Mechanical processing of wet stored fly ash for use as a cement component in concrete

IF 1.8 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY
M. J. McCarthy, T. Hope, L. Csetenyi
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Abstract

Wet storage effects on fly ash, mean processing may be necessary to achieve physical properties required for use in concrete. This paper considers drying, de-agglomeration and milling of various wet stored fly ashes at laboratory and pilot/benchtop scales, towards meeting these. In the laboratory, different batch quantities and milling times with as received/pre-screened materials were examined using a ball mill. Greater particle size reductions were obtained with increased milling time but at gradually reducing rates. Pre-screening and batch quantity had relatively minor effects on particle size reductions, with little difference found between these materials and dry stored fly ash. Extended milling time resulted in: a darkening of colour; slight increases in loss-on-ignition, the main oxides content, and crystalline components; reductions in water requirement (to a point); and greater reactivity. Similar effects were generally noted in concrete for the superplasticizing admixture dose to achieve a target slump and compressive (cube) strength. At pilot/benchtop scale, a dryer-pulverizer and jet mill were used, which gave general agreement with the behaviour noted in the laboratory, but with the effects tending to be less. Fineness levels in Standards were achievable, with subsequent performance appearing to depend on the milling process used.
对用作混凝土水泥成分的湿储存粉煤灰进行机械加工
湿贮存对粉煤灰的影响意味着有必要进行加工,以获得用于混凝土所需的物理特性。本文考虑在实验室和试验/台式规模上对各种湿法储存的粉煤灰进行干燥、去团聚和研磨,以满足这些要求。在实验室中,使用球磨机对不同批量和研磨时间的已收/预筛选材料进行了研究。随着研磨时间的增加,粒度减小的幅度也越来越大,但研磨率逐渐降低。预筛分和批量对粒度减少的影响相对较小,这些材料与干储存粉煤灰之间几乎没有差别。延长碾磨时间的结果是:颜色变深;点火损失、主要氧化物含量和结晶成分略有增加;需水量减少(达到一定程度);反应性增强。在混凝土中,为达到目标坍落度和抗压(立方体)强度而掺入的超塑化外加剂剂量通常也会产生类似的效果。在试验/台式规模上,使用了干燥粉碎机和喷射式粉碎机,结果与实验室中发现的行为基本一致,但影响往往较小。可以达到标准中的细度水平,随后的性能似乎取决于所使用的研磨工艺。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Magazine of Concrete Research
Magazine of Concrete Research 工程技术-材料科学:综合
CiteScore
4.60
自引率
11.10%
发文量
102
审稿时长
5 months
期刊介绍: For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.
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