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Global Estimation for Cementitious Materials from The Viewpoint of High Performance Concrete

从高性能混凝土的角度对胶凝材料进行整体估算

基本信息

批准号：
08455206
负责人：
NAGATAKI Shigeyoshi
金额：
$ 4.29万
依托单位：
Niigata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至无数据
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455206/
关键词：
cementitioius materials blast furnace slag fly ash silica fume viscosity yield valuc superplasticizer volcanic ash 高強度化高流動化高耐久化

项目摘要

In this investigation, cementitious materials, such as blast furnace slag, fly ash and silica fume, were globally estimated from the viewpoint of high performance concrete. In addition, as another materials, volcanic ash was investigated for utilization of concrete.To reduce unit powder content of high fluidity concrete by controlling powder's particle size distribution, the ranges of viscosity and yield value of mortar to be part of concrete, which satisfy the high fluidity, nonsegregating property and passability between steel bars, were clarified. And the physical characters of powser, which can satisfy the ranges with the minimum unit powder content, were clarified. Besed on the results, new cementitious powder which can produce high fluidity concrete with low unit powder content was presented.Investigations were planned to make clear that relationship between size distribution of powders and rheological properties (yield value and viscosity) of mortar which have direct effects upon properties of high fluidity coucrete. As the results of this study, they were found that yield value of mortar is influenced by n-value of the Rosin-Rammler which is the main factor of amount of excess water in mortar, and that viscosity of mortar is influenced by blaine surface area, which it is reason of the effect obtained by combining absorption of superplasticizer and thickness of water film.

本研究从高性能混凝土的角度对矿渣、粉煤灰、硅灰等胶凝材料进行了全面的评价。此外，还研究了火山灰作为另一种材料在混凝土中的应用，通过控制火山灰的粒度分布，降低高流动性混凝土的单位粉料用量，明确了满足高流动性、不离析性和钢筋间通过性的砂浆粘度和屈服值范围。阐明了满足最小单位粉量范围的粉体物理特性。在此基础上，提出了一种能以较低的单位粉料含量配制高流动性混凝土的新型胶凝粉料，并计划研究影响高流动性混凝土性能的胶凝粉料粒度分布与砂浆流变性能（屈服值和粘度）之间的关系。研究结果表明，影响砂浆屈服值的主要因素是Rosin-Rammler指数n值，它是影响砂浆中过量水含量的主要因素;影响砂浆粘度的主要因素是Blaine表面积，这是高效减水剂的吸水性和水膜厚度共同作用的结果。