Mechanical and thermal properties of geopolymers from mixtures of coal ash and rice hull ash using water glass solution as activator

Geopolymers, from industrial wastes such as blast furnace slag, red mud, and coal ash, among others, have emerged as technically viable, economically competitive, and environmentally attractive supplements and even alternatives to ordinary Portland cement (OPC). Furthermore, while the most impact sh...

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Main Authors: Kalaw, Martin Ernesto L., Culaba, Alvin B., Nguyen, Hoc Thang, Nguyen, Khoi, Hinode, Hirofumi, Kurniawan, Winarto, Gallardo, Susan M., Promentilla, Michael Angelo B.
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Published: Animo Repository 2015
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Online Access:https://animorepository.dlsu.edu.ph/faculty_research/2365
https://animorepository.dlsu.edu.ph/context/faculty_research/article/3364/type/native/viewcontent
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spelling oai:animorepository.dlsu.edu.ph:faculty_research-33642021-08-25T02:01:07Z Mechanical and thermal properties of geopolymers from mixtures of coal ash and rice hull ash using water glass solution as activator Kalaw, Martin Ernesto L. Culaba, Alvin B. Nguyen, Hoc Thang Nguyen, Khoi Hinode, Hirofumi Kurniawan, Winarto Gallardo, Susan M. Promentilla, Michael Angelo B. Geopolymers, from industrial wastes such as blast furnace slag, red mud, and coal ash, among others, have emerged as technically viable, economically competitive, and environmentally attractive supplements and even alternatives to ordinary Portland cement (OPC). Furthermore, while the most impact shall be achieved with large-scale use in the general building and structural sector, as replacement or supplement to OPC, the properties of these geopolymers may be optimized for special niche applications. One of these applications is for light weight, low thermal conductivity, heat resistant, and moderate strength cement binder for low rise residential buildings. In this study, compressive strength, heat resistance, volumetric weight, mass loss, water absorption and thermal conductivity of geopolymers formed from mixtures of coal bottom ash and rice hull ash (CBA-RHA) and coal fly ash and rice hull ash (CFA-RHA) with sodium silicate solution (modulus 2.5) as activator were evaluated. Using mixture design and the JMP statistical software, the CBA-RHA combination at a mass ratio of 46% CBA, 32% RHA with 22% WGS gave properties at maximum desirability of 17.6 MPa compressive strength, 1640 kg/m3 volumetric weight, 273 kg/m3 water absorption, 28 MPa compressive strength after high temperature exposure (1000oC for 2 hours) with 4.4% mass loss, and 0.578 W/m-K thermal conductivity. On a performance basis, even as the geopolymers are formed as paste, these properties fall within the standards for lightweight OPC based-concrete with strength requirements for residential buildings. The low thermal conductivity and higher strength after high temperature exposure vis-à-vis OPC are additional advantages for consideration. © 2015, Gadjah Mada University. All rights reserved. 2015-01-01T08:00:00Z text text/html https://animorepository.dlsu.edu.ph/faculty_research/2365 https://animorepository.dlsu.edu.ph/context/faculty_research/article/3364/type/native/viewcontent Faculty Research Work Animo Repository Fly ash--Testing Coal ash--Testing Rice hull ash--Testing Soluble glass Mechanical Engineering
institution De La Salle University
building De La Salle University Library
continent Asia
country Philippines
Philippines
content_provider De La Salle University Library
collection DLSU Institutional Repository
topic Fly ash--Testing
Coal ash--Testing
Rice hull ash--Testing
Soluble glass
Mechanical Engineering
spellingShingle Fly ash--Testing
Coal ash--Testing
Rice hull ash--Testing
Soluble glass
Mechanical Engineering
Kalaw, Martin Ernesto L.
Culaba, Alvin B.
Nguyen, Hoc Thang
Nguyen, Khoi
Hinode, Hirofumi
Kurniawan, Winarto
Gallardo, Susan M.
Promentilla, Michael Angelo B.
Mechanical and thermal properties of geopolymers from mixtures of coal ash and rice hull ash using water glass solution as activator
description Geopolymers, from industrial wastes such as blast furnace slag, red mud, and coal ash, among others, have emerged as technically viable, economically competitive, and environmentally attractive supplements and even alternatives to ordinary Portland cement (OPC). Furthermore, while the most impact shall be achieved with large-scale use in the general building and structural sector, as replacement or supplement to OPC, the properties of these geopolymers may be optimized for special niche applications. One of these applications is for light weight, low thermal conductivity, heat resistant, and moderate strength cement binder for low rise residential buildings. In this study, compressive strength, heat resistance, volumetric weight, mass loss, water absorption and thermal conductivity of geopolymers formed from mixtures of coal bottom ash and rice hull ash (CBA-RHA) and coal fly ash and rice hull ash (CFA-RHA) with sodium silicate solution (modulus 2.5) as activator were evaluated. Using mixture design and the JMP statistical software, the CBA-RHA combination at a mass ratio of 46% CBA, 32% RHA with 22% WGS gave properties at maximum desirability of 17.6 MPa compressive strength, 1640 kg/m3 volumetric weight, 273 kg/m3 water absorption, 28 MPa compressive strength after high temperature exposure (1000oC for 2 hours) with 4.4% mass loss, and 0.578 W/m-K thermal conductivity. On a performance basis, even as the geopolymers are formed as paste, these properties fall within the standards for lightweight OPC based-concrete with strength requirements for residential buildings. The low thermal conductivity and higher strength after high temperature exposure vis-à-vis OPC are additional advantages for consideration. © 2015, Gadjah Mada University. All rights reserved.
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author Kalaw, Martin Ernesto L.
Culaba, Alvin B.
Nguyen, Hoc Thang
Nguyen, Khoi
Hinode, Hirofumi
Kurniawan, Winarto
Gallardo, Susan M.
Promentilla, Michael Angelo B.
author_facet Kalaw, Martin Ernesto L.
Culaba, Alvin B.
Nguyen, Hoc Thang
Nguyen, Khoi
Hinode, Hirofumi
Kurniawan, Winarto
Gallardo, Susan M.
Promentilla, Michael Angelo B.
author_sort Kalaw, Martin Ernesto L.
title Mechanical and thermal properties of geopolymers from mixtures of coal ash and rice hull ash using water glass solution as activator
title_short Mechanical and thermal properties of geopolymers from mixtures of coal ash and rice hull ash using water glass solution as activator
title_full Mechanical and thermal properties of geopolymers from mixtures of coal ash and rice hull ash using water glass solution as activator
title_fullStr Mechanical and thermal properties of geopolymers from mixtures of coal ash and rice hull ash using water glass solution as activator
title_full_unstemmed Mechanical and thermal properties of geopolymers from mixtures of coal ash and rice hull ash using water glass solution as activator
title_sort mechanical and thermal properties of geopolymers from mixtures of coal ash and rice hull ash using water glass solution as activator
publisher Animo Repository
publishDate 2015
url https://animorepository.dlsu.edu.ph/faculty_research/2365
https://animorepository.dlsu.edu.ph/context/faculty_research/article/3364/type/native/viewcontent
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