Durability of red mud-fly ash based geopolymer and leaching behavior of heavy metals in sulfuric acid solutions and deionized water

被引：157

作者：

Zhang, Mo ^{[1
,2
]}

Zhao, Mengxuan ^{[1
]}

Zhang, Guoping ^{[3
]}

Mann, Derrick ^{[4
]}

Lumsden, Kevon ^{[4
]}

Tao, Mingjiang ^{[1
]}

机构：

[1] Worcester Polytech Inst, Dept Civil & Environm Engn, Worcester, MA 01609 USA

[2] Dalian Jiaotong Univ, Dept Civil & Safety Engn, Dalian 116028, Liaoning Provin, Peoples R China

[3] Univ Massachusetts, Dept Civil & Environm Engn, 38 Marston Hall,130 Nat Resources Rd, Amherst, MA 01003 USA

[4] Assumpt Coll, Math Concentrat Civil Engn Dept, Worcester, MA 02067 USA

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2016年 / 124卷

基金：

美国国家科学基金会;

关键词：

Geopolymers; Red mud; Fly ash; Sulfuric acid resistance; Leaching behavior; FTIR; Chemical Bonds; Mineralogy; HARDENED PASTE; MECHANICAL-PROPERTIES; STRENGTH; METAKAOLIN; CONCRETE; CEMENTS; ATTACK; MICROSTRUCTURE; TEMPERATURE; RESISTANCE;

D O I：

10.1016/j.conbuildmat.2016.07.108

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The durability and heavy metal leaching behavior of red mud-class F fly ash based geopolymers (RFFG) were investigated in this study. RFFG specimens were soaked in sulfuric acid solutions (pH = 3.0) and deionized water (pH = 7.0) for 1-120 days, and then their remaining mechanical properties and the change in the microstructures were characterized with unconfined compression tests, three-point bending tests, scanning electron microscopy, X-ray diffractometer and Fourier transform infrared spectroscopy, respectively. The leaching behavior of heavy metals in RFFG samples after soaking up to 14 days was also examined with atomic absorption spectroscopy. The RFFG samples' resistance against sulfuric acid was comparable to the ordinary Portland cement (OPC), and their mechanical degradation was mainly attributed to the depolymerization and dealumination of geopolymer gels. The highest concentrations of the heavy metals leached by the sulfuric acid from the RFFG samples were much lower than the respective US EPA limits for soil contamination. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：373 / 382

页数：10

共 53 条

[1] UTILIZATION AND DISPOSAL OF FLY-ASH AND OTHER COAL RESIDUES IN TERRESTRIAL ECOSYSTEMS - A REVIEW [J].

ADRIANO, DC ;

PAGE, AL ;

ELSEEWI, AA ;

CHANG, AC ;

STRAUGHAN, I .

JOURNAL OF ENVIRONMENTAL QUALITY, 1980, 9 (03) :333-344

[2] Durability and leaching behavior of mine tailings-based geopolymer bricks [J].

Ahmari, Saeed ;

Zhang, Lianyang .

CONSTRUCTION AND BUILDING MATERIALS, 2013, 44 :743-750

[3] A review on the utilization of fly ash [J].

Ahmaruzzaman, M. .

PROGRESS IN ENERGY AND COMBUSTION SCIENCE, 2010, 36 (03) :327-363

[4]

Allahverdi A, 2006, CERAM-SILIKATY, V50, P1

[5]

Allahverdi A, 2005, CERAM-SILIKATY, V49, P225

[6]

Allahverdi A, 2001, CERAM-SILIKATY, V45, P81

[7] Environmental, physical and structural characterisation of geopolymer matrixes synthesised from coal (co-)combustion fly ashes [J].

Alvarez-Ayuso, E. ;

Querol, X. ;

Plana, F. ;

Alastuey, A. ;

Moreno, N. ;

Izquierdo, M. ;

Font, O. ;

Moreno, T. ;

Diez, S. ;

Vazquez, E. ;

Barra, M. .

JOURNAL OF HAZARDOUS MATERIALS, 2008, 154 (1-3) :175-183

[8] Aqueous leachability of metakaolin-based geopolymers with molar ratios of Si/Al=1.5-4 [J].

Aly, Z. ;

Vance, E. R. ;

Perera, D. S. ;

Hanna, J. V. ;

Griffith, C. S. ;

Davis, J. ;

Durce, D. .

JOURNAL OF NUCLEAR MATERIALS, 2008, 378 (02) :172-179

[9] Coal fly ash as raw material for the manufacture of geopolymer-based products [J].

Andini, S. ;

Cioffi, R. ;

Colangelo, F. ;

Grieco, T. ;

Montagnaro, F. ;

Santoro, L. .

WASTE MANAGEMENT, 2008, 28 (02) :416-423

[10]

[Anonymous], 2013, ASTMC618

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