Influence of number and arrangement pattern of reversing blade on mixing uniformity of concrete(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2016年04期
- Page:
- 103-110
- Research Field:
- 汽车与机械工程
- Publishing date:
Info
- Title:
- Influence of number and arrangement pattern of reversing blade on mixing uniformity of concrete
- Author(s):
- ZHAO Li-jun; YU Zhi-long; XU Peng-jie; DING Wei-wei
- (Key Laboratory of Highway Construction Technology and Equipment of Ministry of Education, Chang’an University, Xi’an 710064, Shaanxi, China)
- Keywords:
- mechanical engineering; twin-shaft mixer; reversing blade; blade number; arrangement pattern; mixing uniformity
- PACS:
- U415.222
- DOI:
- -
- Abstract:
- In order to improve the mixing uniformity of concrete mixture for twin-shaft mixer, influence of the number of reversing blade, continuous and discontinuous arrangement of multi reversing blade under the constant number of mixing blades on circulation of the mixture movement in mixer were analyzed. Through mixing performance experiments of four different length-width ratio of mixer trough (0.8 and 0.9 for short-wide mixer trough, 1.1 and 1.2 for long-narrow mixer trough) under the same conditions of concrete composition, mixing procedure and mixing time, reasonable number and arrangement pattern of the reversing blade were determined by analyzing the variation coefficients of mortar density and coarse aggregate mass per unit volume in freshly mixed concrete. The results show that mixing uniformity within a given time varies with the different number and arrangement pattern of reversing blade since axial movement and inter-axis movement of mixture in the mixer trough change. Compared with the arrangement pattern, the number of reversing blade has greater effect on mixing uniformity. The reasonable number of reversing blade on single shaft is closely related to the total number of mixing blade on single shaft and length-width ratio of mixer trough. It’s suggested that the ratio of number of reversing blade on single shaft to the total number of mixing blade on single shaft should be controlled within 0.2 for short-wide mixer trough, and 0.3 for long-narrow mixer trough. When the number of reversing blade on single shaft is 2 and above, discontinuous-positive arrangement of the reversing blade is recommended to develop reversing flow of the mixture movement rapidly.
Last Update: 2016-07-29