本文選題：再生微粉 + 發(fā)泡混凝土��； 參考：《青島理工大學(xué)》2015年碩士論文

【摘要】：近年來,農(nóng)鎮(zhèn)城市化進(jìn)程的不斷加速,改擴建和拆遷工程不斷產(chǎn)生大量的建筑垃圾,建筑垃圾圍城現(xiàn)象時有發(fā)生。建筑垃圾資源化利用不僅可以解決環(huán)境問題,還可以有效減少建筑業(yè)對礦產(chǎn)資源的消耗。建筑垃圾制備再生骨料過程中不可避免地會產(chǎn)生大量的粉體材料—再生微粉,如不對其加以利用,必會造成資源浪費和產(chǎn)生二次污染,該材料的高效資源化利用已成為工程界急需解決的問題。本論文在國家自然科學(xué)基金(51378270)資助下,以拆除建筑垃圾通過顆粒整形工藝制備高品質(zhì)再生骨料過程中產(chǎn)生的再生粉體為研究對象,探索其高效資源化利用途徑。主要研究內(nèi)容包括:再生微粉基本性能與活性研究、再生微粉用于制備發(fā)泡混凝土研究、再生微粉用于制備發(fā)泡水泥研究、再生微粉用于制備砌筑砂漿和抹灰砂漿試驗研究等。研究結(jié)果表明:1、再生微粉的密度小,粒形不規(guī)則,質(zhì)地疏松,內(nèi)部含有大量孔隙,SiO2含量相對較高,火山灰活性略低于粉煤灰,可作為輔助膠凝材料使用。2、利用60%普通硅酸鹽水泥+40%粉煤灰為基準(zhǔn)膠凝材料,研究了多種因素對發(fā)泡混凝土性能的影響規(guī)律。結(jié)果表明,再生微粉取代率≤30%、水溫控制(32±2)℃、發(fā)泡劑摻量為3~3.5%和穩(wěn)泡劑摻量1%時,發(fā)泡混凝土的發(fā)泡速度適宜、氣泡均勻、性能較好,同時,可以制備B04和B05等級的地暖保溫制品。3、利用80%硫鋁酸鹽水泥+20%粉煤灰為基準(zhǔn)膠凝材料,研究了多種因素對發(fā)泡水泥性能的影響規(guī)律。在發(fā)泡劑、穩(wěn)泡劑和激發(fā)劑的摻量分別為膠凝材料總量的4.0%~4.5%、1.0%和0.33%,溫度為(32±2)℃,水膠比為0.45~0.55,再生微粉的摻量占膠凝材料總量的10%、15%、20%和25%時,發(fā)泡水泥的干表觀密度≤300kg/m3,抗壓強度≥0.4MPa,均滿足Ⅱ型保溫板的技術(shù)要求。4、利用再生微粉替代水泥制備再生砂漿,摻量為10%、20%和30%,膠砂比為1:3、1:4、1:5和1:6,可制備強度等級為M10~M20的砌筑砂漿和M15~M30的抹灰砂漿,均滿足規(guī)范要求。
[Abstract]:In recent years, the process of urbanization of rural towns has been accelerating, construction garbage has been produced in the reconstruction, extension and demolition projects, and the phenomenon of building waste besieging cities has occurred from time to time. The utilization of construction waste can not only solve the environmental problems, but also reduce the consumption of mineral resources in the construction industry. In the process of preparing recycled aggregate from construction waste, a large number of powder materials are inevitably produced. If they are not used, they will lead to waste of resources and secondary pollution. The efficient utilization of this material has become an urgent problem in engineering field. In this paper, with the aid of the National Natural Science Foundation of China 51378270, the recycled powder produced in the process of preparing high quality recycled aggregate from demolition construction waste through particle shaping process was studied as the object of study, and the way of its efficient utilization was explored. The main research contents are as follows: the basic properties and activities of the regenerated micro-powder, the research on the preparation of foamed concrete by the regenerated micro-powder, the research on the preparation of foamed cement by the regenerated micro-powder, and the experimental study on the preparation of masonry mortar and plastering mortar by the regenerated micro-powder. The results show that the regenerated micro-powder has small density, irregular grain shape, loose texture, relatively high content of pore and Sio _ 2, and lower pozzolanic activity than fly ash. It can be used as auxiliary cementing material. The influence of various factors on the properties of foamed concrete is studied by using 60% ordinary Portland cement 40% fly ash as the benchmark cementitious material. The results show that when the substitution rate of regenerated micro-powder is 鈮，

本文編號：1825765