Experimental Study on Mixing Mechanism of Fresh Concrete in A New Type of Vertical Continuous Mixer with Gravity

新型立式重力连续搅拌机新拌混凝土搅拌机理试验研究

• 批准号: 11650467
• 负责人: HASHIMOTO Chikanori
• 金额: $ 2.24万
• 依托单位: The University of Tokushima
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650467/
• 关键词: Performance-base construction design; Consistency; Fresh concrete; Acceleration; Flow rate; Table vibrator; Slump; Flow Visualization Technique; 骨材形状; 容器形状; 速度頻度分布; 練混ぜ機構; 重力落下; モデルコンクリート

In the fall of 1995, Dr.M.Maeda and Dr.K.Yamada developed continuous M-Y mixer newly. This mixer has number of mixing units connected in series. When using this mixer in the vertical way, mixing work can be done under gravity force only, with the new modified mechanism of inter-particle collision and impact. The vertical set-up of this continuous mixer is called as vertical continuous mixer with gravity. The mixing process inside the vertical continuous mixer is totally different with that of existing mixers. However, the mechanism of mixing process inside the mixer is not clear and they can't explain that how to decide the shape and the dimension of the units consisted by the mixer. The aim of this paper is to be clear the mechanism of mixing process of the vertical continuous mixer with gravity and to obtain the useful information on the design of a high-performance this continuous mixer. In this research, the mixing mechanism at work in this continuous mixer was investigated experimentally using a visualization technique.As a result of this experimental study, it is very important that the time of accumulation of materials inside mixing units is long and the turbulence of velocity and angle of falling materials is very large as far as the blockade of materials through mixing units is not happened in order to increase the mixing efficiency of this continuous mixer.

1995年秋，前田先生和山田先生新开发了连续式M-Y混合机。该混合器具有串联连接的多个混合单元。立式使用时，只需在重力作用下进行混合工作，采用改进的颗粒间碰撞和冲击机制。这种连续混合器的垂直设置被称为重力垂直连续混合器。立式连续混炼机内部的混炼过程与现有混炼机完全不同。然而，混合器内部混合过程的机理尚不清楚，也无法解释如何确定混合器组成单元的形状和尺寸。本文的目的是弄清立式重力连续混炼机的混炼机理，为设计高性能的立式重力连续混炼机提供有用的信息。在这项研究中，在这种连续混合机的混合机制进行了实验研究，使用可视化技术。作为这项实验研究的结果，在不发生物料堵塞的情况下，物料在混合器内的堆积时间要长，下落物料的速度和角度要有很大的紊流，以增加混合效果这是连续搅拌机的效率。

项目成果

Ayaji Masumoto, Nobuhiro Takashima and Chikanori Hashimoto: "A Study of A Computer Simulation for Self-Compacting Concrete Flow"Proceedings of 2001 Second International Conference on Engineering Materials. Vol.2. 67-76 (2001)

Ayaji Masumoto、Nobuhiro Takashima 和 Chikanori Hashimoto：“自密实混凝土流动计算机模拟研究”2001 年第二届国际工程材料会议论文集。

Takao Ueda: "Hydrogen Embrittlement of Notched PC Steel Bars due to Applying Electric Current"6^<th> International Conference on Inspection, Appraisal, Repairs & Maintenance of Building & Structures. 361-368 (1999)

Takao Ueda：“因施加电流而导致缺口 PC 钢棒的氢脆”第 6 届国际检验、鉴定、维修会议

Takao Ueda, Masanobu.Ashida, Shigeru.Mizoguchi and Toyoaki Miyagawa: "Hydrogen Embrittlement of Notched PC Steel Bars due to Applying Electric Current"6^<th> International Conference on Inspection, Appraisal, Rapairs & Maintenance of Building & Structures

Takao Ueda、Masanobu.Ashida、Shigeru.Mizoguchi 和 Toyoaki Miyakawa：“由于施加电流导致的缺口 PC 钢棒的氢脆”第 6 届国际检验、评估、修复会议

Chikanori HASHIMTO: "Study on Deformability of Fresh Concrete flowing in pipe with help of Visualization Technique"Proceedings of the Second International Conference on Advanced Materials Development and Performance. Vol.2. 519-524 (1999)

Chikanori HASHIMTO：“利用可视化技术研究管道中流动混凝土的变形能力”第二届先进材料开发与性能国际会议论文集。

石丸啓輔: "重力による材料落下型連続ミキサの練混ぜ性能の可視化"コンクリート工学年次論文報告集. Vol.22・No.2. 1303-1308 (2000)

Keisuke Ishimaru：“使材料通过重力落下的连续搅拌机的搅拌性能的可视化”混凝土工程年度论文报告集第 22 卷·第 1303-1308 号（2000 年）。