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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.

本文旨在研究国外燃煤粉煤灰在混凝土中的应用。研究内容包括不同类型粉煤灰的物理、化学性质，掺粉煤灰混凝土的性能。本文研究了高效减水剂与粉煤灰并用在大流动性混凝土中的作用，以及大掺量粉煤灰在大流动性混凝土中应用的可能性，结果表明：1）煤的生产条件和燃烧温度对粉煤灰的质量有很大影响;粉煤灰的比表面积、烧失量和SiO_2对混凝土的基本性能均有影响。掺分级细粉煤灰的混凝土质量变化趋势小于掺基粉煤灰的混凝土质量变化趋势。2）减水剂的掺量根据亚甲基蓝吸附量、烧失量和比表面积计算。含气量随时间的变化受飞灰种类的影响，随着含气量的减小，水泥浆体的损失增大。分级细粉煤灰的掺量为减水剂掺量的2- 3倍，以保证一定的含气量。3）粉煤灰混凝土的长期强度（182天）高于无粉煤灰混凝土。粉煤灰的比表面积和SiO_2是影响强度发展的主要因素。粉煤灰的种类和形状对干缩有影响。掺粉煤灰的混凝土有增大干缩的趋势。4）超塑化剂和粉煤灰的种类对分级细粉煤灰混凝土的大流动性有影响，新拌和硬化后的大流动性混凝土性能优良。根据混凝土的流动性计算高效减水剂的用量。