本文選題：超細(xì)水泥 + 大摻量��； 參考：《中國礦業(yè)大學(xué)》2017年碩士論文

【摘要】：工業(yè)廢料如低等粉煤灰、礦渣、赤泥等帶來的高產(chǎn)量、高污染和低利用率及水泥的資源短缺是當(dāng)今世界面臨的難題,為解決這兩方面的問題,在配制混凝土?xí)r大摻量使用工業(yè)廢料成為研究的熱點,但是在大摻量混合材條件下配制的混凝土強度很低,制約了其在工程上的應(yīng)用。本文采用微觀分析和試驗研究相結(jié)合的方法,綜合使用水泥熟料超細(xì)粉磨、混合材活性激發(fā)、配合比優(yōu)化和蒸壓養(yǎng)護(hù)手段配制出大混合材摻量(等量取代水泥70%)、高強度(120MPa以上)混凝土。通過X射線衍射、掃描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)。通過對水泥熟料進(jìn)行不同程度粉磨,并對比摻入不同堅固性混合材后膠砂試件抗壓強度,研究水泥熟料顆粒細(xì)度和混合材的堅固性對混凝土抗壓強度的影響。研究結(jié)果表明:粉磨至超細(xì)的水泥可以反填充在混合材顆粒中,使得顆粒之間的粘結(jié)力增加,提高試件強度;而混合材對試件抗壓強度的貢獻(xiàn)為其活性與堅固性共同作用的結(jié)果。通過物理和化學(xué)手段激發(fā)混合材的活性,實現(xiàn)了大摻量混合材超細(xì)水泥強度提高。研究結(jié)果表明:粉煤灰的粉磨細(xì)度對水泥膠砂試件的抗壓強度影響很大,隨著粉煤灰比表面積的增大膠砂試件抗壓強度增大;在大摻量混合材的條件下,與使用常規(guī)的鹽類和堿類激發(fā)劑所不同,使用酸也可以用來激發(fā)混合材的活性。通過蒸養(yǎng)手段進(jìn)一步提高大摻量混合材混凝土的強度,研究了蒸養(yǎng)制度對試件抗壓強度的影響。研究結(jié)果表明:選擇合適的試件初始強度及蒸壓養(yǎng)護(hù)恒溫溫度和時間可以使得試件的抗壓強度大于標(biāo)養(yǎng)28天的抗壓強度,解決了蒸養(yǎng)帶來的強度損失缺陷;蒸壓石灰水浴養(yǎng)護(hù)能解決試件失水問題,可以提高試件強度。通過使用中間集料和鎳鐵砂,實現(xiàn)了配制高強的膠砂試件,在此基礎(chǔ)上研究了混凝土的抗壓強度影響因素。研究表明:添加膠凝材料和鎳鐵砂之間的級配斷層的中間集料可以大幅提高試件的強度;在綜合使用超細(xì)水泥手段、物化激發(fā)混合材活性手段、蒸壓石灰水浴手段和集料優(yōu)化手段配制出的70%混合材摻量的混凝土,強度能夠達(dá)到120MPa以上。
[Abstract]:Industrial waste, such as low grade fly ash, slag, red mud and so on, brings high production, high pollution and low utilization ratio, and the shortage of cement resources is a difficult problem facing the world today. In order to solve these two problems, The use of industrial waste material in the preparation of concrete has become a hot research topic, but the strength of concrete prepared under the condition of large amount of mixed materials is very low, which restricts its application in engineering. In this paper, the microcosmic analysis and experimental study are used to combine the ultra-fine grinding of cement clinker with the activation of the mixture. The mix ratio optimization and autoclaved curing method are used to prepare the concrete with large mixing amount (equal quantity replacing 70% cement and high strength above 120 MPA). 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 grinding cement clinker to different degree and comparing the compressive strength of cement sand specimen with different solid mixture, the effect of particle fineness of cement clinker and the firmness of cement clinker on the compressive strength of concrete was studied. The results show that the cement can be filled in the mixture particles, which can increase the adhesion between the particles and improve the strength of the specimens. The contribution of the mixture to the compressive strength of the specimen is the result of the joint action of its activity and firmness. Through the physical and chemical means to stimulate the activity of the mixture, the strength of the superfine cement with large amount of mixed material was improved. The results show that the grinding fineness of fly ash has a great influence on the compressive strength of cement mortar specimens, and the compressive strength of cement sand specimens increases with the increase of specific surface area of fly ash. Unlike conventional salt and alkali activators, acids can also be used to stimulate the activity of mixtures. The influence of steaming system on the compressive strength of the specimens was studied by means of steaming method to further improve the strength of the concrete with large amount of mixed material. The results show that the compressive strength of the specimen can be higher than that of the standard for 28 days by selecting the appropriate initial strength and the temperature and time of autoclaved curing, which solves the defect of strength loss caused by steaming. Autoclaved lime-water bath curing can solve the water loss problem and improve the strength of the specimen. Through the use of intermediate aggregate and nickel-iron sand, the high-strength mortar specimens were prepared. On this basis, the factors affecting the compressive strength of concrete were studied. The results show that the strength of the specimen can be greatly improved by adding the intermediate aggregate of the graded fault between the cementing material and the Ni-Fe sand. The strength of 70% concrete mixed with autoclaved lime-water bath and aggregate optimization can reach 120 MPA.
【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】：2017
【分類號】：TU528

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