矿渣、赤泥等产量大、高污染、利用率低以及水泥资源逐渐枯竭为背景,采用了微观分析和试验研究相结合的方法,对在保证强度不降低的情况下提高工业废料在超细水泥中的掺量进行了深入的研究。通过X射线衍射、扫面电镜等微观测试方法,对粉煤灰等混合材性能进行了分析研究,为工业废料用作超细水泥混合材奠定了理论依据。通过掺入铁精粉解决采用行星式球磨机制备超细水泥时的粘球、粘磨问题,为制备超细水泥提供了简单可行的方法。通过对超细水泥及粉煤灰进行不同程度的粉磨,研究颗粒细度对混凝土抗压强度的影响;通过对比掺入不同坚固性的混合材后胶砂试件抗压强度,研究混合材的坚固性对混凝土抗压强度的影响。并对相关机理进行了分析,为增加混合材掺量提供了方法和依据。研究结果表明:水泥熟料和粉煤灰的粉磨细度对于胶砂试件的抗压强度影响很大,颗粒越细水泥的抗压强度越高,超细水泥的优势非常明显;混合材的坚固性对水泥胶砂试件的抗压强度有很大影响,混合材对试件抗压强度的贡献为其活性与坚固性共同作用的结果。通过陈化、硫酸盐激发、碱激发等活性激发试验,比较了各种激发剂的激发效果,实现低水灰比下超细水泥中混合材的大掺量目标。研究结果表明,硫酸盐激发下的超细水泥混合材活性提高明显,已可将混合材的掺量提升到70%,而且胶砂试件抗压强度同纯水泥熟料的抗压强度相当。碱激发下的超细水泥混合材活性较硫酸盐激发进一步提升,在抗压强度不低于纯水泥熟料的情况下,混合材的掺量已可以达到90%,大大降低了水泥熟料的用量。通过X射线衍射、扫描电镜等微观测试方法,对硫酸盐激发和碱激发下大混合材掺量超细水泥胶凝材料的最优方案进行微观分析及水化机理分析。
[Abstract]:Under the background of industrial waste such as low fly ash, slag, red mud, high yield, high pollution, low utilization ratio and gradual depletion of cement resources, the method of combining microscopic analysis with experimental research is adopted in this paper. Increasing the content of industrial waste in ultrafine cement without decreasing the strength is studied in this paper. By means of X-ray diffraction, scanning electron microscope and other micro-test methods, the properties of fly ash and other mixtures were analyzed and studied, which laid a theoretical foundation for industrial waste as ultra-fine cement mixture. By adding iron powder to solve the problem of sticky ball and grinding in the process of preparing ultrafine cement with planetary ball mill, this paper provides a simple and feasible method for the preparation of ultrafine cement. The effect of particle fineness on the compressive strength of concrete was studied by grinding the ultrafine cement and fly ash to different degrees. The effect of the rigidity of the mixture on the compressive strength of concrete is studied. The related mechanism is analyzed, which provides the method and basis for increasing the mixing amount. The results show that the grinding fineness of cement clinker and fly ash has a great influence on the compressive strength of cement sand. The higher the particle size is, the higher the compressive strength of cement is, and the superiority of ultrafine cement is very obvious. The compressive strength of cement mortar specimens is greatly affected by the robustness of the mixture, and the contribution of the mixture to the compressive strength of the specimens is the result of the joint action of its activity and robustness. Through the activation tests of aging, sulfate and alkali, the excitation effect of various activators was compared to achieve the goal of high content of superfine cement mixture under low water-cement ratio. The results show that the activity of ultrafine cement mixture excited by sulfate has been improved obviously, and the content of mixture can be increased to 70%, and the compressive strength of cement sand specimen is equal to that of pure cement clinker. The activity of ultrafine cement mixture excited by alkali is further improved than that of sulfate. When the compressive strength is not lower than that of pure cement clinker, the mixing amount can reach 90%, which greatly reduces the amount of cement clinker. By means of X-ray diffraction and scanning electron microscopy, the optimum scheme of superfine cement cementitious materials with large amount of mixed materials excited by sulfate and alkali was analyzed by microcosmic analysis and hydration mechanism analysis.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ172.1

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