Oxide zinc addition in cement paste aiming electric arc furnace dust (EAFD) recycling

被引：21
|
作者：
Brehm, Feliciane Andrade [1 ]
Mendes Moraes, Carlos Alberto [1 ]
Espinosa Modolo, Regina Celia [1 ]
Faria Vilela, Antonio Cezar [2 ]
Coitinho Dal Molin, Denise Carpena [3 ]
机构：
[1] Univ Vale Rio Sinos UNISINOS, Mat Characterizat Res Grp, Av Unisinos 950, BR-93022000 Sao Leopoldo, RS, Brazil
[2] Univ Fed Rio Grande do Sul, Dept Met Engn, Ctr Tecnol, Av Bento Goncalves 9500,Setor 6, Porto Alegre, RS, Brazil
[3] Univ Fed Rio Grande do Sul, Dept Civil Engn, Av Osvaldo Aranha 99, BR-90035190 Porto Alegre, RS, Brazil
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2017年 / 139卷
关键词：
Setting time delay; Zinc oxide; Cement; Electric arc furnace dust; Recycling;
D O I：
10.1016/j.conbuildmat.2017.02.026
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Large amounts of electric arc furnace dust (EAFD) are generated in steel production, highlighting the need for recycling alternatives like the use of EAFD in production of building materials. However, EAFD delays hydration reactions of concrete. This study presents a model of cement hydration using ZnO as admixture and analyzes phenomena associated with zinc oxide compounds in cement pastes. Cement samples were analyzed by X-ray diffraction (XRD) with Rietveld refined, scanning electron microscopy (SEM), and characteristic X-ray mapping 1, 2, 4, 7, and 14 days into setting. Zn was present as ZnO on day 1. A new phase formed containing CaZn2(OH)(6)center dot 2H(2)O on day 4, suggesting the transition of ZnO to Zn hydroxide, especially on day 7, when hydration reactions were visually detected and Zn was found only as hydroxide. CaZn2(OH)(6)center dot 2H(2)O enables the hydration of cement with ZnO. A model to explain hydration reactions of cement admixed with ZnO was proposed. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：172 / 182
页数：11
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