PREPARATION OF HYDROGEL PARAFFIN MICROCAPSULES AND ITS EFFECT ON THE SHRINKAGE OF CEMENT MORTARS
In an attempt to solve the uncontrollable water absorption of a superabsorbent polymer (SAP), microcapsules (MPCP), with calcium alginate and paraffin powder as the main raw materials, were prepared. The structure and water absorption properties of the MPCP was characterised and its influence on the...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
University of Chemistry and Technology, Prague
2021-11-01
|
| Series: | Ceramics-Silikáty |
| Subjects: | |
| Online Access: |
http://www.ceramics-silikaty.cz/index.php?page=cs_detail_doi&id=1428
|
| _version_ | 1797676980897841152 |
|---|---|
| author | Xiao-dong Jiao Jian-ping Xiong Zhang Yang-peng Li Bi-yun Xie Zheng-zhuan Liu Wei-dong Feng Ming-zhu |
| author_facet | Xiao-dong Jiao Jian-ping Xiong Zhang Yang-peng Li Bi-yun Xie Zheng-zhuan Liu Wei-dong Feng Ming-zhu |
| author_sort | Xiao-dong Jiao |
| collection | DOAJ |
| description | In an attempt to solve the uncontrollable water absorption of a superabsorbent polymer (SAP), microcapsules (MPCP), with calcium alginate and paraffin powder as the main raw materials, were prepared. The structure and water absorption properties of the MPCP was characterised and its influence on the shrinkage performance of a cement mortar was studied. The shrinkage-reducing mechanism of the MPCP was analysed through the heat of cement hydration, pore structure and relative humidity (RH) of the cement mortar. The results show that the MPCP particles are based on a calcium alginate network skeleton structure with a paraffin wax filling the round particles in the skeleton cracks, where its content determines the water absorption of the MPCP. The MPCP exhibited a good internal curing effect. The internal RH of the mortar containing the pre-absorbed MPCP basically changed as much as that containing the pre-absorbed SAP. The shrinkage of the MPCP-containing mortar reduced by more than 8% compared with the SAP-containing mortar after 7 days. The reason was that the MPCP absorbed the heat of the cement hydration and reduced the shrinkage caused by the excessive heat of the early cement hydration. In addition, because the water absorption of the MPCP is controllable, the MPCP exhibits little effect on the pore structure of cement-based materials. Therefore, the compressive strength of the cement mortar with the pre-absorbed MPCP content is 39 times that of the pre-absorbed SAP, which was only 2.3 MPa lower than that of the corresponding SAP-containing cement mortar. |
| first_indexed | 2024-03-11T22:38:18Z |
| format | Article |
| id | doaj.art-ce50e1b79e2d4799af843e94e725f9b4 |
| institution | Directory Open Access Journal |
| issn | 0862-5468 1804-5847 |
| language | English |
| last_indexed | 2024-03-11T22:38:18Z |
| publishDate | 2021-11-01 |
| publisher | University of Chemistry and Technology, Prague |
| record_format | Article |
| series | Ceramics-Silikáty |
| spelling | doaj.art-ce50e1b79e2d4799af843e94e725f9b42023-09-22T11:46:41ZengUniversity of Chemistry and Technology, PragueCeramics-Silikáty0862-54681804-58472021-11-0165435436210.13168/cs.2021.003710.13168/cs.2021.0037.20230922114607PREPARATION OF HYDROGEL PARAFFIN MICROCAPSULES AND ITS EFFECT ON THE SHRINKAGE OF CEMENT MORTARSXiao-dong Jiao0Jian-ping Xiong1Zhang Yang-peng2Li Bi-yun3Xie Zheng-zhuan4Liu Wei-dong5Feng Ming-zhu6 Guangxi Key Lab of Road Structure and Materials, Nanning 53007, China Guangxi Key Lab of Road Structure and Materials, Nanning 53007, China Guangxi Key Lab of Road Structure and Materials, Nanning 53007, China Guangxi Key Lab of Road Structure and Materials, Nanning 53007, China Guangxi Key Lab of Road Structure and Materials, Nanning 53007, China Guangxi Key Lab of Road Structure and