The role of open and closed curing conditions on the leaching properties of fly ash-slag-based geopolymers

被引：75

作者：

Izquierdo, Maria ^{[1
,2
]}

Querol, Xavier ^{[2
]}

Phillipart, Charles ^{[3
]}

Antenucci, Diano ^{[3
]}

Towler, Mark ^{[1
]}

机构：

[1] Univ Limerick, Mat & Surface Sci Inst, Clin Mat Unit, Limerick, Ireland

[2] Inst Environm Assessment & Water Res, Barcelona 08034, Spain

[3] Inst Sci Serv Publ ISSeP, BE-4000 Liege, Belgium

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2010年 / 176卷 / 1-3期

关键词：

Fly ash; Blast furnace slag; Geopolymers; Curing conditions; Leaching; Compressive strength; HEAVY-METALS; WASTE; IMMOBILIZATION; TEMPERATURE;

D O I：

10.1016/j.jhazmat.2009.11.075

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

This study deals with the synthesis of geopolymers from co-fired fly ash and blast furnace slags. Geopolymer bodies were simultaneously synthesized in open and closed curing conditions in order to elucidate the role of this parameter on their resultant properties. Open curing conditions produce solid bodies characterized by high porosity, low compressive strength and exacerbated leaching of certain oxyanionic metalloids. By contrast, protected curing promotes the binder development, giving rise to higher strength and less porous systems. This imposes physical restrictions to leaching which decreases and/or retards releases of oxyanionic metalloids in comparison to open curing conditions. Fly ash-slag-based geopolymers may immobilize a number of trace pollutants such as Be, Bi, Cd, Co, Cr, Cu, Nb, Ni, Pb, REE, Sn, Th, U, Y and Zr, regardless of the curing conditions. Due to geopolymers displaying weak assimilation capacity for oxyanionic species, their successful regarding oxyanionic retention is strongly dependent on porosity and therefore on curing conditions applied. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：623 / 628

页数：6

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