Effect of SAP on the properties and microstructure of cement-based materials in the low humidity environment
In this study, environments of 60 % and 33 % relative humidity have been chosen to investigate the effect of internal curing of pre-absorbed superabsorbent polymers (SAPs) on the resistance of cementitious materials to the harsh environment of external drying, which will be analyzed experimentally i...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2024-07-01
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| Series: | Case Studies in Construction Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509524001529 |
| _version_ | 1797299691303469056 |
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| author | Cong Tang Rongzhen Dong Zhuo Tang Guangcheng Long Gang Ma Haixu Wang Ying Huang |
| author_facet | Cong Tang Rongzhen Dong Zhuo Tang Guangcheng Long Gang Ma Haixu Wang Ying Huang |
| author_sort | Cong Tang |
| collection | DOAJ |
| description | In this study, environments of 60 % and 33 % relative humidity have been chosen to investigate the effect of internal curing of pre-absorbed superabsorbent polymers (SAPs) on the resistance of cementitious materials to the harsh environment of external drying, which will be analyzed experimentally in terms of mechanical properties, volumetric stability, degree of hydration and pore structure. The results showed that 2‰ SAP improved the hydration of cementitious materials, enhanced the ability of the cement paste to resist low humidity environments, effectively increased the compressive strength and reduced the drying shrinkage deformation of the cement mortar. The relevant tests including FTIR, XRD and TG also prove this from multiple angles. It was also discovered that a moderate amount of pre-absorbed SAP was able to reduce the drying shrinkage of the cement mortar. However, the pore structure analysis revealed that the pre-absorbed SAP increased the cement paste porosity, leading to accelerated dissipation of pore water in the cement paste. In the end, the critical pore size (Dc) micromechanical model showed that the shrinkage reduction mechanism of the pre-absorbed SAP in low humidity environment is that the maximum pore size of the SAP group forming the meniscus during the drying process generates less shrinkage stress. |
| first_indexed | 2024-03-07T22:54:20Z |
| format | Article |
| id | doaj.art-7661d1d158884224a0baafd1e49f2da9 |
| institution | Directory Open Access Journal |
| issn | 2214-5095 |
| language | English |
| last_indexed | 2024-03-07T22:54:20Z |
| publishDate | 2024-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj.art-7661d1d158884224a0baafd1e49f2da92024-02-23T04:59:55ZengElsevierCase Studies in Construction Materials2214-50952024-07-0120e03001Effect of SAP on the properties and microstructure of cement-based materials in the low humidity environmentCong Tang0Rongzhen Dong1Zhuo Tang2Guangcheng Long3Gang Ma4Haixu Wang5Ying Huang6School of Civil Engineering, Central South University, Changsha, Hunan 410075, PR ChinaSchool of Civil Engineering, Central South University, Changsha, Hunan 410075, PR China; Corresponding author.School of Civil Engineering, Central South University, Changsha, Hunan 410075, PR ChinaSchool of Civil Engineering, Central South University, Changsha, Hunan 410075, PR ChinaSchool of Civil Engineering, Central South University, Changsha, Hunan 410075, PR ChinaSchool of Civil Engineering, Central South University, Changsha, Hunan 410075, PR ChinaDepartment of Civil Engineering, Jiangxi Science &Technology Normal University, Jiangxi 330013, PR ChinaIn this study, environments of 60 % and 33 % relative humidity have been chosen to investigate the effect of internal curing of pre-absorbed superabsorbent polymers (SAPs) on the resistance of cementitious materials to the harsh environment of external drying, which will be analyzed experimentally in terms of mechanical properties, volumetric stability, degree of hydration and pore structure. The results showed that 2‰ SAP improved the hydration of cementitious materials, enhanced the ability of the cement paste to resist low humidity environments, effectively increased the compressive strength and reduced the drying shrinkage deformation of the cement mortar. The relevant tests including FTIR, XRD and TG also prove this from multiple angles. It was also discovered that a moderate amount of pre-absorbed SAP was able to reduce the drying shrinkage of the cement mortar. However, the pore structure analysis revealed that the pre-absorbed SAP increased the cement paste porosity, leading to accelerated dissipation of pore water in the cement paste. In the end, the critical pore size (Dc) micromechanical model showed that the shrinkage reduction mechanism of the pre-absorbed SAP in low humidity environment is that the maximum pore size of the SAP group forming the meniscus during the drying process generates less shrinkage stress.http://www.sciencedirect.com/science/article/pii/S2214509524001529SAPLow humidityDrying shrinkagePore structureCritical pore size |
| spellingShingle | Cong Tang Rongzhen Dong Zhuo Tang Guangcheng Long Gang Ma Haixu Wang Ying Huang Effect of SAP on the properties and microstructure of cement-based materials in the low humidity environment Case Studies in Construction Materials SAP Low humidity Drying shrinkage Pore structure Critical pore size |
| title | Effect of SAP on the properties and microstructure of cement-based materials in the low humidity environment |
| title_full | Effect of SAP on the properties and microstructure of cement-based materials in the low humidity environment |
| title_fullStr | Effect of SAP on the properties and microstructure of cement-based materials in the low humidity environment |
| title_full_unstemmed | Effect of SAP on the properties and microstructure of cement-based materials in the low humidity environment |
| title_short | Effect of SAP on the properties and microstructure of cement-based materials in the low humidity environment |
| title_sort | effect of sap on the properties and microstructure of cement based materials in the low humidity environment |
| topic | SAP Low humidity Drying shrinkage Pore structure Critical pore size |
| url | http://www.sciencedirect.com/science/article/pii/S2214509524001529 |
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