Materials, Nanning 53007, China Guangxi Key Lab of Road Structure and Materials, Nanning 53007, China In an attempt to solve the uncontrollable water absorption of a superabsorbent polymer (SAP), microcapsules (MPCP), with calcium alginate and paraffin powder as the main raw materials, were prepared. The structure and water absorption properties of the MPCP was characterised and its influence on the shrinkage performance of a cement mortar was studied. The shrinkage-reducing mechanism of the MPCP was analysed through the heat of cement hydration, pore structure and relative humidity (RH) of the cement mortar. The results show that the MPCP particles are based on a calcium alginate network skeleton structure with a paraffin wax filling the round particles in the skeleton cracks, where its content determines the water absorption of the MPCP. The MPCP exhibited a good internal curing effect. The internal RH of the mortar containing the pre-absorbed MPCP basically changed as much as that containing the pre-absorbed SAP. The shrinkage of the MPCP-containing mortar reduced by more than 8% compared with the SAP-containing mortar after 7 days. The reason was that the MPCP absorbed the heat of the cement hydration and reduced the shrinkage caused by the excessive heat of the early cement hydration. In addition, because the water absorption of the MPCP is controllable, the MPCP exhibits little effect on the pore structure of cement-based materials. Therefore, the compressive strength of the cement mortar with the pre-absorbed MPCP content is 39 times that of the pre-absorbed SAP, which was only 2.3 MPa lower than that of the corresponding SAP-containing cement mortar. http://www.ceramics-silikaty.cz/index.php?page=cs_detail_doi&id=1428 hydrogel paraffin microcapsules cement-based materials shrinkage properties cement hydration pore structure |
| spellingShingle | Xiao-dong Jiao Jian-ping Xiong Zhang Yang-peng Li Bi-yun Xie Zheng-zhuan Liu Wei-dong Feng Ming-zhu PREPARATION OF HYDROGEL PARAFFIN MICROCAPSULES AND ITS EFFECT ON THE SHRINKAGE OF CEMENT MORTARS Ceramics-Silikáty hydrogel paraffin microcapsules cement-based materials shrinkage properties cement hydration pore structure |
| title | PREPARATION OF HYDROGEL PARAFFIN MICROCAPSULES AND ITS EFFECT ON THE SHRINKAGE OF CEMENT MORTARS |
| title_full | PREPARATION OF HYDROGEL PARAFFIN MICROCAPSULES AND ITS EFFECT ON THE SHRINKAGE OF CEMENT MORTARS |
| title_fullStr | PREPARATION OF HYDROGEL PARAFFIN MICROCAPSULES AND ITS EFFECT ON THE SHRINKAGE OF CEMENT MORTARS |
| title_full_unstemmed | PREPARATION OF HYDROGEL PARAFFIN MICROCAPSULES AND ITS EFFECT ON THE SHRINKAGE OF CEMENT MORTARS |
| title_short | PREPARATION OF HYDROGEL PARAFFIN MICROCAPSULES AND ITS EFFECT ON THE SHRINKAGE OF CEMENT MORTARS |
| title_sort | preparation of hydrogel paraffin microcapsules and its effect on the shrinkage of cement mortars |
| topic | hydrogel paraffin microcapsules cement-based materials shrinkage properties cement hydration pore structure |
| url |
http://www.ceramics-silikaty.cz/index.php?page=cs_detail_doi&id=1428
|
| work_keys_str_mv | AT xiaodongjiao preparationofhydrogelparaffinmicrocapsulesanditseffectontheshrinkageofcementmortars AT jianpingxiong preparationofhydrogelparaffinmicrocapsulesanditseffectontheshrinkageofcementmortars AT zhangyangpeng preparationofhydrogelparaffinmicrocapsulesanditseffectontheshrinkageofcementmortars AT libiyun preparationofhydrogelparaffinmicrocapsulesanditseffectontheshrinkageofcementmortars AT xiezhengzhuan preparationofhydrogelparaffinmicrocapsulesanditseffectontheshrinkageofcementmortars AT liuweidong preparationofhydrogelparaffinmicrocapsulesanditseffectontheshrinkageofcementmortars AT fengmingzhu preparationofhydrogelparaffinmicrocapsulesanditseffectontheshrinkageofcementmortars |