再生微粉资源化利用试验研究

发布时间：2018-04-30 18:54

  本文选题：再生微粉 + 发泡混凝土　； 参考：《青岛理工大学》2015年硕士论文

【摘要】：近年来,农镇城市化进程的不断加速,改扩建和拆迁工程不断产生大量的建筑垃圾,建筑垃圾围城现象时有发生。建筑垃圾资源化利用不仅可以解决环境问题,还可以有效减少建筑业对矿产资源的消耗。建筑垃圾制备再生骨料过程中不可避免地会产生大量的粉体材料—再生微粉,如不对其加以利用,必会造成资源浪费和产生二次污染,该材料的高效资源化利用已成为工程界急需解决的问题。本论文在国家自然科学基金(51378270)资助下,以拆除建筑垃圾通过颗粒整形工艺制备高品质再生骨料过程中产生的再生粉体为研究对象,探索其高效资源化利用途径。主要研究内容包括:再生微粉基本性能与活性研究、再生微粉用于制备发泡混凝土研究、再生微粉用于制备发泡水泥研究、再生微粉用于制备砌筑砂浆和抹灰砂浆试验研究等。研究结果表明:1、再生微粉的密度小,粒形不规则,质地疏松,内部含有大量孔隙,SiO2含量相对较高,火山灰活性略低于粉煤灰,可作为辅助胶凝材料使用。2、利用60%普通硅酸盐水泥+40%粉煤灰为基准胶凝材料,研究了多种因素对发泡混凝土性能的影响规律。结果表明,再生微粉取代率≤30%、水温控制(32±2)℃、发泡剂掺量为3~3.5%和稳泡剂掺量1%时,发泡混凝土的发泡速度适宜、气泡均匀、性能较好,同时,可以制备B04和B05等级的地暖保温制品。3、利用80%硫铝酸盐水泥+20%粉煤灰为基准胶凝材料,研究了多种因素对发泡水泥性能的影响规律。在发泡剂、稳泡剂和激发剂的掺量分别为胶凝材料总量的4.0%~4.5%、1.0%和0.33%,温度为(32±2)℃,水胶比为0.45~0.55,再生微粉的掺量占胶凝材料总量的10%、15%、20%和25%时,发泡水泥的干表观密度≤300kg/m3,抗压强度≥0.4MPa,均满足Ⅱ型保温板的技术要求。4、利用再生微粉替代水泥制备再生砂浆,掺量为10%、20%和30%,胶砂比为1:3、1:4、1:5和1:6,可制备强度等级为M10~M20的砌筑砂浆和M15~M30的抹灰砂浆,均满足规范要求。
[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，

本文编号：1825765