Effects of HPMC on Workability and Mechanical Properties of Concrete Using Iron Tailings as Aggregates
Iron ore tailings (IOTs) are gradually used as building materials to solve the severe ecological and environmental problems caused by their massive accumulation. However, the bulk density of IOT as aggregate is too large, which seriously affects the concrete properties. Therefore, in this paper, the...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-10-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/14/21/6451 |
| _version_ | 1797512179020201984 |
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| author | Xiaowei Gu Xiaohui Li Weifeng Zhang Yuxin Gao Yaning Kong Jianping Liu Xinlong Zhang |
| author_facet | Xiaowei Gu Xiaohui Li Weifeng Zhang Yuxin Gao Yaning Kong Jianping Liu Xinlong Zhang |
| author_sort | Xiaowei Gu |
| collection | DOAJ |
| description | Iron ore tailings (IOTs) are gradually used as building materials to solve the severe ecological and environmental problems caused by their massive accumulation. However, the bulk density of IOT as aggregate is too large, which seriously affects the concrete properties. Therefore, in this paper, the effect of hydroxypropyl methylcellulose (HPMC) on the workability, mechanical properties, and durability of concrete prepared from IOT recycled aggregate was studied. The action mechanism of HPMC on the workability and the mechanical properties of the IOT concrete was analyzed by mercury intrusion porosimetry (MIP) and scanning electron microscope (SEM). The results show that HPMC can effectively improve the segregation problem caused by the sinking and air entrainment of IOT aggregate and improve the crack resistance of concrete with little effect on its compressive strength and electric flux. These results are due to the air-entraining thickening effect of HPMC, which improves the slurry viscosity, hinders the sinking of aggregate, and improves the workability. At the same time, HPMC film, after concrete hardening, will bridge the slurry and aggregate through physical and chemical effects, hinder the propagation of microcracks, and improve the crack resistance. |
| first_indexed | 2024-03-10T05:58:11Z |
| format | Article |
| id | doaj.art-d65c92bd91ad4dc7ba080bef9039b58b |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T05:58:11Z |
| publishDate | 2021-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-d65c92bd91ad4dc7ba080bef9039b58b2023-11-22T21:12:24ZengMDPI AGMaterials1996-19442021-10-011421645110.3390/ma14216451Effects of HPMC on Workability and Mechanical Properties of Concrete Using Iron Tailings as AggregatesXiaowei Gu0Xiaohui Li1Weifeng Zhang2Yuxin Gao3Yaning Kong4Jianping Liu5Xinlong Zhang6Science and Technology Innovation Center of Smart Water and Resource Environment, Northeastern University, Shenyang 110819, ChinaScience and Technology Innovation Center of Smart Water and Resource Environment, Northeastern University, Shenyang 110819, ChinaScience and Technology Innovation Center of Smart Water and Resource Environment, Northeastern University, Shenyang 110819, ChinaCollege of Materials Science and Engineering, Chongqing University, Chongqing 400045, ChinaChina West Construction Academy of Building Materials, Chengdu 610015, ChinaSchool of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang 110870, ChinaKey Lab of Structures Dynamic Behaviour and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150090, ChinaIron ore tailings (IOTs) are gradually used as building materials to solve the severe ecological and environmental problems caused by their massive accumulation. However, the bulk density of IOT as aggregate is too large, which seriously affects the concrete properties. Therefore, in this paper, the effect of hydroxypropyl methylcellulose (HPMC) on the workability, mechanical properties, and durability of concrete prepared from IOT recycled aggregate was studied. The action mechanism of HPMC on the workability and the mechanical properties of the IOT concrete was analyzed by mercury intrusion porosimetry (MIP) and scanning electron microscope (SEM). The results show that HPMC can effectively improve the segregation problem caused by the sinking and air entrainment of IOT aggregate and improve the crack resistance of concrete with little effect on its compressive strength and electric flux. These results are due to the air-entraining thickening effect of HPMC, which improves the slurry viscosity, hinders the sinking of aggregate, and improves the workability. At the same time, HPMC film, after concrete hardening, will bridge the slurry and aggregate through physical and chemical effects, hinder the propagation of microcracks, and improve the crack resistance.https://www.mdpi.com/1996-1944/14/21/6451HPMCiron tailingsworkabilitymechanical properties |
| spellingShingle | Xiaowei Gu Xiaohui Li Weifeng Zhang Yuxin Gao Yaning Kong Jianping Liu Xinlong Zhang Effects of HPMC on Workability and Mechanical Properties of Concrete Using Iron Tailings as Aggregates Materials HPMC iron tailings workability mechanical properties |
| title | Effects of HPMC on Workability and Mechanical Properties of Concrete Using Iron Tailings as Aggregates |
| title_full | Effects of HPMC on Workability and Mechanical Properties of Concrete Using Iron Tailings as Aggregates |
| title_fullStr | Effects of HPMC on Workability and Mechanical Properties of Concrete Using Iron Tailings as Aggregates |
| title_full_unstemmed | Effects of HPMC on Workability and Mechanical Properties of Concrete Using Iron Tailings as Aggregates |
| title_short | Effects of HPMC on Workability and Mechanical Properties of Concrete Using Iron Tailings as Aggregates |
| title_sort | effects of hpmc on workability and mechanical properties of concrete using iron tailings as aggregates |
| topic | HPMC iron tailings workability mechanical properties |
| url | https://www.mdpi.com/1996-1944/14/21/6451 |
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