Biomass fly ash as an alternative to coal fly ash in blended cements: Functional aspects

Fort Jan; Sal Jiri; Sevcik Radek; Dolezelova Magdalena; Keppert Martin; Jerman Milos; Zaleska Martina; Stehel Vojtech; Cerny Robert

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Biomass fly ash as an alternative to coal fly ash in blended cements: Functional aspects

机译：生物质粉煤灰作为混合水泥中的煤粉煤灰的替代方法：功能方面

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The tightening of environmental standards in the EU including the presupposed abatement of coal combustion power plants presents an important impulse towards the transition to a circular economy. However, the achievement of this challenging goal requires a solution to a number of problems. One of the downstream problems consists in the fact that the application of fly ash originating in coal combustion (CFA) as a partial cement replacement might be gradually abandoned in future decades. The first reason may be economical as the increasing environmental regulations will probably result in its more costly processing. The second one is related to the increasing use of alternative energy sources which can lead to the decreasing availability of CFA. Biomass fly ash (BFA) originating from wood combustion can be considered as one of the prospective environmentally more friendly candidates for a partial replacement of CFA as supplementary cementitious material (SCM). In this paper, functional aspects of a possible replacement of CFA by BFA in blended cements are analyzed. Complex characterization of BFA performed prior to the other investigations reveals very good prerequisites for its use as SCM. The experimental analysis of functional properties of Portland cement-BFA based composites after 28-days curing shows the suitability of BFA as SCM for the cement replacement up to 30% by mass. The data collected after 90 and 180 days of curing indicate a substantial improvement of strength of all analyzed composites. The significantly lower content of hazardous elements in BFA in a comparison with CFA presents another benefit; it can be used in blended cements without any further processing or treatment. (C) 2020 Elsevier Ltd. All rights reserved.

机译：欧盟环境标准的收紧包括预先燃煤发电厂的煤炭燃烧厂展望过渡到循环经济的重要冲动。然而，实现这一具有挑战性的目标需要解决一些问题。下游问题之一包括：在未来几十年中可能逐步放弃源于煤燃烧（CFA）作为煤炭燃烧（CFA）的应用。第一个原因可能是经济的，因为不断增加的环境法规可能导致其更昂贵的处理。第二个与越来越多的替代能源的使用有关，这可能导致CFA的可用性降低。源自木燃烧的生物质粉煤灰（BFA）可被认为是潜在的环境更友好的候选人之一，用于作为补充水泥材料（SCM）的部分替代CFA。本文分析了通过BFA在混合水泥中进行CFA的可能替代CFA的功能性方面。在其他调查之前进行BFA的复杂表征揭示了其用作SCM的非常好的先决条件。 28天固化后，波特兰水泥-BFA基复合材料功能特性的实验分析表明，BFA为SCM的水泥置换率高达30质量％。 90和180天固化后收集的数据表明所有分析的复合材料的强度大大提高。与CFA相比，BFA中危险因素的显着降低的含量显着呈现出另一个益处;它可以用于混合水泥，而无需进一步处理或治疗。（c）2020 elestvier有限公司保留所有权利。

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来源
《Construction and Building Materials》 |2021年第15期|121544.1-121544.11|共11页
作者
Fort Jan; Sal Jiri; Sevcik Radek; Dolezelova Magdalena; Keppert Martin; Jerman Milos; Zaleska Martina; Stehel Vojtech; Cerny Robert;
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作者单位

Czech Tech Univ Fac Civil Engn Dept Mat Engn & Chem Thakurova 7 Prague 16629 6 Czech Republic|Inst Technol & Business Ceske Budejovice Okruzni 517-10 Ceske Budejovice 37001 Czech Republic;

Inst Technol & Business Ceske Budejovice Okruzni 517-10 Ceske Budejovice 37001 Czech Republic;

Inst Technol & Business Ceske Budejovice Okruzni 517-10 Ceske Budejovice 37001 Czech Republic|Czech Acad Sci Inst Theoret & Appl Mech Prosecka 809-76 Prague 19000 9 Czech Republic;

Czech Tech Univ Fac Civil Engn Dept Mat Engn & Chem Thakurova 7 Prague 16629 6 Czech Republic;

Czech Tech Univ Fac Civil Engn Dept Mat Engn & Chem Thakurova 7 Prague 16629 6 Czech Republic;

Czech Tech Univ Fac Civil Engn Dept Mat Engn & Chem Thakurova 7 Prague 16629 6 Czech Republic;

Czech Tech Univ Fac Civil Engn Dept Mat Engn & Chem Thakurova 7 Prague 16629 6 Czech Republic;

Inst Technol & Business Ceske Budejovice Okruzni 517-10 Ceske Budejovice 37001 Czech Republic;

Czech Tech Univ Fac Civil Engn Dept Mat Engn & Chem Thakurova 7 Prague 16629 6 Czech Republic;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
Biomass fly ash; Pozzolanic activity; Heavy metals; Cement composites; Strength;

机译：生物质粉煤灰;火山糊精;重金属;水泥复合材料;力量;

Biomass fly ash as an alternative to coal fly ash in blended cements: Functional aspects

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