Effect of water release behavior by pH-sensitive microgels on hydration, microstructure of cementitious materials
Superabsorbent polymer (SAP) has been effectively applied in cement-based materials for controllable water release to alleviate autogenous shrinkage. In this paper, a type of pH-sensitive microgel was synthesized and its water release rate in two simplified stages was investigated. To explore the wa...
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| Language: | English |
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Elsevier
2025-07-01
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| Series: | Case Studies in Construction Materials |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509525001214 |
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| author | Gengtong Zhang Huiyun Xia Dongwei Cao Huaxin Chen Weihua Li |
| author_facet | Gengtong Zhang Huiyun Xia Dongwei Cao Huaxin Chen Weihua Li |
| author_sort | Gengtong Zhang |
| collection | DOAJ |
| description | Superabsorbent polymer (SAP) has been effectively applied in cement-based materials for controllable water release to alleviate autogenous shrinkage. In this paper, a type of pH-sensitive microgel was synthesized and its water release rate in two simplified stages was investigated. To explore the water evolution and hydration characteristics of cement paste, free water content, chemical bound water and hydration heat are quantified by vacuum freeze-drying, thermogravimetry and isothermal calorimetry methods. The effects of extra water and microgel on the properties and microstructure of cement-based materials were also studied. The water absorption process of microgel in cement filtrate is slow and stable without early desorption, and the retention capability of microgel reduced the evaporation of free water. As the humidity dropped, the stored water is driven by a humidity gradient and drained almost entirely within 7 days. The addition of extra water and pH-sensitive microgel increased the total water cement ratio, thus promoting the further full hydration of cement. This is also the main factor leading to a decrease in compressive strength. Also, microgel refined the microstructure of mortar. A layer of hydration products formed around each curing area can be attributed to the slow water release of microgel. |
| format | Article |
| id | doaj-art-ac6c2b4cf1e94a7cab3cdf1183ead701 |
| institution | Kabale University |
| issn | 2214-5095 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj-art-ac6c2b4cf1e94a7cab3cdf1183ead7012025-02-05T04:32:04ZengElsevierCase Studies in Construction Materials2214-50952025-07-0122e04323Effect of water release behavior by pH-sensitive microgels on hydration, microstructure of cementitious materialsGengtong Zhang0Huiyun Xia1Dongwei Cao2Huaxin Chen3Weihua Li4College of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450046, PR China; Henan Key Laboratory of Infrastructure corrosion and protection, Zhengzhou 450046, PR ChinaCollege of Materials Science and Engineering, Chang'an University, Xi'an 710064, PR ChinaCollege of Materials Science and Engineering, Chang'an University, Xi'an 710064, PR China; CTVIC, Research Institute of Highways, Ministry of Transport, Beijing 100000, PR China; Corresponding author at: College of Materials Science and Engineering, Chang'an University, Xi'an 710064, PR China.College of Materials Science and Engineering, Chang'an University, Xi'an 710064, PR ChinaCollege of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450046, PR China; Henan Academy of Sciences, Zhengzhou 450002, PR China; Henan Key Laboratory of Infrastructure corrosion and protection, Zhengzhou 450046, PR China; Corresponding author at: College of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450046, PR China.Superabsorbent polymer (SAP) has been effectively applied in cement-based materials for controllable water release to alleviate autogenous shrinkage. In this paper, a type of pH-sensitive microgel was synthesized and its water release rate in two simplified stages was investigated. To explore the water evolution and hydration characteristics of cement paste, free water content, chemical bound water and hydration heat are quantified by vacuum freeze-drying, thermogravimetry and isothermal calorimetry methods. The effects of extra water and microgel on the properties and microstructure of cement-based materials were also studied. The water absorption process of microgel in cement filtrate is slow and stable without early desorption, and the retention capability of microgel reduced the evaporation of free water. As the humidity dropped, the stored water is driven by a humidity gradient and drained almost entirely within 7 days. The addition of extra water and pH-sensitive microgel increased the total water cement ratio, thus promoting the further full hydration of cement. This is also the main factor leading to a decrease in compressive strength. Also, microgel refined the microstructure of mortar. A layer of hydration products formed around each curing area can be attributed to the slow water release of microgel.http://www.sciencedirect.com/science/article/pii/S2214509525001214SAPPH-sensitive microgelDesorptionFree waterHydration characteristicsMicrostructure |
| spellingShingle | Gengtong Zhang Huiyun Xia Dongwei Cao Huaxin Chen Weihua Li Effect of water release behavior by pH-sensitive microgels on hydration, microstructure of cementitious materials Case Studies in Construction Materials SAP PH-sensitive microgel Desorption Free water Hydration characteristics Microstructure |
| title | Effect of water release behavior by pH-sensitive microgels on hydration, microstructure of cementitious materials |
| title_full | Effect of water release behavior by pH-sensitive microgels on hydration, microstructure of cementitious materials |
| title_fullStr | Effect of water release behavior by pH-sensitive microgels on hydration, microstructure of cementitious materials |
| title_full_unstemmed | Effect of water release behavior by pH-sensitive microgels on hydration, microstructure of cementitious materials |
| title_short | Effect of water release behavior by pH-sensitive microgels on hydration, microstructure of cementitious materials |
| title_sort | effect of water release behavior by ph sensitive microgels on hydration microstructure of cementitious materials |
| topic | SAP PH-sensitive microgel Desorption Free water Hydration characteristics Microstructure |
| url | http://www.sciencedirect.com/science/article/pii/S2214509525001214 |
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