Rheological Properties and Early-Age Microstructure of Cement Pastes with Limestone Powder, Redispersible Polymer Powder and Cellulose Ether
In order to study the synergistic effects of organic and inorganic thickening agents on the rheological properties of cement paste, the rheological parameters, thixotropy cement-paste containing limestone powder (LP), re-dispersible polymer powder (RPP), and hydroxypropyl methylcellulose ether (HPMC...
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MDPI AG
2022-04-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/9/3159 |
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| author | Kaiwen Feng Zhanjun Xu Weizheng Zhang Kunlin Ma Jingtao Shen Mingwen Hu |
| author_facet | Kaiwen Feng Zhanjun Xu Weizheng Zhang Kunlin Ma Jingtao Shen Mingwen Hu |
| author_sort | Kaiwen Feng |
| collection | DOAJ |
| description | In order to study the synergistic effects of organic and inorganic thickening agents on the rheological properties of cement paste, the rheological parameters, thixotropy cement-paste containing limestone powder (LP), re-dispersible polymer powder (RPP), and hydroxypropyl methylcellulose ether (HPMC) were investigated using the Anton Paar MCR 102 rheometer at different resting times. The early-age hydration process, hydration products, and microstructure were also analyzed with scanning electron microscopy (SEM) and thermogravimetry analyses (TGA). The results showed that the addition of LP, RPP, and HPMC affected the rheological properties of cement paste, but the thickening mechanism between organic and inorganic thickening agents was different. The small amount of LP increased the plastic viscosity but decreased the yield stress of cement paste due to its dense filling effect. Adding 1% of RPP improved the thixotropic property of cement paste by 50%; prolonging the standing time could improve the thixotropic performance by as much as two times. Only 0.035% HPMC added to the cement paste increased the plastic viscosity by 20%, while the yield stress increased nearly twice. The more HPMC added, the more significant effect it showed. Cement paste compounds with LP, RPP, and HPMC balanced the yield stress and plastic viscosity and improved the thixotropy. The C-L6-R1.0-H0.035 paste presented as a pseudoplastic, its rheological indexes were close to one, and it was hardly affected by the resting time. The composite superposition effect of organic and inorganic thickening agents reduced the impact of resting time for all pastes. As the organic thickening component inhibited the hydration more than the LP promoted the hydration of the cement paste, indicating that the C-L6-R1.0-H0.035 paste remained in the particle fusion stage after curing for three days, as shown by the SEM images. |
| first_indexed | 2024-03-10T03:58:51Z |
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| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T03:58:51Z |
| publishDate | 2022-04-01 |
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| spelling | doaj.art-c1c00438f07c4b7e81d24653981dabed2023-11-23T08:39:06ZengMDPI AGMaterials1996-19442022-04-01159315910.3390/ma15093159Rheological Properties and Early-Age Microstructure of Cement Pastes with Limestone Powder, Redispersible Polymer Powder and Cellulose EtherKaiwen Feng0Zhanjun Xu1Weizheng Zhang2Kunlin Ma3Jingtao Shen4Mingwen Hu5School of Civil Engineering, Central South University, Changsha 410075, ChinaHunan Zhongda Design Institution Co., Ltd., Changsha 410075, ChinaHunan Zhongda Design Institution Co., Ltd., Changsha 410075, ChinaSchool of Civil Engineering, Central South University, Changsha 410075, ChinaChina Railway Urban Construction Group Co., Ltd., Changsha 410208, ChinaChina Railway Urban Construction Group Co., Ltd., Changsha 410208, ChinaIn order to study the synergistic effects of organic and inorganic thickening agents on the rheological properties of cement paste, the rheological parameters, thixotropy cement-paste containing limestone powder (LP), re-dispersible polymer powder (RPP), and hydroxypropyl methylcellulose ether (HPMC) were investigated using the Anton Paar MCR 102 rheometer at different resting times. The early-age hydration process, hydration products, and microstructure were also analyzed with scanning electron microscopy (SEM) and thermogravimetry analyses (TGA). The results showed that the addition of LP, RPP, and HPMC affected the rheological properties of cement paste, but the thickening mechanism between organic and inorganic thickening agents was different. The small amount of LP increased the plastic viscosity but decreased the yield stress of cement paste due to its dense filling effect. Adding 1% of RPP improved the thixotropic property of cement paste by 50%; prolonging the standing time could improve the thixotropic performance by as much as two times. Only 0.035% HPMC added to the cement paste increased the plastic viscosity by 20%, while the yield stress increased nearly twice. The more HPMC added, the more significant effect it showed. Cement paste compounds with LP, RPP, and HPMC balanced the yield stress and plastic viscosity and improved the thixotropy. The C-L6-R1.0-H0.035 paste presented as a pseudoplastic, its rheological indexes were close to one, and it was hardly affected by the resting time. The composite superposition effect of organic and inorganic thickening agents reduced the impact of resting time for all pastes. As the organic thickening component inhibited the hydration more than the LP promoted the hydration of the cement paste, indicating that the C-L6-R1.0-H0.035 paste remained in the particle fusion stage after curing for three days, as shown by the SEM images.https://www.mdpi.com/1996-1944/15/9/3159rheologymicrostructurecement-based materialorganic and inorganic thickening agentcomplementary effect |
| spellingShingle | Kaiwen Feng Zhanjun Xu Weizheng Zhang Kunlin Ma Jingtao Shen Mingwen Hu Rheological Properties and Early-Age Microstructure of Cement Pastes with Limestone Powder, Redispersible Polymer Powder and Cellulose Ether Materials rheology microstructure cement-based material organic and inorganic thickening agent complementary effect |
| title | Rheological Properties and Early-Age Microstructure of Cement Pastes with Limestone Powder, Redispersible Polymer Powder and Cellulose Ether |
| title_full | Rheological Properties and Early-Age Microstructure of Cement Pastes with Limestone Powder, Redispersible Polymer Powder and Cellulose Ether |
| title_fullStr | Rheological Properties and Early-Age Microstructure of Cement Pastes with Limestone Powder, Redispersible Polymer Powder and Cellulose Ether |
| title_full_unstemmed | Rheological Properties and Early-Age Microstructure of Cement Pastes with Limestone Powder, Redispersible Polymer Powder and Cellulose Ether |
| title_short | Rheological Properties and Early-Age Microstructure of Cement Pastes with Limestone Powder, Redispersible Polymer Powder and Cellulose Ether |
| title_sort | rheological properties and early age microstructure of cement pastes with limestone powder redispersible polymer powder and cellulose ether |
| topic | rheology microstructure cement-based material organic and inorganic thickening agent complementary effect |
| url | https://www.mdpi.com/1996-1944/15/9/3159 |
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