Establishment of Analysis Method and Evaluation Test of Fresh Concrete.

新拌混凝土分析方法及评价试验的建立。

基本信息

批准号：
14350300
负责人：
MORI Hiroshi
金额：
$ 8.13万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350300/
关键词：
Yield Value Plastic Viscosity Property of Aggregates Pressure Dependent Property Shear Strain Dependent Property Transition of Property Viscoplastic Finite Element Method Viscoplastic Suspension Element Method 骨材形状マトリックス間隙水圧塑性粘度 /

项目摘要

The results obtained in this research are summarized as follows :1.Pressure Dependent Property, Shear Strain Dependent Property and Transition of PropertyIn order to clarify the pressure dependent property, the shear strain dependent property and the transition of property, the shear test and the improved shear box test were carried out. According to the experimental results, the pressure dependent property, the shear strain dependent property and the transition of property are clarified and modeled.2.Influence of Properties of Aggregate and Powder on ConsistencyIn order to clarify the influence of properties of aggregate and powder on consistency of fresh concrete or mortar, some experimental investigations were carried out. According to the experimental results, it is clarified that the consistency of fresh concrete and mortar is more influenced by consistency of matrix paste than the touch of fine and course aggregates with each other, and the replacement with sphere shaped fly ash decreases the yield value.3.Simulation of Shear Box TestIn order to clarify the internal distribution of stress in material in shearing box, the shear box test was simulated by viscoplastic finite element method and viscoplastic suspension element method. According to the simulational results with Bingham model, the shear strain dependent property was represented. Furthermore, it is clarified that the material between hinged walls are compressed under large shear strain because the distance between walls are extremely decreased.

本研究取得的成果概括如下： 1.压力依赖特性、剪切应变依赖特性及特性转变为了明确压力依赖特性、剪切应变依赖特性及特性转变，进行了剪切试验和改进。进行了剪切箱试验。根据实验结果，阐明了压力依赖特性、剪应变依赖特性以及特性转变并进行了建模。2.骨料和粉体特性对稠度的影响为了阐明骨料和粉体特性对稠度的影响对于新拌混凝土或砂浆，进行了一些实验研究。实验结果表明，新拌混凝土和砂浆的稠度更多地受基体浆体稠度的影响，而不是细骨料和粗骨料相互接触的影响，并且用球形粉煤灰替代会降低屈服值。 3.剪切箱试验模拟为了明确剪切箱内材料内部应力的分布情况，采用粘塑性有限元法和粘塑性悬挂单元法对剪切箱试验进行了模拟。根据Bingham模型的模拟结果，表征了剪应变相关特性。此外，还表明，由于壁之间的距离极大减小，铰接壁之间的材料在大剪切应变下受到压缩。