發(fā)布時間：2018-01-14 22:03

  本文關(guān)鍵詞：高硅型鐵尾礦對混凝土和易性及抗壓強(qiáng)度影響試驗研究　出處：《東北大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 高硅型鐵尾礦 混凝土 和易性 抗壓強(qiáng)度 機(jī)械力化學(xué)

【摘要】：本文選擇高硅型鐵尾礦作為研究對象(尾礦來源于遼寧省鞍山齊大山鐵礦)。對該種尾礦進(jìn)行了性能測試及分析,包括尾礦的化學(xué)成分分析、礦物成分分析、粒度分析、活性分析,分析結(jié)果表明,該尾礦的主要化學(xué)成分為SiO2,主要礦物成分為石英,粒度集中分布在120μm,無火山灰活性�；跈C(jī)械力化學(xué)基本原理,將所研究的尾礦進(jìn)行機(jī)械力粉磨,經(jīng)過粉磨,其粒度達(dá)到了12.231μm。XRD顯示,粉磨后的SiO2結(jié)晶程度降低明顯,火山灰性合格。經(jīng)過機(jī)械力化學(xué)活化的高硅型鐵尾礦與水泥復(fù)合而成的復(fù)合膠凝材料,標(biāo)準(zhǔn)稠度用水量、初終凝時間與水泥的標(biāo)準(zhǔn)稠度用水量、初終凝時間相近,安定性合格。將經(jīng)機(jī)械力化學(xué)活化的高硅型鐵尾礦作為混凝土輔助膠凝材料,以一定的比例取代水泥配制混凝土,通過試驗探索該尾礦對混凝土拌合物和易性及抗壓強(qiáng)度的影響。和易性試驗結(jié)果表明：隨著尾礦摻量的增加,混凝土拌合物的坍落度降低,混凝土拌合物的粘聚性和保水性隨著尾礦摻量的增加增強(qiáng)。尾礦取代水泥的量為20%時,混凝土拌合物坍落度滿足設(shè)計要求�？箟簭�(qiáng)度試驗結(jié)果表明：隨著尾礦取代水泥量的增加,混凝土強(qiáng)度有不同程度的下降,尾礦取代水泥量不超過30%,滿足設(shè)計強(qiáng)度C30要求。摻入減水劑可顯著提高混凝土抗壓強(qiáng)度,此時,尾礦取代水泥量為40%時仍能達(dá)到設(shè)計強(qiáng)度C30。通過XRD及SEM對水泥硬化漿體及尾礦一水泥硬化漿體進(jìn)行了物相及微觀測試分析,試驗結(jié)果表明,同齡期比較Ca(OH)2最強(qiáng)衍射峰總是出現(xiàn)在水泥凈漿一組；同時,SEM顯示隨著齡期的增加,未反應(yīng)的尾礦顆粒表面逐漸被水化產(chǎn)物覆蓋,和同齡期水泥凈漿比較,尾礦-水泥硬化漿體一組水化產(chǎn)物以C-S-H為主,相對水泥凈漿組較少觀察到Ga(OH)2。根據(jù)膠凝材料基本理論及機(jī)械力化學(xué)活化尾礦性能,判斷尾礦-水泥漿體中發(fā)生了二次水化反應(yīng),
[Abstract]:In this paper, high silicon type iron tailings are selected as the research object (tailings originated from Qidashan Iron Mine, Anshan, Liaoning Province). The properties of the tailings are tested and analyzed, including the analysis of the chemical composition and mineral composition of the tailings. The results of particle size analysis and activity analysis show that the main chemical composition of the tailings is SiO2, the main mineral component is quartz, and the particle size is concentrated at 120 渭 m. No pozzolanic activity. Based on the basic principle of mechanochemistry, the tailings were milled by mechanical force. The particle size of the tailings was 12.231 渭 m 路XRD. The crystallization degree of SiO2 after grinding is obviously decreased and the pozzolanic property is qualified. The standard consistency water consumption is obtained by the composite cementing material composed of high silicon iron tailings and cement after mechanochemical activation. The initial and final setting time is similar to the standard consistency water consumption of cement, the initial and final setting time is close and the stability is qualified. The high silicon iron tailings activated by mechanochemistry are used as the concrete auxiliary cementing materials. The effect of the tailings on the mixing property and compressive strength of the concrete was studied by experiments, and the results showed that the content of tailings increased with the increase of the content of tailings. The slump of concrete mixture decreases, and the cohesion and water retention of concrete mixture increase with the increase of tailings content. The quantity of cement replaced by tailings is 20. The results of compressive strength test show that the strength of concrete decreases in varying degrees with the increase of the amount of cement replaced by tailings, and the amount of cement replaced by tailings is less than 30%. The compressive strength of concrete can be significantly improved by adding water reducer to meet the requirement of design strength C30. The design strength C30 can still be achieved when the content of cement replaced by tailings is 40. The phase and microcosmic analysis of cement hardened paste and tailings cement hardened paste are carried out by XRD and SEM, and the results show that. The strongest diffraction peaks of Ca(OH)2 in the same age period always appear in the cement paste group. At the same time, SEM showed that the surface of unreacted tailings was gradually covered by hydration products with the increase of age, which was compared with the cement paste of the same age. C-S-H is the main hydration product of tailings and cement hardened paste. Compared with the pure cement slurry group, there is less GaOH ~ (2). According to the basic theory of cementitious material and mechanochemical activation of tailings, the results are as follows: (1) the main hydration product of tailings is C-S-H. Judging that the secondary hydration reaction occurred in the tailings and cement paste,
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU528

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 阮炯正;;混凝土摻合料應(yīng)用和生產(chǎn)技術(shù)研究[J];建筑技術(shù);2012年01期

2 何錦云;毛明明;;C30再生粗骨料混凝土和易性和抗壓強(qiáng)度研究[J];河北工程大學(xué)學(xué)報(自然科學(xué)版);2011年04期

3 張旭賢;牛新平;黃磊;;粉煤灰對混凝土和易性和強(qiáng)度的影響[J];安徽農(nóng)業(yè)科學(xué);2011年36期

4 崔孝煒;倪文;吳輝;;水膠比對鐵尾礦混凝土強(qiáng)度的影響[J];金屬礦山;2011年11期

5 郭玉香;孫加林;曲殿利;王飛;;鐵尾礦對混凝土性能的影響[J];冶金能源;2011年05期

6 呂智英;;高效減水劑與粉煤灰對再生混凝土的和易性影響研究[J];商品混凝土;2011年07期

7 鄭永超;倪文;路國忠;魏浩;王海霞;;高硅鐵尾礦制備高強(qiáng)混凝土的實驗研究[J];建筑技術(shù);2011年04期

8 孟躍輝;倪文;張玉燕;;我國尾礦綜合利用發(fā)展現(xiàn)狀及前景[J];中國礦山工程;2010年05期

9 黃曉燕;倪文;祝麗萍;王中杰;;齊大山鐵尾礦粉磨特性[J];北京科技大學(xué)學(xué)報;2010年10期

10 王亮;黃偉;趙宏魁;;淺談混凝土和易性的控制[J];黑龍江交通科技;2010年09期

相關(guān)博士學(xué)位論文 前1條

1 李響;復(fù)合水泥基材料水化性能與漿體微觀結(jié)構(gòu)穩(wěn)定性[D];清華大學(xué);2010年

，

本文編號：1425467