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Research on a method of estimating quality of concrete using mixed aggregate

混合骨料混凝土质量评价方法的研究

基本信息

批准号：
08650683
负责人：
SIMIZU Akiyuki
金额：
$ 1.41万
依托单位：
Science University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650683/
关键词：
Concrete using mixed aggregate Unit volume weight Compressive strength Static modulus of elasticity Drying-shrinkage Mixing ratio Water-cement ratio

项目摘要

1. The properties of fresh concrete were determined by varying aggregates mixing ratio and water-cement ratio (mixture of lightweight aggregate and normal-weight aggregate). The following aspects are clarified. The targeted properties for fresh conncrete were obtained by using light weight aggregate and normal-weight aggregate in various mixing ratios. We studied concrete containing varying mixing ratio of normal-weight aggregate and light weight aggregate, water-cement ratio. The following aspects are clarified. (1) The compressive strength increases as the mixing ratio of normal coarse aggregate increases, which can be estimated based on the unit volume weight as each water-cement ratio. (2) The static modulus of elasticity increases as the mixing ratio of normal fine aggregate and normal coarse aggregate increases, which can be estimated based on the unit volume weight regardless of water-cement ratio, which is applicable to Tomozawa and Noguchis' modulus estimation equation at water-cement ratio of 40% or less.2. Influence of concrete using the blended fine aggregate of mixing ratio of 30% and 70% which were mixed normal sand with fero-nickel slag and copper slag on bleeding, strength and drying shrinkage of normal and light weight concrete were determined. The following aspects are clarified. On high-strength concrete, the blended fine aggregate can be used. On normal strength concrete, as the ratio of slag in the blended sand should be limited less than about 30%, it can be used as well as normal concrete.

1.通过改变骨料掺量和水灰比（轻骨料和普通骨料的混合）来测定新拌混凝土的性能。阐明了以下几个方面。采用轻集料和普通集料按不同配比配制新拌混凝土，获得了新拌混凝土的目标性能。研究了不同轻集料与普通集料配合比、水灰比的混凝土。阐明了以下几个方面。(1)抗压强度随普通粗集料掺量的增加而增加，可根据各水灰比的单位容重估算。(2)静态弹性模量随普通细集料和普通粗集料配合比的增大而增大，无论水灰比如何，静态弹性模量都可以根据单位容重进行估算，在水灰比小于等于40%时，适用于Tomozawa和Noguchis的模量估算公式.研究了掺加铁镍渣、铜渣的普通砂和掺加铁镍渣、铜渣的掺加比分别为30%和70%的细集料对普通混凝土和轻集料混凝土泌水性、强度和干缩的影响。阐明了以下几个方面。在高强混凝土中，可以采用掺合料。在普通强度混凝土中，矿渣掺量应控制在30%左右，可与普通混凝土一样使用。