【摘要】：我國(guó)是以煤炭為主要能源的國(guó)家,煤炭開采產(chǎn)生的煤矸石是最大宗的工業(yè)固體廢棄物,其對(duì)環(huán)境造成的污染引起了人們的廣泛關(guān)注。因此,煤矸石減量化、資源化和規(guī)�；闷仍诿冀�。煤矸石的組成和性質(zhì)決定了在建材領(lǐng)域應(yīng)用的可能性,而煤矸石在建材領(lǐng)域的資源化利用,是規(guī)�；{煤矸石的最佳途徑。本課題是國(guó)家自然科學(xué)基金委員會(huì)與神華集團(tuán)有限公司聯(lián)合資助項(xiàng)目—“煤矸石在水泥和混凝土中資源化利用關(guān)鍵科學(xué)問(wèn)題研究”(U1261122)的子項(xiàng)目,取得的所有研究成果都是在該基金的資助下完成的。課題采用現(xiàn)場(chǎng)調(diào)研及取樣、試驗(yàn)研究和理論分析等綜合方法,通過(guò)單因素對(duì)比試驗(yàn)、正交試驗(yàn),研究自燃煤矸石粗集料的預(yù)處理、復(fù)摻礦物摻合料等對(duì)自燃煤矸石砂輕混凝土性能的影響及規(guī)律,試圖解決自燃煤矸石粗集料混凝土廣泛應(yīng)用的瓶頸問(wèn)題,取得以下主要研究成果：自燃煤矸石粗集料的吸水速度較快,20min可以達(dá)到飽和吸水率的95%;吸水速度隨吸水時(shí)間的延長(zhǎng)而變化,大致可分為三個(gè)階段,建立了自燃煤矸石粗集料吸水量與吸水時(shí)間之間的定量關(guān)系式。當(dāng)自燃煤矸石粗集料附加水為吸水率的80%,且提前1h吮水潤(rùn)濕,自燃煤矸石砂輕混凝土在保證強(qiáng)度等級(jí)要求的前提下,能實(shí)現(xiàn)預(yù)拌混凝土的大流動(dòng)性配制要求。正交試驗(yàn)結(jié)果顯示,硅灰摻量對(duì)自燃煤矸石砂輕混凝土拌合物工作性、硬化強(qiáng)度以及抗氯離子滲透等性能影響都特別顯著。但當(dāng)摻量較小時(shí),對(duì)混凝土抗凍性能影響不顯著；粉煤灰摻量對(duì)拌合物的工作性、抗凍性能的影響特別顯著,對(duì)28d抗壓強(qiáng)度影響顯著,對(duì)抗氯離子滲透的影響不顯著。
[Abstract]:The coal gangue produced by coal mining is the largest industrial solid waste in China, and its pollution to the environment has aroused widespread concern. Therefore, it is urgent to reduce coal gangue, resource utilization and large-scale utilization. The composition and properties of coal gangue determine the possibility of application in the field of building materials, and the resource utilization of coal gangue in the field of building materials is the best way to absorb coal gangue on a large scale. This project is a sub-project of "Research on key Scientific problems of Resource Utilization of Coal gangue in cement and concrete" (U1261122), which is jointly supported by the National Natural Science Foundation of China and Shenhua Group Co., Ltd. All the research results achieved have been completed with the support of the Fund. In this paper, field investigation and sampling, experimental research and theoretical analysis are adopted to study the pretreatment of coarse aggregate of coal-fired gangue through single factor contrast test and orthogonal test. The influence of mineral admixture on the performance of self-combustion gangue sand lightweight concrete and so on, in order to solve the bottleneck problem of the wide application of coal-fired gangue coarse aggregate concrete. The main research results are as follows: the water absorption rate of coarse aggregate from coal-fired gangue is faster, and 20min can reach 95% of saturated water absorption rate; The water absorption rate varies with the increase of water absorption time and can be divided into three stages. The quantitative relationship between water absorption and water absorption time of coal-fired gangue coarse aggregate is established. When the additional water of the coarse aggregate of self-fired gangue is 80% of the water absorption rate and the moisture is sucked 1 hour in advance, the self-burning gangue sand light concrete can meet the requirement of large mobility of ready-mixed concrete under the premise of ensuring the strength grade. The results of orthogonal test show that the content of silica fume has a significant effect on the workability, hardening strength and chloride ion penetration resistance of spontaneous combustion gangue sand light concrete mixture. However, when the content of fly ash is small, it has no significant effect on the frost resistance of concrete, but the content of fly ash has a significant effect on the workability and frost resistance of the mixture, but has a significant effect on the compressive strength of 28 days, but has no significant effect on chloride ion penetration.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU528

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本文編號(hào)：2474081