Time Evolution of the Modulus of Elasticity of Metakaolin-Based Geopolymer
The objective of the research is to develop a new family of geopolymeric materials and to use an experimental methodology to characterize the mechanical behavior of the materials obtained by alkaline activation of metakaolin using a compound activator. The researchers also intend to study the unknow...
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MDPI AG
2023-02-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/13/4/2179 |
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| author | Adelino Lopes Sergio Lopes Manuel Fernandes |
| author_facet | Adelino Lopes Sergio Lopes Manuel Fernandes |
| author_sort | Adelino Lopes |
| collection | DOAJ |
| description | The objective of the research is to develop a new family of geopolymeric materials and to use an experimental methodology to characterize the mechanical behavior of the materials obtained by alkaline activation of metakaolin using a compound activator. The researchers also intend to study the unknown time evolution of the modulus of elasticity and the influence of the composition of the aggregates on the strength of the material. Like the material’s strength, the results have a direct influence on structural safety evaluations. For the analysis of the mechanical properties of the mixtures, different types of tests were carried out: Flexural and compression tests on parallelepipeds and compression tests on cylinders were performed to assess the main strength characteristics of metakaolin-based geopolymers. Regarding the aggregate composition, the results show that the correction of the aggregate particle size line did not improve the mechanical properties. From about 400 h of curing, at ambient temperatures, the mechanical properties of the geopolymeric material are almost invariable. The highest value of the elastic modulus of elasticity occurs around 420 h, at about 18 GPa. The modulus of elasticity is independent of test load rate as per standards, and 1.7‰ strain was observed during maximum compressive stresses in the rupture tests. Also, the secant modulus values at 60% and 80% of maximum stress are within 12% of the value at 40% of maximum stress. |
| first_indexed | 2024-03-11T09:12:51Z |
| format | Article |
| id | doaj.art-42cb88e7b2fa4210ab0a7597cec3a3f3 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-11T09:12:51Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-42cb88e7b2fa4210ab0a7597cec3a3f32023-11-16T18:52:00ZengMDPI AGApplied Sciences2076-34172023-02-01134217910.3390/app13042179Time Evolution of the Modulus of Elasticity of Metakaolin-Based GeopolymerAdelino Lopes0Sergio Lopes1Manuel Fernandes2INESC Coimbra, Department of Civil Engineering, University of Coimbra, 3030-788 Coimbra, PortugalCentre for Mechanical Engineering, Materials and Processes, Department of Civil Engineering, University of Coimbra, 3030-788 Coimbra, PortugalDCSAT Department of Health Sciences, Environment and Technologies, University of Santiago, Praia, Cape VerdeThe objective of the research is to develop a new family of geopolymeric materials and to use an experimental methodology to characterize the mechanical behavior of the materials obtained by alkaline activation of metakaolin using a compound activator. The researchers also intend to study the unknown time evolution of the modulus of elasticity and the influence of the composition of the aggregates on the strength of the material. Like the material’s strength, the results have a direct influence on structural safety evaluations. For the analysis of the mechanical properties of the mixtures, different types of tests were carried out: Flexural and compression tests on parallelepipeds and compression tests on cylinders were performed to assess the main strength characteristics of metakaolin-based geopolymers. Regarding the aggregate composition, the results show that the correction of the aggregate particle size line did not improve the mechanical properties. From about 400 h of curing, at ambient temperatures, the mechanical properties of the geopolymeric material are almost invariable. The highest value of the elastic modulus of elasticity occurs around 420 h, at about 18 GPa. The modulus of elasticity is independent of test load rate as per standards, and 1.7‰ strain was observed during maximum compressive stresses in the rupture tests. Also, the secant modulus values at 60% and 80% of maximum stress are within 12% of the value at 40% of maximum stress.https://www.mdpi.com/2076-3417/13/4/2179experimental studymetakaolingeopolymermodulus of elasticitystrengthtime evolution |
| spellingShingle | Adelino Lopes Sergio Lopes Manuel Fernandes Time Evolution of the Modulus of Elasticity of Metakaolin-Based Geopolymer Applied Sciences experimental study metakaolin geopolymer modulus of elasticity strength time evolution |
| title | Time Evolution of the Modulus of Elasticity of Metakaolin-Based Geopolymer |
| title_full | Time Evolution of the Modulus of Elasticity of Metakaolin-Based Geopolymer |
| title_fullStr | Time Evolution of the Modulus of Elasticity of Metakaolin-Based Geopolymer |
| title_full_unstemmed | Time Evolution of the Modulus of Elasticity of Metakaolin-Based Geopolymer |
| title_short | Time Evolution of the Modulus of Elasticity of Metakaolin-Based Geopolymer |
| title_sort | time evolution of the modulus of elasticity of metakaolin based geopolymer |
| topic | experimental study metakaolin geopolymer modulus of elasticity strength time evolution |
| url | https://www.mdpi.com/2076-3417/13/4/2179 |
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