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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.

本文的目的是研究国外粉煤灰在混凝土中的应用。研究了各类粉煤灰的理化性能，掺加粉煤灰的混凝土性能。研究了高效减水剂与粉煤灰混合使用对高流动性混凝土的影响，以及大掺量粉煤灰在高流动性混凝土中应用的可能性。研究结果表明：1)粉煤灰的质量受煤的生产条件和燃烧温度的影响较大。掺粉煤灰混凝土的基本性能受粉煤灰比表面积、燃烧损失和SiO_2的影响。掺加分级细粉煤灰的混凝土质量变化趋向于低于掺加基粉煤灰的混凝土。2)高效减水剂的用量根据亚甲基蓝的吸附量、着火损失和比表面积计算。空气含量随时间的变化受粉煤灰种类的影响，贫民窟损失随空气含量的减小而增大。分级细粉煤灰是高效减水剂用量的2-3倍，以达到一定的空气含量。3)在长期阶段（182天），粉煤灰混凝土的强度高于无粉煤灰混凝土。强度发展主要受比表面积和粉煤灰中SiO_2的影响。干燥收缩率受粉煤灰种类和粉煤灰形状的影响。掺加粉煤灰的混凝土有增大干缩的趋势。4)分级细粉煤灰的高流动性受各种高效减水剂和粉煤灰的影响，新拌硬化后的高流动性混凝土性能优良。减水剂的用量是根据混凝土的流动性来计算的。