本文選題：納米水泥熟料礦物 + 燃燒法�。� 參考：《河北聯(lián)合大學》2014年碩士論文

【摘要】：以尿素為燃料，采用燃燒法合成了納米硅酸三鈣（C3S）、硅酸二鈣（C2S）、鋁酸三鈣（C3A）、鐵鋁酸四鈣（C4AF）四種水泥熟料礦物。研究了化學計量比和引燃溫度對合成產(chǎn)物中游離氧化鈣（f-CaO）含量的影響；用X射線衍射儀、場發(fā)射掃描電鏡、Zeta電位及納米粒度分析儀表征了四種合成產(chǎn)物的相組成、微觀形貌和粒度分布；通過微量熱儀測試合成產(chǎn)物的水化熱；用場發(fā)射掃描電鏡觀察不同齡期水化產(chǎn)物的形貌；通過Zeta電位的測定，考察了萘系和聚羧酸系減水劑對納米C3S和C2S礦物分散性的影響；測定了納米C3S和C2S不同齡期的強度。 結(jié)果表明：燃燒法合成納米水泥熟料礦物時，隨著化學計量比和引燃溫度的增大，產(chǎn)物中f-CaO含量均呈先降低后升高的趨勢，當化學計量比分別為0.24（合成C3S），0.45（以硅灰為硅源合成C2S）、0.38（以硅溶膠為硅源合成C2S），，0.71（合成C3A和C4AF），引燃溫度為700℃時，產(chǎn)物中f-CaO含量達到最低。 合成的C3S和C2S的平均粒徑分別為292nm和241nm（以硅灰為硅源），226nm和177nm（以硅溶膠為硅源）；合成的C3A和C4AF的平均粒徑分別為265nm和350nm。 合成的四種礦物均表現(xiàn)出較高的水化活性，其中C3S水化時只出現(xiàn)一個放熱峰；C2S水化時出現(xiàn)兩個放熱峰，誘導期大大縮短，第二峰值出現(xiàn)較早。兩種礦物不同齡期的抗壓強度均相差不大，且較普通硅酸鹽水泥強度明顯降低。
[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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