Strength Development and Pore Structure Characterisation of Binary Alkali-activated Binder Based on Tungsten Mining Waste

Naim Sedira; João  Castro-Gomes

Article Details

Strength Development and Pore Structure Characterisation of Binary Alkali-activated Binder Based on Tungsten Mining Waste

Authors:

Naim Sedira | João Castro-Gomes

Publisher:

KnE Social Sciences

Journal:

KnE Engineering Vol.5 Issue 4, pp.73-85

Document Type:

Article

Publication Date:

4/2020

Document Language:

English

Document ID (Org No.):

2001523855

pISSN:

2518-6841

Keywords:

Abstract:

 The mineralogical properties of tungsten mining waste mud (TMWM) make its valorisation and re-usage as an alumino-silicate source material to produce an alkali-activated binder without calcination is a challenge. Moreover, the dissolution of silicate and alumina species from TMWM is very slow. Despite the crystallinity of TMWM, this study demonstrates that its combination with other sources of the alumino-silicate source was the materials–such as red clay brick waste(RCBW),ground granulated blast furnace slag (GGBFS) and electric arc furnace slag (EAFS) – improved the compressive strength and the pore structure of the alkali-activated matrix.Thecombinedprecursors (90 vt.%TMWM+10 vt.%RCBW, 90 vt.%TMWM+10 vt.%GGBFS, and 90 vt.%TMWM+10 vt.%EAFS) were activated using a combination of alkaline activator solutions (sodium silicate and sodium hydroxide) with the ratio of 1:3(66.6wt.%sodiumsilicatecombined with 33.33 wt.% of NaOH 10M). The results show that the compressive strength increased from11.23MPa at 28 days to reach 24.98MPawhentheTMWMwaspartially replacedby10vt.%RCBW. In addition,this study shows that the interconnected porosity decreased where the critical pore size was reduced from 21.28 µm to 0.55 µm for the tungsten mining waste-based alkali-activated binder and the binary alkali-activated binder based on TMWM and RCBW.

Article Details

Strength Development and Pore Structure Characterisation of Binary Alkali-activated Binder Based on Tungsten Mining Waste

Authors:

Naim Sedira | João Castro-Gomes

Publisher:

KnE Social Sciences

Journal:

KnE Engineering Vol.5 Issue 4, pp.73-85

Document Type:

Article

Publication Date:

4/2020

Document Language:

English

Document ID (Org No.):

2001523855

pISSN:

2518-6841

Mining Waste

Alkali-activated

Microstructure

MIP

Metakaolin

Issues

Article Details

Strength Development and Pore Structure Characterisation of Binary Alkali-activated Binder Based on Tungsten Mining Waste

Authors: Naim Sedira | João Castro-Gomes

Publisher: KnE Social Sciences

Journal: KnE Engineering Vol.5 Issue 4, pp.73-85

Document Type: Article

Publication Date: 4/2020

Document Language: English

Document ID (Org No.): 2001523855

pISSN: 2518-6841

Mining Waste

Alkali-activated

Microstructure

MIP

Metakaolin

Issues

Authors:

Naim Sedira | João Castro-Gomes

Publisher:

KnE Social Sciences

Journal:

KnE Engineering Vol.5 Issue 4, pp.73-85

Document Type:

Article

Publication Date:

4/2020

Document Language:

English

Document ID (Org No.):

2001523855

pISSN:

2518-6841