Preparation of shrinkage-free alkali-activated slag material using MgO as both the activator and the expansive agent
Alkali-activated slag (AAS) materials activated by NaOH or waterglass has been long-term criticized for the developed substantial shrinkage. To this regard, this paper explored MgO as both an activator and an expansive agent to prepare shrinkage-free AAS. The setting time, mechanical strength, pore...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Consejo Superior de Investigaciones Científicas
2023-03-01
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| Series: | Materiales de Construccion |
| Subjects: | |
| Online Access: | https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/3493 |
| _version_ | 1797866533905498112 |
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| author | P. Chen Q. Chen Y. Fang C. Wang X. Wang J. Li Y. Wang |
| author_facet | P. Chen Q. Chen Y. Fang C. Wang X. Wang J. Li Y. Wang |
| author_sort | P. Chen |
| collection | DOAJ |
| description |
Alkali-activated slag (AAS) materials activated by NaOH or waterglass has been long-term criticized for the developed substantial shrinkage. To this regard, this paper explored MgO as both an activator and an expansive agent to prepare shrinkage-free AAS. The setting time, mechanical strength, pore structure, autogenous shrinkage, drying shrinkage, and hydration products of MgO-activated AAS were studied. Experimental results confirmed that MgO can effectively mitigate the autogenous shrinkage and drying shrinkage of AAS via the expansive deformation caused by Mg(OH)2. Generally, AAS with a higher dosage of MgO developed less shrinkages and refiner pore structures with more gel pores. An optimal dosage of 9% MgO is recommended to prepare AAS with near zero shrinkage and the highest flexural strength.
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| first_indexed | 2024-04-09T23:25:41Z |
| format | Article |
| id | doaj.art-e5ab29b37e864fa18f8051152cbbfbe3 |
| institution | Directory Open Access Journal |
| issn | 0465-2746 1988-3226 |
| language | English |
| last_indexed | 2024-04-09T23:25:41Z |
| publishDate | 2023-03-01 |
| publisher | Consejo Superior de Investigaciones Científicas |
| record_format | Article |
| series | Materiales de Construccion |
| spelling | doaj.art-e5ab29b37e864fa18f8051152cbbfbe32023-03-21T10:59:58ZengConsejo Superior de Investigaciones CientíficasMateriales de Construccion0465-27461988-32262023-03-017334910.3989/mc.2023.297022Preparation of shrinkage-free alkali-activated slag material using MgO as both the activator and the expansive agentP. Chen0Q. Chen1Y. Fang2C. Wang3X. Wang4J. Li5Y. Wang6School of Civil Engineering and Architecture, Anhui University of Science and Technology - Institute of Environment-friendly Materials and Occupational Health, Anhui University of Science and Technology - Anhui Hongchang New Material Co. LtdCollege of Mechanics and Materials, Hohai UniversityCollege of Mechanics and Materials, Hohai UniversitySchool of Civil Engineering and Architecture, Anhui University of Science and TechnologySchool of Civil Engineering and Architecture, Anhui University of Science and TechnologySchool of Civil Engineering and Architecture, Anhui University of Science and TechnologySchool of Civil Engineering and Architecture, Anhui University of Science and Technology Alkali-activated slag (AAS) materials activated by NaOH or waterglass has been long-term criticized for the developed substantial shrinkage. To this regard, this paper explored MgO as both an activator and an expansive agent to prepare shrinkage-free AAS. The setting time, mechanical strength, pore structure, autogenous shrinkage, drying shrinkage, and hydration products of MgO-activated AAS were studied. Experimental results confirmed that MgO can effectively mitigate the autogenous shrinkage and drying shrinkage of AAS via the expansive deformation caused by Mg(OH)2. Generally, AAS with a higher dosage of MgO developed less shrinkages and refiner pore structures with more gel pores. An optimal dosage of 9% MgO is recommended to prepare AAS with near zero shrinkage and the highest flexural strength. https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/3493Alkali-activated slagMgOAutogenous shrinkageDrying shrinkage |
| spellingShingle | P. Chen Q. Chen Y. Fang C. Wang X. Wang J. Li Y. Wang Preparation of shrinkage-free alkali-activated slag material using MgO as both the activator and the expansive agent Materiales de Construccion Alkali-activated slag MgO Autogenous shrinkage Drying shrinkage |
| title | Preparation of shrinkage-free alkali-activated slag material using MgO as both the activator and the expansive agent |
| title_full | Preparation of shrinkage-free alkali-activated slag material using MgO as both the activator and the expansive agent |
| title_fullStr | Preparation of shrinkage-free alkali-activated slag material using MgO as both the activator and the expansive agent |
| title_full_unstemmed | Preparation of shrinkage-free alkali-activated slag material using MgO as both the activator and the expansive agent |
| title_short | Preparation of shrinkage-free alkali-activated slag material using MgO as both the activator and the expansive agent |
| title_sort | preparation of shrinkage free alkali activated slag material using mgo as both the activator and the expansive agent |
| topic | Alkali-activated slag MgO Autogenous shrinkage Drying shrinkage |
| url | https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/3493 |
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