Synthesis of Aragonite Whiskers by Co-Carbonation of Waste Magnesia Slag and Magnesium Sulfate: Enhancing Microstructure and Mechanical Properties of Portland Cement Paste

This study focused on the synthesis of aragonite whiskers through a synergistic wet carbonation technology utilizing waste magnesia slag (MS) and magnesium sulfate (MgSO4), aiming to improve the microstructure and mechanical properties of ordinary Portland cement (OPC) paste. The influence of MgSO4...

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Published inBuildings (Basel) Vol. 13; no. 11; p. 2888
Main Authors Ye, Junhao, Liu, Songhui, Fang, Jingrui, Zhang, Haibo, Zhu, Jianping, Guan, Xuemao
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.11.2023
Subjects
Aragonite
aragonite microfibers
Calcite crystals
Calcium carbonate
Carbon dioxide
Carbon dioxide emissions
Carbon dioxide fixation
Carbon sequestration
Carbonation
Cement
Cement industry
Cement paste
Compressive strength
Crack propagation
Crystals
Emissions
Environmental protection
High aspect ratio
Hydration
Magnesium
magnesium slag
Magnesium sulfate
Mechanical properties
Microfibers
Microstructure
Morphology
Phase composition
Porosity
Portland cement
Portland cements
Raw materials
Slag
Sulfates
Sustainable development
Synthesis
wet carbonation
China
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Abstract This study focused on the synthesis of aragonite whiskers through a synergistic wet carbonation technology utilizing waste magnesia slag (MS) and magnesium sulfate (MgSO4), aiming to improve the microstructure and mechanical properties of ordinary Portland cement (OPC) paste. The influence of MgSO4 concentration on the wet carbonation process, phase composition, and microstructure of MS was investigated. Furthermore, the effect of incorporating carbonated MS (C-MS) on the mechanical properties and microstructure of Portland cement paste was evaluated. Results showed that appropriate MgSO4 concentrations favored aragonite whisker formation. A concentration of 0.075 M MgSO4 yielded 86.6% aragonite with high aspect ratio nanofibers. Incorporating 5% of this C-MS into OPC increased the seven-day compressive strength by 37.5% compared to the control OPC paste. The improvement was attributed to accelerated hydration and reduced porosity by the filling effect and microfiber reinforcement of aragonite whiskers. MS demonstrated good CO2 sequestration capacity during carbonation. This study provides an effective method to synthesize aragonite whiskers from waste MS and use it to enhance cementitious materials while reducing CO2 emissions, which is valuable for the development of a sustainable cement industry.
AbstractList This study focused on the synthesis of aragonite whiskers through a synergistic wet carbonation technology utilizing waste magnesia slag (MS) and magnesium sulfate (MgSO[sub.4]), aiming to improve the microstructure and mechanical properties of ordinary Portland cement (OPC) paste. The influence of MgSO[sub.4] concentration on the wet carbonation process, phase composition, and microstructure of MS was investigated. Furthermore, the effect of incorporating carbonated MS (C-MS) on the mechanical properties and microstructure of Portland cement paste was evaluated. Results showed that appropriate MgSO[sub.4] concentrations favored aragonite whisker formation. A concentration of 0.075 M MgSO[sub.4] yielded 86.6% aragonite with high aspect ratio nanofibers. Incorporating 5% of this C-MS into OPC increased the seven-day compressive strength by 37.5% compared to the control OPC paste. The improvement was attributed to accelerated hydration and reduced porosity by the filling effect and microfiber reinforcement of aragonite whiskers. MS demonstrated good CO[sub.2] sequestration capacity during carbonation. This study provides an effective method to synthesize aragonite whiskers from waste MS and use it to enhance cementitious materials while reducing CO[sub.2] emissions, which is valuable for the development of a sustainable cement industry.
This study focused on the synthesis of aragonite whiskers through a synergistic wet carbonation technology utilizing waste magnesia slag (MS) and magnesium sulfate (MgSO4), aiming to improve the microstructure and mechanical properties of ordinary Portland cement (OPC) paste. The influence of MgSO4 concentration on the wet carbonation process, phase composition, and microstructure of MS was investigated. Furthermore, the effect of incorporating carbonated MS (C-MS) on the mechanical properties and microstructure of Portland cement paste was evaluated. Results showed that appropriate MgSO4 concentrations favored aragonite whisker formation. A concentration of 0.075 M MgSO4 yielded 86.6% aragonite with high aspect ratio nanofibers. Incorporating 5% of this C-MS into OPC increased the seven-day compressive strength by 37.5% compared to the control OPC paste. The improvement was attributed to accelerated hydration and reduced porosity by the filling effect and microfiber reinforcement of aragonite whiskers. MS demonstrated good CO2 sequestration capacity during carbonation. This study provides an effective method to synthesize aragonite whiskers from waste MS and use it to enhance cementitious materials while reducing CO2 emissions, which is valuable for the development of a sustainable cement industry.
Audience Academic
Author Fang, Jingrui
Liu, Songhui
Zhu, Jianping
Ye, Junhao
Guan, Xuemao
Zhang, Haibo
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Snippet This study focused on the synthesis of aragonite whiskers through a synergistic wet carbonation technology utilizing waste magnesia slag (MS) and magnesium...
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SubjectTerms Aragonite
aragonite microfibers
Calcite crystals
Calcium carbonate
Carbon dioxide
Carbon dioxide emissions
Carbon dioxide fixation
Carbon sequestration
Carbonation
Cement
Cement industry
Cement paste
Compressive strength
Crack propagation
Crystals
Emissions
Environmental protection
High aspect ratio
Hydration
Magnesium
magnesium slag
Magnesium sulfate
Mechanical properties
Microfibers
Microstructure
Morphology
Phase composition
Porosity
Portland cement
Portland cements
Raw materials
Slag
Sulfates
Sustainable development
Synthesis
wet carbonation
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Title Synthesis of Aragonite Whiskers by Co-Carbonation of Waste Magnesia Slag and Magnesium Sulfate: Enhancing Microstructure and Mechanical Properties of Portland Cement Paste
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