Multi-Phase Model for Flowing Conrete Considering Mixing, Temperature and TIme

考虑混合、温度和时间的流动混凝土多相模型

• 批准号: 07455179
• 负责人: OZAWA Kazumasa
• 金额: $ 4.74万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455179/
• 关键词: Multi-phase model; constitutive relation; solid particles; viscus liquid; fresh concrete; 凝集; 分散; 高性能減水剤

The objective of this study Is to establish the multi-phase model for flowing concrete considering the effect of mixing, temperature adn time after mixing. Concrete Is taken as a composite material of paste, fine aggregate and coarse aggregate. Fine and Coarse aggregate were assumed to particle assemblies having single grading respectively. Paste was assumed as a viscous liquid. Equation of motions for each phase were formulated and constitutive relation of total flowing concrete was derived.MOtion of solid partcle assembly was described considering the mean motion and fluctuation motion. Generated stress In each phase Is governed by the relative motion of solid partcles. Governing equation was formulated considering these effects and Interractions between different phases and the effect of normal stress on shear behavior were considered.Sensitivity analysis was carried out for various mix proportions of fresh concrete. Computed results of stress and strain rate relations described that coarse aggregate phase has a major effect on generated stress and that presence of mortar and viscous paste relax the Interactions between coarse aggregate particles. Basic analytical frame work was established for computer simulation of fresh concrete.Floculation structure of powder particles should be considered In paste phase so as to simulate the various behaviors of fresh concrete such as mixing, temperature and time after mixing.

本研究的目的是建立流动混凝土的多相模型，考虑搅拌、温度和搅拌后时间的影响。混凝土是由浆体、细骨料和粗骨料组成的复合材料。细集料和粗集料分别被假定为具有单一级配的颗粒集合体。膏状物被假定为粘性液体。建立了各相的运动方程，推导了全流态混凝土的本构关系，考虑了平均运动和脉动运动，描述了固体颗粒集合体的运动。在每一相中产生的应力由固体颗粒的相对运动控制。建立了考虑这些影响的控制方程，并考虑了各相之间的相互作用和正应力对新拌混凝土抗剪性能的影响，对新拌混凝土的不同配合比进行了敏感性分析。应力和应变率关系的计算结果表明，粗骨料相产生的应力和砂浆和粘性膏体的存在松弛粗骨料颗粒之间的相互作用的主要影响。建立了新拌混凝土计算机模拟的基本分析框架，认为应考虑粉粒在浆体阶段的絮团结构，以模拟新拌混凝土的拌和、温度和拌和后时间等各种行为。

项目成果

Amorn Pimanmas,Kazumasa Ozawa: "Mathematical Modeling of Shear Constitutive Relationship for Flowing Fresh Concrete." International Conference on Urban Engineering In Asian Cities In the 21^α Century,AIT.(1996)

Amorn Pimanmas、Kazumasa Ozawa：“流动新混凝土剪切本构关系的数学建模。”21^α 世纪亚洲城市工程国际会议，AIT。（1996）

Amorn Pimanmas: "Multi-Phase Model for Constitutive Relationship of Flowing Fresh Concrete." Master Thesis submitted to The University of Tokyo.(1996)

Amorn Pimanmas：“流动新混凝土本构关系的多相模型。”

Amorn PIMANMAS and Kazumasa OZAWA: "Modeling of the Mechanism of Shear Stress Generation due to Coarse Aggregate Interaction IN Fresh Concrete" 51st Annual conference of JSCE. 232-233 (1996)

Amorn PIMANMAS 和 Kazumasa OZAWA：“新拌混凝土粗骨料相互作用产生剪应力产生机制的建模”JSCE 第 51 届年会。

Amorn Pimanmas and Kazumasa OZAWA: "Mathematical Modeling of Shear Constitutive Relationship for Flowing Fresh Concrete" Int. Conference on Urban Eng. in Asian Cites In the 21st Century, AIT. (1996)

Amorn Pimanmas 和 Kazumasa OZAWA：“流动新混凝土剪切本构关系的数学模型” Int。

Amorn PIMANMAS and Kazumasa OZAWA: "A Microscopic Model to Predict Viscosity of Concentrated Suspension" Proc. od JCI Symposium on Consistency and Workability of Fresh Concrete, JCI. 19-24 (1996)

Amorn PIMANMAS 和 Kazumasa OZAWA：“预测浓缩悬浮液粘度的微观模型”Proc。