拜耳法赤泥的添加对混凝土性能 影响的研究.docVIP

拜耳法赤泥的添加对混凝土性能 影响的研究 作者： 王志开 学号： 200804030 指导教师： 李绍纯 赤泥对混凝土性能的影响研究 摘要 赤泥是制铝工业提取氧化铝时排出的污染性废渣,一般平均每生产1t氧化铝，附带产生1.0-2.0t的赤泥。我国作为世界第4大氧化铝生产国，每年排放的赤泥高达数百万吨。另外， 本课题的主要目的是研究混凝土内掺赤泥以及赤泥的掺量对混凝土性能的影响初步掌握赤泥与混凝土之间的相互作用机理，并熟练进行配方设计与实验研究，掌握对混凝土各种性能的测试方法。试验选用赤泥为水洗法脱碱后赤泥，混凝土的水灰比为0.4，经内掺养护处理后，测试混凝土的抗压强度、抗折强度以及其物相结构和微观结构分析，通过试验分析赤泥掺量对混凝土性能的影响。 结果表明，最经济可行的水洗脱碱工艺参数为：在室温下，液固比为5:1，浸泡时间1天，洗涤次数5次以上； 三种钙化物的用量在置换赤泥中的Na+中存在最大值，且随着反应时间的延长，钙离子置换法中的反应会持续进行下去，置换出结合碱中的钠。加入赤泥后，促进了水泥基材料的水化进程，使混凝土材料的7d抗压强度提高10MPa～13MPa,达到28d强度的90%；7d抗折强度提高2.81MPa,之后不再随养护龄期变化。另外，赤泥的对混凝土微观结构的影响不明显。 Abstract Red mud is the polluting waste residue of extraction of alumina at the aluminum industry, the general average production of 1t of alumina, produced 1.0-2.0t with red mud. China as the worlds fourth-largest alumina producer, its annual emissions of red mud is up to millions of tons. In addition, the red mud contains large amounts of CaO, SiO2, Al2O3, Fe2O3 and other alkaline oxides, but also makes a lot of red mud that can not be fully effective use, rely on a large area of the yard piled up a lot of land, also caused serious environmental pollution. Therefore, it has important significance to research the red mud. The main aims of this project are to investigate the study of concrete with red mud and the performance of red mud content on concrete , to preliminary master the concrete mechanism of interaction between each other, And master the formulation design and experimental studies skillfully, master of the concrete performance test methods. Test selection of red mud was the red mud that off the alkali by washing method. The water-cement ratio of Concrete 0.4 have been selected, After processing of the within-doped conservation, to test the concrete compressive strength, flexural strength, and its phase structure and microstructure analysis, to analysis of the properties of concrete contented on red mud through the test. The results showed that The most economical and feasi