Development of magnesium-silicate-hydrate (M-S-H) cement with rice husk ash

Rice husk ash (RHA) is a waste material obtained from the combustion of rice hulls. The properties of RHA, such as its crystallinity and reactivity, depend on the combustion conditions. This study investigated the use of RHA as a silica source in MgOsingle bondSiO2 samples. Two different RHA sources...

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Main Authors: Sonat, Cem, Unluer, Cise
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2020
Subjects:
MgO
Online Access:https://hdl.handle.net/10356/144801
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1448012021-02-05T08:52:11Z Development of magnesium-silicate-hydrate (M-S-H) cement with rice husk ash Sonat, Cem Unluer, Cise School of Civil and Environmental Engineering Engineering::Civil engineering MgO Rice Husk Ash Rice husk ash (RHA) is a waste material obtained from the combustion of rice hulls. The properties of RHA, such as its crystallinity and reactivity, depend on the combustion conditions. This study investigated the use of RHA as a silica source in MgOsingle bondSiO2 samples. Two different RHA sources (crystalline and amorphous) were used in comparison to microsilica (MS), which is commonly used in MgOsingle bondSiO2 formulations to form magnesium silica hydrate (M-S-H). Isothermal calorimetry and pH measurements were used to analyze the progress of hydration. In addition to compressive strength measurements, microstructural analysis was performed via XRD, TG/DTG, FTIR and FESEM. Samples containing amorphous RHA as the silica source achieved the highest compressive strengths at early ages (34 MPa at 7 days), whereas those containing MS revealed the highest strengths in the long term (47 MPa at 56 days). This was in line with the faster dissolution rate of amorphous RHA in comparison to MS, as observed in pH measurements. The formation of M-S-H was clearly observed in all samples containing amorphous RHA and/or MS. The use of crystalline RHA led to low strengths, which was provided by brucite in the absence of M-S-H. Combination of amorphous RHA with MgO resulted in M-S-H formation, which was accompanied with a notable mechanical performance. Utilization of amorphous RHA in MgO systems could not only lead to strength gain, but also bring environmental and economic benefits. Singapore-MIT Alliance for Research and Technology (SMART) Accepted version The authors would like to acknowledge the financial support from the Singapore-MIT Alliance for Research and Technology (SMART) Innovation Centre (ING1510112-ENG (IGN)) for the completion of this research project. 2020-11-25T02:23:45Z 2020-11-25T02:23:45Z 2019 Journal Article Sonat, C., & Unluer, C. (2019). Development of magnesium-silicate-hydrate (M-S-H) cement with rice husk ash. Journal of Cleaner Production, 211, 787–803. doi:10.1016/j.jclepro.2018.11.246 0959-6526 https://hdl.handle.net/10356/144801 10.1016/j.jclepro.2018.11.246 211 787 803 en Journal of Cleaner Production © 2018 Elsevier Ltd. All rights reserved. This paper was published in Journal of Cleaner Production and is made available with permission of Elsevier Ltd. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Civil engineering
MgO
Rice Husk Ash
spellingShingle Engineering::Civil engineering
MgO
Rice Husk Ash
Sonat, Cem
Unluer, Cise
Development of magnesium-silicate-hydrate (M-S-H) cement with rice husk ash
description Rice husk ash (RHA) is a waste material obtained from the combustion of rice hulls. The properties of RHA, such as its crystallinity and reactivity, depend on the combustion conditions. This study investigated the use of RHA as a silica source in MgOsingle bondSiO2 samples. Two different RHA sources (crystalline and amorphous) were used in comparison to microsilica (MS), which is commonly used in MgOsingle bondSiO2 formulations to form magnesium silica hydrate (M-S-H). Isothermal calorimetry and pH measurements were used to analyze the progress of hydration. In addition to compressive strength measurements, microstructural analysis was performed via XRD, TG/DTG, FTIR and FESEM. Samples containing amorphous RHA as the silica source achieved the highest compressive strengths at early ages (34 MPa at 7 days), whereas those containing MS revealed the highest strengths in the long term (47 MPa at 56 days). This was in line with the faster dissolution rate of amorphous RHA in comparison to MS, as observed in pH measurements. The formation of M-S-H was clearly observed in all samples containing amorphous RHA and/or MS. The use of crystalline RHA led to low strengths, which was provided by brucite in the absence of M-S-H. Combination of amorphous RHA with MgO resulted in M-S-H formation, which was accompanied with a notable mechanical performance. Utilization of amorphous RHA in MgO systems could not only lead to strength gain, but also bring environmental and economic benefits.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Sonat, Cem
Unluer, Cise
format Article
author Sonat, Cem
Unluer, Cise
author_sort Sonat, Cem
title Development of magnesium-silicate-hydrate (M-S-H) cement with rice husk ash
title_short Development of magnesium-silicate-hydrate (M-S-H) cement with rice husk ash
title_full Development of magnesium-silicate-hydrate (M-S-H) cement with rice husk ash
title_fullStr Development of magnesium-silicate-hydrate (M-S-H) cement with rice husk ash
title_full_unstemmed Development of magnesium-silicate-hydrate (M-S-H) cement with rice husk ash
title_sort development of magnesium-silicate-hydrate (m-s-h) cement with rice husk ash
publishDate 2020
url https://hdl.handle.net/10356/144801
_version_ 1692012927842779136