Reuse of iron ore tailings in the production of geopolymer mortars
Abstract A great variety of silica and alumina-rich materials have been investigated in the production of alkaline activated binders (or geopolymers) with low environment impact, e.g. low CO2 emissions. Geopolymer mortars and concretes may be more environmentally friendly if not only Portland cement but also natural aggregates (sand, gravel) are replaced with waste materials. This article presents results of geopolymers made with tailings from the iron mining industry. The geopolymer matrices are composed of metakaolin (MK) activated with a sodium silicate + sodium hydroxide solution. Two different iron ore tailings replaced a natural quartz aggregate in the geopolymers’ formulation. The hardened properties assessed were compressive strength, water absorption, apparent density and porosity. Scanning electron microscopy (SEM) and x-ray micro computed tomography (µ-CT) were used to assess the changes in the microstructure when the tailings were incorporated into the geopolymers. Results show that the employment of iron ore tailings is not detrimental to the mechanical strength of geopolymers; however, geopolymers containing those alternative aggregates may present higher water absorption and porosity, and durability studies are required.
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2019
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oai:scielo:S2448-167X20190005005812019-09-13Reuse of iron ore tailings in the production of geopolymer mortarsBorges,Paulo Henrique RibeiroRamos,Fernanda Cristina ResendeCaetano,Tathiana RodriguesPanzerra,Túlio HallakSantos,Hersilia geopolymer alkali-activated binders wastes mine tailings sustainable construction materials Abstract A great variety of silica and alumina-rich materials have been investigated in the production of alkaline activated binders (or geopolymers) with low environment impact, e.g. low CO2 emissions. Geopolymer mortars and concretes may be more environmentally friendly if not only Portland cement but also natural aggregates (sand, gravel) are replaced with waste materials. This article presents results of geopolymers made with tailings from the iron mining industry. The geopolymer matrices are composed of metakaolin (MK) activated with a sodium silicate + sodium hydroxide solution. Two different iron ore tailings replaced a natural quartz aggregate in the geopolymers’ formulation. The hardened properties assessed were compressive strength, water absorption, apparent density and porosity. Scanning electron microscopy (SEM) and x-ray micro computed tomography (µ-CT) were used to assess the changes in the microstructure when the tailings were incorporated into the geopolymers. Results show that the employment of iron ore tailings is not detrimental to the mechanical strength of geopolymers; however, geopolymers containing those alternative aggregates may present higher water absorption and porosity, and durability studies are required.info:eu-repo/semantics/openAccessFundação GorceixREM - International Engineering Journal v.72 n.4 20192019-10-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S2448-167X2019000500581en10.1590/0370-44672017720169 |
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Borges,Paulo Henrique Ribeiro Ramos,Fernanda Cristina Resende Caetano,Tathiana Rodrigues Panzerra,Túlio Hallak Santos,Hersilia |
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Borges,Paulo Henrique Ribeiro Ramos,Fernanda Cristina Resende Caetano,Tathiana Rodrigues Panzerra,Túlio Hallak Santos,Hersilia Reuse of iron ore tailings in the production of geopolymer mortars |
author_facet |
Borges,Paulo Henrique Ribeiro Ramos,Fernanda Cristina Resende Caetano,Tathiana Rodrigues Panzerra,Túlio Hallak Santos,Hersilia |
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Borges,Paulo Henrique Ribeiro |
title |
Reuse of iron ore tailings in the production of geopolymer mortars |
title_short |
Reuse of iron ore tailings in the production of geopolymer mortars |
title_full |
Reuse of iron ore tailings in the production of geopolymer mortars |
title_fullStr |
Reuse of iron ore tailings in the production of geopolymer mortars |
title_full_unstemmed |
Reuse of iron ore tailings in the production of geopolymer mortars |
title_sort |
reuse of iron ore tailings in the production of geopolymer mortars |
description |
Abstract A great variety of silica and alumina-rich materials have been investigated in the production of alkaline activated binders (or geopolymers) with low environment impact, e.g. low CO2 emissions. Geopolymer mortars and concretes may be more environmentally friendly if not only Portland cement but also natural aggregates (sand, gravel) are replaced with waste materials. This article presents results of geopolymers made with tailings from the iron mining industry. The geopolymer matrices are composed of metakaolin (MK) activated with a sodium silicate + sodium hydroxide solution. Two different iron ore tailings replaced a natural quartz aggregate in the geopolymers’ formulation. The hardened properties assessed were compressive strength, water absorption, apparent density and porosity. Scanning electron microscopy (SEM) and x-ray micro computed tomography (µ-CT) were used to assess the changes in the microstructure when the tailings were incorporated into the geopolymers. Results show that the employment of iron ore tailings is not detrimental to the mechanical strength of geopolymers; however, geopolymers containing those alternative aggregates may present higher water absorption and porosity, and durability studies are required. |
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Fundação Gorceix |
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2019 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2448-167X2019000500581 |
work_keys_str_mv |
AT borgespaulohenriqueribeiro reuseofironoretailingsintheproductionofgeopolymermortars AT ramosfernandacristinaresende reuseofironoretailingsintheproductionofgeopolymermortars AT caetanotathianarodrigues reuseofironoretailingsintheproductionofgeopolymermortars AT panzerratuliohallak reuseofironoretailingsintheproductionofgeopolymermortars AT santoshersilia reuseofironoretailingsintheproductionofgeopolymermortars |
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