矿粉的胶凝活性及其对混凝土氯离子渗透性的影响

发布时间：2018-03-05 12:01

  本文选题：矿粉　切入点：胶凝活性　出处：《安徽建筑大学》2016年硕士论文　论文类型：学位论文

【摘要】：矿粉与水泥有着相似的化学组成,具有潜在活性,是绿色环保、价格低廉的建筑材料之一。用矿粉替代水泥,可降低混凝土生产成本,减少水泥生产所带来的污染。本课题系统研究了矿粉掺量分别为40%、50%、60%的水泥-矿粉胶凝体系的活性以及高掺矿粉混凝土的氯离子渗透性。分别采用掺加复合激发剂Na2CO3和Na2SO4以及提高养护温度两种方式来激发水泥-矿粉胶凝体系的活性,同时研究了高掺矿粉混凝土在不同条件下的强度以及抗氯离子渗透性,并分析了高掺矿粉混凝土的微观结构,主要研究内容如下:通过水泥-矿粉胶砂强度来间接评价胶凝体系的活性,确定复合激发剂Na2CO3和Na2SO4最佳配比为1:1,最佳掺量为3%。复合激发剂Na2CO3和Na2SO4可以提高抗折强度,从而改善砂浆的韧性。分别研究了养护温度为20℃、30℃、40℃对矿粉活性的激发效果,结果发现最优的养护温度为30℃,且养护温度为30℃时的活性激发效果优于掺加复合激发剂的活性激发效果。通过测试不同条件下的高掺矿粉混凝土立方体抗压强度以及电通量试验,发现养护温度为30℃且不添加激发剂的条件下,混凝土的抗压强度几乎没有损失,并且抗氯离子渗透性较好;添加复合激发剂Na2CO3和Na2SO4能提高高掺矿粉混凝土的抗氯离子渗透性能。采用Rapid Air457气孔结构分析仪研究了高掺矿粉混凝土的微观结构,发现与不掺矿粉的混凝土相比,掺矿粉混凝土内部封闭气孔含量相对较多,且孔隙之间间距较大。同时发现,高掺矿粉混凝土的孔隙率及孔隙间距系数均与抗压强度存在一定的相关性。
[Abstract]:Mineral powder and cement have similar chemical composition, potential activity, is one of the green and low cost building materials. Replacing cement with mineral powder can reduce the production cost of concrete. In order to reduce the pollution caused by cement production, the activity of cementitious cementitious system with 40% mineral powder and the chloride ion permeability of concrete with high mineral powder content of 40% and 50% respectively were studied systematically in this paper. Na2CO3 and Na2SO4 and raising curing temperature are two ways to stimulate the activity of cement-mineral powder cementitious system. At the same time, the strength and resistance to chloride ion permeability of high mineral powder concrete under different conditions are studied, and the microstructure of high mineral powder concrete is analyzed. The main research contents are as follows: the activity of cementing system is indirectly evaluated by the strength of cement and mineral powder cement sand, the optimum ratio of Na2CO3 and Na2SO4 is 1: 1, the optimum dosage is 3. The composite activator Na2CO3 and Na2SO4 can improve the flexural strength. In order to improve the toughness of mortar, the activation effect of curing temperature of 20 鈩，

本文编号：1570149