Study on Effects Utilization of the Fly Ash Produced from Imported Coal for Concrete

进口煤粉煤灰用于混凝土的效果研究

基本信息

批准号：
07650682
负责人：
SHIIBA Hiroyuki
金额：
$ 1.41万
依托单位：
Fukuoka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

The purpose of this paper is to investigate the utilization of fly ash produced from foreign coal on concrete. The investigation includes the physical and chemical properties of various types of fly ash, the properties of the concrete with fly ash. The effects of high fluidity concrete using superplasticizer together with fly ash, and the possibilities of using high volume fly ash on high afluigity concrete.The results obtained inthis proper are summarized as follows :1) The qualities of fly ash are highly infuenced by the producing condition and buming temperature of coal. And the fundamental properties of concerete containing fly ash are affected by specific surface area, ignition loss, and SiO_2 from fly ash. The change i the quality of concerete containing classified fine fly ash tends to be lower than the case with base fly ash.2) The amounts of superplasticizer used are calculated correspondingly to asdorption of methylene blue, ignition loss, and specific surface area. The change of air content with time is affected by the types of fly ash, and slum loss increases as air content decreasses. Classified fine fly ash is 2-3times as quanity of superplasticizer to give a certain air content as base fly ash.3) The strength of fly ash concrete is higher than that of fly ash free concrete at the long term stages (182days). Strength development is mainly affected by the specific surface areea and SiO_2 from fly ash. Drying shrinkage is inflyenced by the kinds fly ashes and shapes of fly ash. Concrete with fly ash is trendency to increase the drying shrinkage.4) High fluidity with classified fine fly asj are affected by the kinds of superplasticizers and fly ashes, and the property of fresh and hardened high fluidity concrete is good quality. The amount of superplasticizer use is calculated correspondingly to the flowability of concrete.

本文的目的是调查混凝土上外煤生产的粉煤灰的利用。该研究包括各种类型的粉煤灰的物理和化学特性，即用粉煤灰的混凝土特性。使用粉煤灰将高流动性混凝土与粉煤灰一起使用高含量粉煤灰在高含流混凝土上的可能性。在适当的情况下获得的结果总结如下：1）粉煤灰的质量高度受到煤的生产条件和燃烧温度的高度增强。含有粉煤灰的相关属性的基本特性受到特定表面积，点火损失和粉煤灰的SIO_2的影响。变化I的质量含有分类的高粉煤灰的质量往往低于基本粉煤灰的情况。2）使用的超塑料量相应地计算为亚甲基蓝色，点火损失和特定表面区域的诱使。空气含量随时间的变化受粉煤灰类型的影响，并且随着空气含量的减少，贫民窟损失增加。分类的细粉煤灰为2-3倍，作为超级增生剂的量度，可以作为基本粉煤灰提供一定的空气含量。3）粉煤灰混凝土的强度高于长期阶段（182天）的粉煤灰混凝土的强度。强度发展主要受粉煤灰的特定表面和SIO_2的影响。干燥的收缩是通过粉煤灰和粉煤灰形状的类型的。用粉煤灰混凝土是增加干燥收缩的趋势。4）高流动性ASJ的高流动性受到质超塑料和粉煤灰的影响，新鲜和硬化的高流动性混凝土具有良好的质量。超增塑剂的使用量相应地计算为混凝土的流动性。