本文選題：超細(xì)水泥 + 大摻量　； 參考：《中國礦業(yè)大學(xué)》2015年碩士論文

【摘要】：本文以工業(yè)廢料如低等粉煤灰、礦渣、赤泥等產(chǎn)量大、高污染、利用率低以及水泥資源逐漸枯竭為背景,采用了微觀分析和試驗(yàn)研究相結(jié)合的方法,對在保證強(qiáng)度不降低的情況下提高工業(yè)廢料在超細(xì)水泥中的摻量進(jìn)行了深入的研究。通過X射線衍射、掃面電鏡等微觀測試方法,對粉煤灰等混合材性能進(jìn)行了分析研究,為工業(yè)廢料用作超細(xì)水泥混合材奠定了理論依據(jù)。通過摻入鐵精粉解決采用行星式球磨機(jī)制備超細(xì)水泥時(shí)的粘球、粘磨問題,為制備超細(xì)水泥提供了簡單可行的方法。通過對超細(xì)水泥及粉煤灰進(jìn)行不同程度的粉磨,研究顆粒細(xì)度對混凝土抗壓強(qiáng)度的影響;通過對比摻入不同堅(jiān)固性的混合材后膠砂試件抗壓強(qiáng)度,研究混合材的堅(jiān)固性對混凝土抗壓強(qiáng)度的影響。并對相關(guān)機(jī)理進(jìn)行了分析,為增加混合材摻量提供了方法和依據(jù)。研究結(jié)果表明:水泥熟料和粉煤灰的粉磨細(xì)度對于膠砂試件的抗壓強(qiáng)度影響很大,顆粒越細(xì)水泥的抗壓強(qiáng)度越高,超細(xì)水泥的優(yōu)勢非常明顯;混合材的堅(jiān)固性對水泥膠砂試件的抗壓強(qiáng)度有很大影響,混合材對試件抗壓強(qiáng)度的貢獻(xiàn)為其活性與堅(jiān)固性共同作用的結(jié)果。通過陳化、硫酸鹽激發(fā)、堿激發(fā)等活性激發(fā)試驗(yàn),比較了各種激發(fā)劑的激發(fā)效果,實(shí)現(xiàn)低水灰比下超細(xì)水泥中混合材的大摻量目標(biāo)。研究結(jié)果表明,硫酸鹽激發(fā)下的超細(xì)水泥混合材活性提高明顯,已可將混合材的摻量提升到70%,而且膠砂試件抗壓強(qiáng)度同純水泥熟料的抗壓強(qiáng)度相當(dāng)。堿激發(fā)下的超細(xì)水泥混合材活性較硫酸鹽激發(fā)進(jìn)一步提升,在抗壓強(qiáng)度不低于純水泥熟料的情況下,混合材的摻量已可以達(dá)到90%,大大降低了水泥熟料的用量。通過X射線衍射、掃描電鏡等微觀測試方法,對硫酸鹽激發(fā)和堿激發(fā)下大混合材摻量超細(xì)水泥膠凝材料的最優(yōu)方案進(jìn)行微觀分析及水化機(jī)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.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ172.1

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