Synthesis and characterization of fly ash modified mine tailings-based geopolymers

Research output: Contribution to journalArticle

88 Citations (Scopus)

Abstract

Each year, the mining industry generates a significant amount of mine tailings. Storage of these tailings occupies large areas of land and leads to high monetary, environmental and ecological costs. In this research, a feasibility study is performed on geopolymerization of mine tailings so that they can be recycled and utilized as construction material. Considering the extremely high silicon to aluminum (Si/Al) ratio for the mine tailings, class F fly ash is used to adjust the Si/Al ratio. Sodium hydroxide (NaOH) solution is used as the alkaline reaction agent. The research consists of unconfined compression tests to evaluate the mechanical properties, scanning electron microscopy (SEM) imaging to investigate the microstructure, and the X-ray diffraction (XRD) analysis to study the phase compositions. The effects of fly ash content (which affects the Si/Al ratio), alkalinity (NaOH concentration), and curing time on the geopolymerization of mine tailings are studied in a systematic way. The results show that the Si/Al ratio and the alkalinity have profound effects on the mechanical and micro-structural properties of the mine tailings-based geopolymers. The curing time affects the mechanical and micro-structural properties of the mine tailings-based geopolymers mainly during the first 7 days. Based on the research, it can be concluded that mine tailings are a viable and promising construction material if the geopolymerization technology is utilized.

Original languageEnglish (US)
Pages (from-to)3773-3781
Number of pages9
JournalConstruction and Building Materials
Volume25
Issue number9
DOIs
StatePublished - Sep 2011

Fingerprint

Coal Ash
Geopolymers
Tailings
Fly ash
Silicon
Aluminum
Alkalinity
Curing
Structural properties
Sodium Hydroxide
Mineral industry
Phase composition
X ray diffraction analysis
Compaction
Sodium
Imaging techniques
Mechanical properties
Microstructure
Scanning electron microscopy

Keywords

  • Fly ash
  • Geopolymer
  • Microstructure
  • Mine tailings
  • Uniaxial compressive strength

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

Cite this

Synthesis and characterization of fly ash modified mine tailings-based geopolymers. / Zhang, Lianyang; Ahmari, Saeed; Zhang, Jinhong.

In: Construction and Building Materials, Vol. 25, No. 9, 09.2011, p. 3773-3781.

Research output: Contribution to journalArticle

@article{2586a53f1db94617a141456dbfa1774e,
title = "Synthesis and characterization of fly ash modified mine tailings-based geopolymers",
abstract = "Each year, the mining industry generates a significant amount of mine tailings. Storage of these tailings occupies large areas of land and leads to high monetary, environmental and ecological costs. In this research, a feasibility study is performed on geopolymerization of mine tailings so that they can be recycled and utilized as construction material. Considering the extremely high silicon to aluminum (Si/Al) ratio for the mine tailings, class F fly ash is used to adjust the Si/Al ratio. Sodium hydroxide (NaOH) solution is used as the alkaline reaction agent. The research consists of unconfined compression tests to evaluate the mechanical properties, scanning electron microscopy (SEM) imaging to investigate the microstructure, and the X-ray diffraction (XRD) analysis to study the phase compositions. The effects of fly ash content (which affects the Si/Al ratio), alkalinity (NaOH concentration), and curing time on the geopolymerization of mine tailings are studied in a systematic way. The results show that the Si/Al ratio and the alkalinity have profound effects on the mechanical and micro-structural properties of the mine tailings-based geopolymers. The curing time affects the mechanical and micro-structural properties of the mine tailings-based geopolymers mainly during the first 7 days. Based on the research, it can be concluded that mine tailings are a viable and promising construction material if the geopolymerization technology is utilized.",
keywords = "Fly ash, Geopolymer, Microstructure, Mine tailings, Uniaxial compressive strength",
author = "Lianyang Zhang and Saeed Ahmari and Jinhong Zhang",
year = "2011",
month = "9",
doi = "10.1016/j.conbuildmat.2011.04.005",
language = "English (US)",
volume = "25",
pages = "3773--3781",
journal = "Construction and Building Materials",
issn = "0950-0618",
publisher = "Elsevier Limited",
number = "9",

}

TY - JOUR

T1 - Synthesis and characterization of fly ash modified mine tailings-based geopolymers

AU - Zhang, Lianyang

AU - Ahmari, Saeed

AU - Zhang, Jinhong

PY - 2011/9

Y1 - 2011/9

N2 - Each year, the mining industry generates a significant amount of mine tailings. Storage of these tailings occupies large areas of land and leads to high monetary, environmental and ecological costs. In this research, a feasibility study is performed on geopolymerization of mine tailings so that they can be recycled and utilized as construction material. Considering the extremely high silicon to aluminum (Si/Al) ratio for the mine tailings, class F fly ash is used to adjust the Si/Al ratio. Sodium hydroxide (NaOH) solution is used as the alkaline reaction agent. The research consists of unconfined compression tests to evaluate the mechanical properties, scanning electron microscopy (SEM) imaging to investigate the microstructure, and the X-ray diffraction (XRD) analysis to study the phase compositions. The effects of fly ash content (which affects the Si/Al ratio), alkalinity (NaOH concentration), and curing time on the geopolymerization of mine tailings are studied in a systematic way. The results show that the Si/Al ratio and the alkalinity have profound effects on the mechanical and micro-structural properties of the mine tailings-based geopolymers. The curing time affects the mechanical and micro-structural properties of the mine tailings-based geopolymers mainly during the first 7 days. Based on the research, it can be concluded that mine tailings are a viable and promising construction material if the geopolymerization technology is utilized.

AB - Each year, the mining industry generates a significant amount of mine tailings. Storage of these tailings occupies large areas of land and leads to high monetary, environmental and ecological costs. In this research, a feasibility study is performed on geopolymerization of mine tailings so that they can be recycled and utilized as construction material. Considering the extremely high silicon to aluminum (Si/Al) ratio for the mine tailings, class F fly ash is used to adjust the Si/Al ratio. Sodium hydroxide (NaOH) solution is used as the alkaline reaction agent. The research consists of unconfined compression tests to evaluate the mechanical properties, scanning electron microscopy (SEM) imaging to investigate the microstructure, and the X-ray diffraction (XRD) analysis to study the phase compositions. The effects of fly ash content (which affects the Si/Al ratio), alkalinity (NaOH concentration), and curing time on the geopolymerization of mine tailings are studied in a systematic way. The results show that the Si/Al ratio and the alkalinity have profound effects on the mechanical and micro-structural properties of the mine tailings-based geopolymers. The curing time affects the mechanical and micro-structural properties of the mine tailings-based geopolymers mainly during the first 7 days. Based on the research, it can be concluded that mine tailings are a viable and promising construction material if the geopolymerization technology is utilized.

KW - Fly ash

KW - Geopolymer

KW - Microstructure

KW - Mine tailings

KW - Uniaxial compressive strength

UR - http://www.scopus.com/inward/record.url?scp=79956160317&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79956160317&partnerID=8YFLogxK

U2 - 10.1016/j.conbuildmat.2011.04.005

DO - 10.1016/j.conbuildmat.2011.04.005

M3 - Article

AN - SCOPUS:79956160317

VL - 25

SP - 3773

EP - 3781

JO - Construction and Building Materials

JF - Construction and Building Materials

SN - 0950-0618

IS - 9

ER -