Study on practical system for production and construction of high-performance concrete with help of visualization technique of fresh concrete

新拌混凝土可视化技术的高性能混凝土生产施工实用系统研究

基本信息

批准号：
17360205
负责人：
HASHIMOTO Chikanori
金额：
$ 9.97万
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 (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

项目摘要

A purpose of this study is to develop the practical system for production and construction such as concrete mixer, concrete agitator and concrete punping machine in order to spread the use of high performance concrete such as high strength concrete, high durable concrete or high-fluidity concrete. After carrying on the investigation, we decided to develop the high performance mixer for manufacturing high strength concrete having more than 100N/mm2 of compressive strength, high durable concrete having more than 200 years of life time or high-fluidity concrete with the self-compacting ability of Rank 1. The bi-axial forced-mixing type of kinds of the mixer is high and the mixing efficiency is the highest. The flow patterns of the bi-axial forced-mixing type mixer are divided into two: the locally crossing flow and the globally circulating flow. We have developed and proposed a visualization technique that makes it possible to measure the degree of mixing with lapse time. At first a model … More concrete was assumed to be a viscous model of one phase system for the model mixer of two types with different area of the locally crossing flow, the mixing efficiency curve of the model concrete of the high viscosity and the low viscosity was a process of becoming uniform with the axial rotation, and quantification was attempted. Secondly we tried the quantification of the crossing flow around the blade generated when two circulating flows crossed by the pressure fluctuation of the pressure sensor installed in the surface of the blade of the mixer was attempted, and the size of the crossing flow generated in the model mixer of two types and the correlation of the mixing efficiency curve were considered. Thirdly we developed the new bi-axial forced-mixing typemixer with oscillation of mixture and mix proportion design based on mix proportion of high strength concrete are carried out to investigate the possibility for increasing properties and durability of concrete incorporating low quality recycled aggregate. As the results of this study, the mixing method with oscillation of mixture has effect on the concrete using low quality recycled aggregate to increase about 20% of compressive strength. Less

本研究的目的是开发混凝土搅拌机、混凝土搅拌机和混凝土泵送机等生产和施工实用系统，以推广高强度混凝土、高耐久性混凝土或高流动性混凝土等高性能混凝土的使用经过调研，我们决定开发高性能搅拌机，用于制造抗压强度超过100N/mm2的高强混凝土、寿命超过200年的高耐久性混凝土或高流动性混凝土，自密实能力为1级。各种类型的混合机中，双轴强制混合型混合机的混合效率最高。双轴强制混合型混合机的流型分为两种：我们开发并提出了一种可视化技术，可以测量随时间推移的混合程度。首先，模型被假定为单相系统的粘性模型。两种型号搅拌机在局部交叉流面积不同的情况下，高粘度和低粘度模型混凝土的搅拌效率曲线是随着轴向旋转而趋于均匀的过程，其次尝试了定量化。尝试了安装在搅拌机叶片表面的压力传感器的压力波动作用下，两股循环流交叉时所产生的叶片周围交叉流，并研究了两种型号搅拌机中产生的交叉流的大小及其相关性。混合效率曲线为第三，我们开发了新型双轴强制搅拌式搅拌机，并根据高强混凝土的配合比进行了配合比设计，以研究提高低品质再生骨料混凝土性能和耐久性的可能性。根据本研究的结果，混合料振荡搅拌方法对使用低品质再生骨料的混凝土的抗压强度提高了约20%。