双螺旋轴搅拌机搅拌高强混凝土的搅拌工艺研究

发布时间：2019-05-23 03:13

【摘要】：双卧轴搅拌机存在混凝土容易抱轴结块、搅拌低效区、料流运动不畅等问题，严重地影响了搅拌设备的作业质量和效率。为了解决这些问题，新型的双螺旋轴搅拌机在双螺带搅拌机的基础上，去除中间搅拌臂，只保留两边搅拌臂，用两个半轴代替横通的搅拌轴，添加中间连接块，形成了特殊的“无轴”搅拌结构，不会产生混凝土的结块抱轴现象，混凝土投放量增大，物料的运动较为流畅。本文利用设计的双螺旋轴搅拌机试验样机，研究了双螺旋搅拌机搅拌C60高强混凝土时，采用一次投料法、先拌水泥砂浆法和水泥裹砂石法三种不同搅拌工艺对混凝土性能的影响，在理论分析和实验研究的基础上，确定不同搅拌工艺下的较佳参数，并通过对比分析得出较优的搅拌工艺。结果表明，与其它两种搅拌工艺相比，采用先拌水泥砂浆法搅拌C60高强混凝土时，能有效改善混凝土界面过渡区结构，提高混凝土的强度和均匀性，同时可以减少搅拌时间，降低能耗，提高生产率。为了进一步确定双螺旋轴搅拌机搅拌C60高强混凝土的可行性及搅拌质量，进行了双螺旋轴搅拌机与不同机型对比试验。对比试验结果表明：三种不同搅拌工艺下，双螺旋轴搅拌机搅拌出的C60高强混凝土具有较低的混凝土含气量；采用一次投料法和先拌水泥砂浆法时，双螺旋轴搅拌机搅拌出的混凝土具有更好的匀质性，搅拌过程更节能、高效；采用水泥裹砂石法时，叶片带孔的双卧轴搅拌机搅拌质量与双螺旋轴搅拌机不相上下。考虑到实际生产条件，建议使用双螺旋轴搅拌C60高强混凝土，并采用先拌水泥砂浆法。
[Abstract]:There are some problems in double horizontal shaft mixer, such as easy caking of concrete, low efficiency zone of mixing, poor movement of material flow and so on, which seriously affect the working quality and efficiency of mixing equipment. In order to solve these problems, the new double spiral shaft mixer, on the basis of the double screw belt mixer, removes the middle mixing arm, preserves only the two sides of the mixing arm, replaces the transverse mixing shaft with two half shafts, and adds the intermediate connecting block. A special "shaft-free" mixing structure is formed, which does not produce the phenomenon of caking and holding the shaft of concrete, the amount of concrete is increased, and the movement of materials is more smooth. In this paper, the single feeding method is studied when the C60 high strength concrete is mixed with the double spiral mixer by using the designed experimental prototype of the double spiral shaft mixer. On the basis of theoretical analysis and experimental study, the better parameters under different mixing processes are determined on the basis of theoretical analysis and experimental research on the effects of three different mixing processes on the performance of concrete. Through comparative analysis, the better mixing process is obtained. The results show that compared with the other two mixing processes, when C60 high strength concrete is mixed with cement mortar method, the structure of interface transition zone can be effectively improved, the strength and uniformity of concrete can be improved, and the mixing time can be reduced at the same time. Reduce energy consumption and improve productivity. In order to further determine the feasibility and mixing quality of C60 high strength concrete mixed with double spiral shaft mixer, the comparative test between double spiral shaft mixer and different models was carried out. The comparative test results show that the C60 high strength concrete mixed with double spiral shaft mixer has lower gas content of concrete under three different mixing processes. When the primary feeding method and the first mixing cement mortar method are used, the concrete mixed by the double spiral shaft mixer has better homogeneity, and the mixing process is more energy-saving and efficient. When cement sand wrapping method is used, the mixing quality of double horizontal shaft mixer with holes is as good as that of double spiral shaft mixer. Considering the actual production conditions, it is suggested that C60 high strength concrete should be mixed with double spiral shafts and cement mortar method should be adopted.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU755

【参考文献】