The Effect of Secondary Aluminum Ash on the Properties of Reactive Powder Concrete
Secondary aluminum ash is a kind of common solid waste which will pollute the environment without any treatment. In this study, the influence of secondary aluminum ash on the rheological properties and the initial setting time of fresh reactive powder concrete (RPC) are researched. Meanwhile, the me...
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MDPI AG
2023-07-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/15/5265 |
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| author | Wenyu Xu Hui Wang Xiaoning Tian |
| author_facet | Wenyu Xu Hui Wang Xiaoning Tian |
| author_sort | Wenyu Xu |
| collection | DOAJ |
| description | Secondary aluminum ash is a kind of common solid waste which will pollute the environment without any treatment. In this study, the influence of secondary aluminum ash on the rheological properties and the initial setting time of fresh reactive powder concrete (RPC) are researched. Meanwhile, the mechanical properties and the drying shrinkage rates of RPC with the secondary aluminum ash are determined. The electrical parameters of RPC with the secondary aluminum ash are measured. Scanning electron microscopy is obtained to reflect the internal structure of RPC. Results show that the addition of secondary aluminum ash can lead to decreasing the fluidity and increase the yield shear stress of fresh RPC paste by varying rates of 16.1% and 58.3%, respectively. The addition of secondary aluminum ash can decrease the flexural and compressive strengths of RPC cured for 1 day by the decreasing rates of 0~18.7% and 0~19.3%. When the curing age is 28 days, the flexural and compressive strengths of RPC are increased by 0~9.1% and 0~19.1% with adding the secondary aluminum ash. The secondary aluminum ash can promote the condensation of RPC. The addition of the secondary aluminum ash can decrease the electrical resistance of RPC by an order of magnitude. The relationship between the electrical resistance and the electrical reactance fits the quadratic function equation. The electrical resistance of the pore solution increases in the form of a quadratic function with the mass ratio of the secondary aluminum ash. The dry shrinkage rates of RPC cured for 1 day and 28 days are decreased by 0~36.4% and 0~41.3% with the increasing dosages of secondary aluminum ash. As obtained from the microscopic testing results, the secondary aluminum ash can improve the compactness of hydration products. |
| first_indexed | 2024-03-11T00:23:24Z |
| format | Article |
| id | doaj.art-66200af017f244ffa1719f7a8e7a958a |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T00:23:24Z |
| publishDate | 2023-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-66200af017f244ffa1719f7a8e7a958a2023-11-18T23:11:02ZengMDPI AGMaterials1996-19442023-07-011615526510.3390/ma16155265The Effect of Secondary Aluminum Ash on the Properties of Reactive Powder ConcreteWenyu Xu0Hui Wang1Xiaoning Tian2Nanjing University of Science and Technology ZiJin College, Nanjing 210023, ChinaSchool of Civil Engineering and Geographic Environment, Ningbo University, Ningbo 315000, ChinaSchool of Civil Engineering and Geographic Environment, Ningbo University, Ningbo 315000, ChinaSecondary aluminum ash is a kind of common solid waste which will pollute the environment without any treatment. In this study, the influence of secondary aluminum ash on the rheological properties and the initial setting time of fresh reactive powder concrete (RPC) are researched. Meanwhile, the mechanical properties and the drying shrinkage rates of RPC with the secondary aluminum ash are determined. The electrical parameters of RPC with the secondary aluminum ash are measured. Scanning electron microscopy is obtained to reflect the internal structure of RPC. Results show that the addition of secondary aluminum ash can lead to decreasing the fluidity and increase the yield shear stress of fresh RPC paste by varying rates of 16.1% and 58.3%, respectively. The addition of secondary aluminum ash can decrease the flexural and compressive strengths of RPC cured for 1 day by the decreasing rates of 0~18.7% and 0~19.3%. When the curing age is 28 days, the flexural and compressive strengths of RPC are increased by 0~9.1% and 0~19.1% with adding the secondary aluminum ash. The secondary aluminum ash can promote the condensation of RPC. The addition of the secondary aluminum ash can decrease the electrical resistance of RPC by an order of magnitude. The relationship between the electrical resistance and the electrical reactance fits the quadratic function equation. The electrical resistance of the pore solution increases in the form of a quadratic function with the mass ratio of the secondary aluminum ash. The dry shrinkage rates of RPC cured for 1 day and 28 days are decreased by 0~36.4% and 0~41.3% with the increasing dosages of secondary aluminum ash. As obtained from the microscopic testing results, the secondary aluminum ash can improve the compactness of hydration products.https://www.mdpi.com/1996-1944/16/15/5265secondary aluminum ashrheological propertiesNaCl actionthermogravimetric analysisX-ray diffraction spectrum |
| spellingShingle | Wenyu Xu Hui Wang Xiaoning Tian The Effect of Secondary Aluminum Ash on the Properties of Reactive Powder Concrete Materials secondary aluminum ash rheological properties NaCl action thermogravimetric analysis X-ray diffraction spectrum |
| title | The Effect of Secondary Aluminum Ash on the Properties of Reactive Powder Concrete |
| title_full | The Effect of Secondary Aluminum Ash on the Properties of Reactive Powder Concrete |
| title_fullStr | The Effect of Secondary Aluminum Ash on the Properties of Reactive Powder Concrete |
| title_full_unstemmed | The Effect of Secondary Aluminum Ash on the Properties of Reactive Powder Concrete |
| title_short | The Effect of Secondary Aluminum Ash on the Properties of Reactive Powder Concrete |
| title_sort | effect of secondary aluminum ash on the properties of reactive powder concrete |
| topic | secondary aluminum ash rheological properties NaCl action thermogravimetric analysis X-ray diffraction spectrum |
| url | https://www.mdpi.com/1996-1944/16/15/5265 |
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