本文選題：煤矸石 + 流動(dòng)性��； 參考：《沈陽建筑大學(xué)》2015年碩士論文

【摘要】：煤矸石是煤礦生產(chǎn)過程中采煤、洗煤時(shí)排放的工業(yè)廢渣。目前我國(guó)煤矸石累計(jì)堆存量已達(dá)50多億噸,占用了大量的土地,同時(shí),煤矸石自然過程中不斷排放有害氣體,嚴(yán)重污染環(huán)境。而利用煤矸石生產(chǎn)混凝土制品,替代混凝土中部分碎石,可以大量減少建筑行業(yè)對(duì)天然集料的的使用,具有較高的經(jīng)濟(jì)效益和社會(huì)效益。本課題以煤矸石作為粗集料,替代部分碎石制備摻煤矸石混凝土,系統(tǒng)研究煤矸石摻量、粉煤灰取代率、水膠比、減水劑摻量等因素對(duì)摻煤矸石混凝土流動(dòng)性、力學(xué)性能和收縮性能的影響規(guī)律。研究結(jié)果表明:隨著煤矸石摻量的增加,混凝土流動(dòng)性和力學(xué)性能明顯下降�；炷潦湛s是先增大后減小;隨著粉煤灰摻量的增加,混凝土的流動(dòng)性、力學(xué)性能和收縮性能均得到了明顯的改善。而粉煤灰對(duì)力學(xué)性能和收縮性能的影響主要發(fā)生在后期;隨著水膠比的增大,混凝土的流動(dòng)性增加,力學(xué)性能下降,而水膠比越小,混凝土的收縮越大;隨著減水劑摻量的增加,混凝土的流動(dòng)性和力學(xué)性能逐漸增加,而大摻量減水劑對(duì)混凝土的早期收縮有有很好的抑制作用,但是對(duì)后期收縮影響不利,故減水劑的摻量要控制在合理范圍之內(nèi);運(yùn)用正交分析和線性回歸分析,得出混凝土力學(xué)性能的最佳配合比為粉煤灰摻量為20%、水膠比為0.38、煤矸石摻量為30%,其中水膠比是影響混凝土強(qiáng)度的主要因素,煤矸石摻量次之,粉煤灰取代率影響最小,線性回歸方程為Y=99.65889+0.01728X1-124.25X2-0.01897X3�；炷潦湛s性能的最佳配合比為粉煤灰摻量為35%、水膠比為0.44、煤矸石摻量為55%、減水劑摻量為1.5%,其中水膠比是影響混凝土收縮應(yīng)變的主要因素,粉煤灰取代率次之,煤矸石摻量第三,減水劑摻量影響小,線性回歸方程為Y=738.20178-0.29528X1-1067.95X2+0.000978X3-0.18912X4。
[Abstract]:Coal gangue is the industrial residue discharged during coal mining and coal washing. At present, the accumulative storage of coal gangue in our country has reached more than 5 billion tons, occupying a large amount of land. At the same time, the natural process of coal gangue constantly releases harmful gas, which seriously pollutes the environment. The use of coal gangue to produce concrete products instead of some crushed stones in concrete can greatly reduce the use of natural aggregates in the construction industry and has higher economic and social benefits. In this paper, coal gangue is used as coarse aggregate instead of some crushed stone to prepare coal gangue concrete. The fluidity of coal gangue concrete is studied systematically, such as coal gangue content, fly ash substitution rate, water binder ratio and water reducing agent ratio, etc. The influence of mechanical properties and shrinkage properties. The results show that the fluidity and mechanical properties of concrete decrease obviously with the increase of coal gangue content. The shrinkage of concrete increases first and then decreases, and with the increase of fly ash content, the fluidity, mechanical properties and shrinkage properties of concrete are obviously improved. The effect of fly ash on the mechanical properties and shrinkage of concrete mainly occurs in the later stage, with the increase of water-binder ratio, the fluidity of concrete increases, the mechanical property decreases, and the smaller the water-binder ratio, the greater the shrinkage of concrete. With the increase of water reducing agent content, the fluidity and mechanical properties of concrete increase gradually. However, the large amount of water reducing agent has a good effect on the early shrinkage of concrete, but it is unfavorable to the late shrinkage. Therefore, the dosage of water reducer should be controlled within a reasonable range, and the orthogonal analysis and linear regression analysis should be used. It is concluded that the optimum mix ratio of concrete mechanical properties is fly ash 20, water binder 0.38, coal gangue 30. The water binder ratio is the main factor affecting the strength of concrete, the coal gangue content is the second, and the fly ash replacement ratio is the least. The linear regression equation is YT 99.65889 0.01728X1-124.25X2-0.01897X3. The optimum mixture ratio of concrete shrinkage performance is 35% fly ash, 0.44 water / binder ratio, 55 coal gangue content and 1.5 water reducing agent. The water binder ratio is the main factor affecting shrinkage strain of concrete, followed by the replacement rate of fly ash. The content of coal gangue was the third, and the content of water reducer had little influence. The linear regression equation was YC 738.20178-0.29528X1-1067.95X2 0.000978X3-0.18912X4.
【學(xué)位授予單位】：沈陽建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU528

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