本文選題：鐵尾礦 + 廢石��； 參考：《北京科技大學》2015年博士論文

【摘要】：為了開發(fā)大宗工業(yè)固體廢棄物資源化利用的新途徑,滿足社會對綠色、高性能、高耐久性建筑材料的需求以及推動混凝土行業(yè)的可持續(xù)發(fā)展,本文以精細化綜合利用為目標,采用鐵尾礦和廢石為主要原料依次研發(fā)出三種新型綠色高性能混凝土：鐵尾礦細骨料混凝土、全尾礦廢石骨料高性能混凝土和極細鐵尾礦粉混凝土。 全部利用鐵尾礦砂作為骨料制備出標準養(yǎng)護條件下28d抗壓強度達到100MPa的鐵尾礦細骨料混凝土,固廢總利用率達到89.2%。鐵尾礦細骨料混凝土最優(yōu)配合比為：鐵尾礦比例占60%,粉煤灰比例占12%,礦渣比例占14%,水泥熟料比例占10.8%,脫硫石膏比例占3.2%,PC高效減水劑用量為膠凝材料的0.23%,水膠比0.22。 在鐵尾礦細骨料混凝土基礎上加入廢石作為粗骨料,制備出塌落度為136mmm,標準養(yǎng)護條件下28d抗壓強度達98.54MPa的全尾礦廢石骨料混凝土,其尾礦廢石摻量達到72%,水泥熟料摻量僅為7.56%,固廢總利用率達到92.44%,并且其在抗凍融和抗硫酸鹽侵蝕等耐久性方面具有優(yōu)異的性能。通過XRD、XPS、IR、SEM, TG-DSC、水化放熱規(guī)律和孔結構測試等分析手段可知,水化各齡期C-S-H凝膠和鈣礬石是強度的主要來源。 在全尾礦廢石骨料混凝土的基礎上,采用目前難以利用的極細鐵尾礦粉作為礦物摻合料,制備出在標準養(yǎng)護條件下28d抗壓強度為88.99MPa的極細鐵尾礦粉混凝土,尾礦廢石利用率達77.6%。并對極細鐵尾礦中所含有的石英、鈉長石、拉長石、綠泥石和黑云母五種主要礦物成分進行水化反應活性的研究,結果表明標準養(yǎng)護條件下石英、綠泥石和黑云母反應活性較低,而鈉長石和拉長石反應活性較高,其水化產(chǎn)物主要為鈣礬石類礦物,對水化硬化漿體的強度有所貢獻。 將鐵尾礦和廢石等工業(yè)固體廢棄物應用于高性能混凝土的研發(fā)中,不僅可以降低尾礦廢石等固廢對環(huán)境造成的負面影響,還能減少高性能混凝土原材料的碳足跡,并且提高產(chǎn)品附加值,從而有利于整個行業(yè)的可持續(xù)發(fā)展。
[Abstract]:In order to develop a new way of recycling industrial solid wastes, meet the needs of the society for green, high performance and high durability building materials and promote the sustainable development of concrete industry, this paper aims at fine and comprehensive utilization. Three new types of green high performance concrete were developed by using iron tailings and waste rock as main raw materials: iron tailings fine aggregate concrete, whole tailings waste aggregate high performance concrete and very fine iron tailings powder concrete. Iron tailings fine aggregate concrete with 28d compressive strength up to 100MPa was prepared by using iron tailings as aggregate, and the total utilization ratio of solid waste reached 89.2%. The optimum mix ratio of fine aggregate concrete of iron tailings is 60% of iron tailings, 12% of fly ash, 14% of slag, 10.8 of cement clinker, and 3.2% of desulphurization gypsum. The content of PC superplasticizer is 0.23 and the ratio of water to glue is 0.22. On the basis of iron tailings fine aggregate concrete, waste stone as coarse aggregate was added to prepare the whole tailings waste aggregate concrete with collapse degree of 136mm and compressive strength of 98.54MPa for 28d under standard curing conditions. The content of tailings is 72%, cement clinker is only 7.56, the total utilization ratio of solid waste is 92.44%, and it has excellent durability in the aspects of anti-freezing and anti-sulfate erosion. Through the analysis of XRDX, TG-DSC, hydration exothermic law and pore structure test, it can be seen that C-S-H gel and ettringite are the main sources of strength in different hydration stages. On the basis of total tailings waste aggregate concrete, the extremely fine iron tailings concrete, which is difficult to be used at present as mineral admixture, is prepared under the standard curing conditions with compressive strength of 88.99MPa for 28 days. The utilization ratio of tailings waste rock reaches 77.6%. The hydration activity of quartz, albite, elongite, chlorite and biotite in ultrafine iron tailings was studied. The reaction activity of chlorite and biotite is low, while the reaction activity of albite and elongate is higher. The hydration product is mainly ettringite mineral, which contributes to the strength of hydrated hardened slurry. The application of industrial solid waste such as iron tailings and waste stones in the research and development of high performance concrete can not only reduce the negative impact of solid waste such as tailings on the environment, but also reduce the carbon footprint of raw materials of high performance concrete. And improve the added value of products, which is conducive to the sustainable development of the entire industry.
【學位授予單位】：北京科技大學
【學位級別】：博士
【學位授予年份】：2015
【分類號】：TU528

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本文編號：1882297