本文選題：硅質(zhì)鐵尾礦粉 + 混凝土摻合料�。� 參考：《清華大學》2013年碩士論文

【摘要】：硅質(zhì)鐵尾礦是鐵礦開采過程中排出的廢料，可造成環(huán)境污染。以硅質(zhì)鐵尾礦為基材進行磨細加工，達到一定細度可制備粉體材料--硅質(zhì)鐵尾礦粉。本文研究硅質(zhì)鐵尾礦粉作為混凝土摻合料的可行性以及其對混凝土性能的影響，，試圖開發(fā)新品種混凝土摻合料，探索硅質(zhì)鐵尾礦資源化應用的新途徑。 本文進行了硅質(zhì)鐵尾礦的礦物組成、化學成分和易磨性等材料特性試驗研究；不同細度硅質(zhì)鐵尾礦粉的活性指數(shù)以及和粉煤灰、礦渣粉不同比例復合的活性指數(shù)試驗研究；不同水膠比、不同摻量和不同復合比例的混凝土強度試驗研究；摻硅質(zhì)鐵尾礦粉的混凝土的拌合物性能、力學性能、耐久性能和體積穩(wěn)定性的試驗研究。并選擇合適的工程進行了實際應用。得出如下結論： 1、本次研究的鐵尾礦屬典型的高硅鞍山型鐵尾礦，其易磨性指數(shù)高于水泥熟料，與礦渣或鋼渣相當。 2、比表面積400m~2/kg以上的硅質(zhì)鐵尾礦粉具有微弱水硬性，但不具備火山灰性。硅質(zhì)鐵尾礦粉的活性指數(shù)低于礦渣粉和粉煤灰。摻加比例相同時，硅質(zhì)鐵尾礦粉與礦渣粉復合后的活性指數(shù)高于其與粉煤灰復合后的活性指數(shù)，細度對其活性指數(shù)的影響不顯著。與粉煤灰復合相比，硅質(zhì)鐵尾礦粉與礦渣粉復合有利于其活性的發(fā)揮。 3、比較不同水膠比、不同摻合料摻量和不同復合比例的硅質(zhì)鐵尾礦粉與礦渣粉復合雙摻混凝土的抗壓強度規(guī)律時發(fā)現(xiàn)，隨著復合摻合料摻量的增加，同齡期混凝土早期強度逐漸減低，但后期強度增幅明顯。隨水膠比的降低，同齡期混凝土單位強度貢獻率增大；低水膠比條件下更有利于摻合料活性的發(fā)揮。 4、硅質(zhì)鐵尾礦粉與礦渣粉復合雙摻后，改善了混凝土的工作性能、力學性能和耐久性能，并能減少混凝土收縮，硅質(zhì)鐵尾礦粉的細度對混凝土的力學性能影響不顯著。 5、加強硅質(zhì)鐵尾礦的選材，粉磨、運輸、應用等各環(huán)節(jié)的質(zhì)量控制，采用合理的配合比，達到一定細度的硅質(zhì)鐵尾礦粉作為混凝土摻合料，已在實際工程中應用，混凝土的拌合物性能和硬化混凝土性能均能滿足設計要求。
[Abstract]:Siliceous iron tailings are wastes discharged during iron ore mining, which can cause environmental pollution. The siliceous iron tailings can be prepared by grinding the siliceous iron tailings to a certain degree of fineness. In this paper, the feasibility of siliceous iron tailings as concrete admixture and its influence on concrete properties are studied. A new kind of concrete admixture is developed, and a new approach to the application of siliceous iron tailings is explored. In this paper, the mineral composition, chemical composition and grindability of siliceous iron tailings were studied, and the activity index of siliceous iron tailings with different fineness and different ratio of fly ash and slag powder were studied. Experimental study on the strength of concrete with different water / binder ratio, different content and different composite ratio, and experimental study on the mixing properties, mechanical properties, durability and volume stability of concrete mixed with siliceous iron tailing powder. The suitable project is selected for practical application. The following conclusions are drawn: 1. The iron tailings studied in this paper are typical high silicon Anshan iron tailings, and their grindability index is higher than that of cement clinker, which is equivalent to slag or steel slag. 2. The siliceous iron tailings with specific surface area above 400m~2/kg have weak hydrohardness but no pozzolanic property. The activity index of siliceous iron tailings is lower than that of slag and fly ash. The activity index of siliceous iron tailings mixed with slag powder was higher than that of fly ash when the ratio was the same, but the fineness had no significant effect on the activity index. Compared with fly ash, the combination of siliceous iron tailings and slag powder is beneficial to its activity. 3. When comparing the compressive strength law of the concrete with different water / binder ratio, different admixture content and different compound ratio, it is found that with the increase of the amount of the compound admixture, the compressive strength of the concrete mixed with the siliceous iron tailing powder and the slag powder is increased. The early strength of concrete of the same age period decreases gradually, but the increase of later stage strength is obvious. With the decrease of water-binder ratio, the contribution rate of concrete per unit strength increases at the same age, and the low water-binder ratio is more favorable for the exertion of admixture activity. 4. After the compound addition of siliceous iron tailing powder and slag powder, the working performance, mechanical property and durability of concrete are improved, and the shrinkage of concrete is reduced. The fineness of siliceous iron tailings powder has no significant effect on the mechanical properties of concrete. (5) strengthening the quality control of the selection, grinding, transportation and application of siliceous iron tailings, adopting reasonable mix ratio and achieving certain fineness of siliceous iron tailings as concrete admixtures, has been applied in practical projects. The performance of concrete mixture and hardened concrete can meet the design requirements.
【學位授予單位】：清華大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU528.041

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