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Mixture Proportioning of Concrete with Industrial Byproduct Powder

工业副产品粉末混凝土的配合比

基本信息

批准号：
12650460
负责人：
UEHARA Takumi
金额：
$ 0.51万
依托单位：
Nagoya Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

A siliceous powdered waste (primary component: SiO_2 density: about 2.65g/cm^3, specific surface area: 5〜200m^2/kg,) is discharged from a silica sand industry, classified as industrial waste (sludge) and chemically stable at normal temperature. About 0.6 million tons of siliceous waste per year as an industrial byproduct. The siliceous powdered waste is partially recycled, however about 80% remains unused. Finding an effective use for this material as a resource is an important issue.In order to use siliceous powdered waste effectively in high-fluidity concrete, the authors studied the mixing of concrete with siliceous powdered waste and its effect on fresh and hardening properties of the concrete. As silica sand products are commonly manufactured using wet processes, hence siliceous powdered waste is discharged wet. To investigate the broad application of siliceous powdered waste in the as-discharged state, as a consideration of energy conservation, experiments were performed for specimens with different moisture contents and different grades.The findings of this study can be summarized as follows:・The siliceous powdered waste was found to enhance the resistance to segregation of concrete, and to be applicable for use in high-fluidity concrete. The water-cement ratio was 0.50, the slump flow for the unit water content of 175 kg/m^3 was about 70.0 cm, and the 28-day compressive strength was about 35 Mpa.・It is possible to manufacture concrete with homogenous fresh and hardening properties using siliceous powdered waste by calculating the unit water content with consideration of the water adsorbed in the siliceous powdered waste.

硅砂工业中排出的一种硅质粉末状废弃物（主要成分为SiO_2，密度约为2.65g/cm^3，比表面积为5 × 10200m^2/kg），属工业废弃物（污泥），常温下化学性质稳定。每年约有60万吨硅质废物作为工业副产品。硅质粉末废物部分回收，但约80%仍未使用。为了有效地利用硅质废弃物粉末在高流动性混凝土中的应用，研究了硅质废弃物粉末在混凝土中的掺合及其对混凝土新拌和硬化性能的影响。由于硅砂产品通常使用湿法工艺制造，因此含硅粉末废物是湿排放的。为探讨废弃硅质粉末在混凝土中的广泛应用，从节能角度出发，对不同含水率、不同等级的废弃硅质粉末混凝土试件进行了试验研究，结果如下：·废弃硅质粉末混凝土具有提高混凝土抗离析能力的作用，适用于大流动性混凝土。水灰比为0.50，单位含水量为175 kg/m^3时的坍落度约为70.0 cm，28天抗压强度约为35 Mpa。通过考虑硅质粉末状废弃物中吸附的水计算单位含水量，可以使用硅质粉末状废弃物制造具有均匀的新鲜和硬化性能的混凝土。