本文選題：鐵尾礦微粉 + 混凝土　； 參考：《北京建筑大學》2015年碩士論文

【摘要】：在鐵礦石開采過程中,產(chǎn)生了大量尾礦固體廢棄物,大量堆積不僅占用土地,污染環(huán)境,破壞生態(tài),而且構成安全威脅。當前,我國鐵尾礦的利用率還很低,急需尋求大量處理和利用的新途徑。另一方面,我國混凝土用量巨大,2014年用量在70億立方米以上,礦物摻和料每年需求量保守講應該在8億噸以上。由于粉煤灰、礦渣等工業(yè)廢渣資源的分布不均勻,火力發(fā)電廠逐漸減少,粉煤灰等廢渣產(chǎn)出量減少等原因,南方許多地區(qū)出現(xiàn)常規(guī)摻和料供應不足的情況,客觀上需要開發(fā)新型摻和料進行補充。鐵尾礦顆粒大多屬于特細砂范疇,只有少量可以作為機制砂來利用。將鐵尾礦磨細成微粉作為礦物摻和料在混凝土中利用,既可以緩解部分地區(qū)傳統(tǒng)摻和料供應緊張的問題,又可以大規(guī)模消納尾礦廢棄物,有可觀的經(jīng)濟和環(huán)境效益。本文主要研究磨細鐵尾礦微粉作為混凝土礦物摻和料的適用性,明確鐵尾礦微粉的技術要求及其對混凝土各性能的影響,以期形成鐵尾礦微粉混凝土的應用技術要點,推進鐵尾礦微粉在混凝土工程領域的廣泛應用。課題針對鐵尾礦微粉適宜的技術指標、在混凝土中合適的摻量、和易性、強度和耐久性等方面進行了系統(tǒng)研究,并通過掃描電鏡試驗,探討分析微觀組織結構和微粉上浮問題。結果表明:鐵尾礦微粉細度控制在500m2/kg,亞甲藍值低于1.0時,鐵尾礦微粉與礦渣粉復摻比例在5:5至6:4范圍,復合摻和料在膠凝材料中摻量不超過40%時,鐵尾礦微粉摻入混凝土中,具有良好的和易性,強度滿足混凝土等級要求,對耐久性影響與粉煤灰相當。鐵尾礦微粉顆粒均勻分布于漿體中,抗上浮能力明顯優(yōu)于粉煤灰,耐磨性能優(yōu)良。課題研究證明鐵尾礦微粉作為混凝土摻和料使用具有技術可行性。
[Abstract]:In the process of iron ore mining, a large number of solid waste tailings are produced, which not only occupy the land, pollute the environment, destroy the ecology, but also pose a security threat. At present, the utilization rate of iron tailings in China is still very low. On the other hand, the amount of concrete in our country is huge, the consumption in 2014 is more than 7 billion cubic meters, the demand for mineral admixture should be more than 800 million tons per year. Due to the uneven distribution of industrial waste slag resources such as fly ash and slag, the gradual decrease in thermal power plants and the decrease in the output of waste slag such as fly ash, there has been a lack of supply of conventional admixture in many areas of southern China. Objectively, it is necessary to develop new admixture to supplement it. Iron tailings mostly belong to the category of ultrafine sand, only a few can be used as mechanism sand. The use of iron tailings as mineral admixture in concrete can not only alleviate the shortage of traditional admixture in some areas, but also absorb tailings waste on a large scale, with considerable economic and environmental benefits. This paper mainly studies the applicability of fine iron tailings as concrete mineral admixture, and clarifies the technical requirements of iron tailings and its influence on concrete properties, in order to form the main technical points of application of iron tailings fine powder concrete. Promote the wide application of iron tailings powder in concrete engineering field. Aiming at the appropriate technical index of iron tailings powder, this paper makes a systematic study on the appropriate content, ease, strength and durability of concrete, and analyzes the microstructure and floatation of fine powder by SEM test. The results show that when the fineness of iron tailings is controlled at 500m2 / kg, the methylene blue value is lower than 1.0, the ratio of iron tailings powder to slag powder is between 5:5 and 6:4, and when the amount of compound admixture is not more than 40%, the iron tailings fine powder is mixed into concrete. It has good and easiness, the strength meets the requirement of concrete grade, and the effect on durability is equal to that of fly ash. Iron tailings particles distribute evenly in the slurry, and the anti-floating ability is obviously better than that of fly ash, and the wear resistance of iron tailings is excellent. The technical feasibility of using iron tailings as concrete admixture is proved.
【學位授予單位】：北京建筑大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU528

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