本文選題：鋁酸鈣水泥　切入點(diǎn)：氧化鋁微粉　出處：《鄭州大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：已有研究發(fā)現(xiàn)氧化鋁微粉會對鋁酸鈣水泥的水化有較大的影響。鋁酸鈣水泥結(jié)合澆注料的性能與鋁酸鈣水泥的水化緊密相關(guān),但目前還沒有關(guān)于不同商品氧化鋁微粉影響鋁酸鈣水泥結(jié)合澆注料的水化、施工性能和力學(xué)性能的系統(tǒng)研究。本研究中選取了粒度有較大差異的四種氧化鋁微粉。在常溫下,研究了這四種氧化鋁微粉對鋁酸鈣水泥的水化,澆注料的流動度、流變性、鋁酸鈣水泥結(jié)合澆注料基質(zhì)的水化和脫模強(qiáng)度,以及澆注料燒后強(qiáng)度的影響。實(shí)驗(yàn)結(jié)果發(fā)現(xiàn):(1)氧化鋁微粉促進(jìn)了鋁酸鈣水泥水化和水泥結(jié)合澆注料基質(zhì)的水化,因而氧化鋁微粉對鋁酸鈣水泥水化的促進(jìn)作用加速了澆注料流動性的衰減。(2)不同粒度的氧化鋁微粉對澆注料的流變行為有不同的影響。添加3%-7%的氧化鋁微粉A和C均使?jié)沧⒘匣|(zhì)試樣在相對較短的時間內(nèi)達(dá)到流變儀的最大扭矩,說明在所測試的60min內(nèi),添加3%-7%氧化鋁微粉A和C的澆注料基質(zhì)中,鋁酸鈣水泥的水化都比較快。在0-60min之間,氧化鋁微粉B和D的添加對澆注料基質(zhì)扭矩隨攪拌時間的影響相近。這一結(jié)果表明粒度較小的微粉A和C都加快了水泥在基質(zhì)中的水化速度,而粒度相對較大的微粉B和D的添加對澆注料基質(zhì)的影響不大。(3)不同粒度的氧化鋁微粉對澆注料的脫模強(qiáng)度有不同的影響。添加粒度較小的氧化鋁微粉A和C的澆注料試樣的脫模強(qiáng)度要高于添加粒度較大氧化鋁微粉B和D的澆注料試樣。這是因?yàn)檩^小粒度的微粉能更好的填充澆注料顆粒和細(xì)粉間孔隙,使?jié)沧⒘嫌休^高的密度;同時,較細(xì)的微粉能更大程度上促進(jìn)澆注料基質(zhì)中水泥的水化速度。(4)澆注料經(jīng)1450℃熱處理后,不同粒度的氧化鋁微粉對澆注料強(qiáng)度的影響的最佳加入量不同。當(dāng)較細(xì)的氧化鋁微粉的加入量為5%時,澆注料的強(qiáng)度最高;而較粗的氧化鋁微粉加入量為7%時,澆注料強(qiáng)度最高,這是因?yàn)椴煌６鹊难趸X微粉對片狀CA6的生成和長大的影響不同。
[Abstract]:It has been found that alumina powder has great influence on the hydration of calcium aluminate cement. The properties of calcium aluminate cement binder are closely related to the hydration of calcium aluminate cement. However, there is no systematic study on the effect of different commercial alumina powder on hydration, construction performance and mechanical properties of calcium aluminate cement binder. In this study, four kinds of alumina powder with different particle size are selected. The hydration of calcium aluminate cement, fluidity and rheology of castable, hydration and demoulding strength of calcium aluminate cement matrix were studied. The experimental results show that the Al _ 2O _ 3 micro-powder can promote the hydration of calcium aluminate cement and the hydration of cement-bonded castable matrix. Therefore, the promoting effect of alumina powder on hydration of calcium aluminate cement accelerates the fluidity attenuation of castable. (2) different sizes of alumina micro-powder have different influence on rheological behavior of castable. The addition of 3- 7% alumina powder A and Al _ 2O _ 3 micropowder has different influence on rheological behavior of castable. C makes the castable matrix sample reach the maximum torque of rheometer in a relatively short time. The results show that the hydration of calcium aluminate cement is faster in the castable matrix containing 3- 7% alumina powder A and C within 60 min, and the hydration of calcium aluminate cement is between 0 and 60 min. The effect of addition of alumina powder B and D on the torque of castable matrix with stirring time is similar. The results show that the micro-powder A and C with smaller particle size can accelerate the hydration rate of cement in the matrix. However, the addition of B and D with relatively larger particle size has little effect on the matrix of castable.) Alumina micro-powder of different particle size has different influence on the demoulding strength of castable, and the addition of alumina micro-powder A and C with smaller particle size has different influence on the demoulding strength of castable. The demoulding strength of castable sample is higher than that of castable sample with larger alumina micropowder B and D. this is because the smaller particle size micro-powder can better fill the castable particle and the pore between fine powder and castable particle. At the same time, the fine powder can promote the hydration rate of cement in the castable matrix to a greater extent. The optimum addition amount of alumina micropowder on the strength of castable is different. When the addition of fine alumina powder is 5, the strength of castable is the highest, while that of coarse alumina powder is 7. The highest strength of castable is due to the different effects of alumina powder on the formation and growth of flake CA6.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ172.1

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