The Impact of Fractal Gradation of Aggregate on the Mechanical and Durable Characteristics of Recycled Concrete
Properties of recycled aggregate concrete (RAC) are influenced by the composition and particle size distribution of recycled coarse aggregate (RCA). The study herein designed seven distinct groups of RACs with varying aggregate fractal dimensions (<b><i>D</i></b>) and one gro...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-08-01
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| Series: | Fractal and Fractional |
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| Online Access: | https://www.mdpi.com/2504-3110/7/9/663 |
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| author | Chang-Qing Quan Chu-Jie Jiao Wei-Zhi Chen Zhi-Cheng Xue Rui Liang Xue-Fei Chen |
| author_facet | Chang-Qing Quan Chu-Jie Jiao Wei-Zhi Chen Zhi-Cheng Xue Rui Liang Xue-Fei Chen |
| author_sort | Chang-Qing Quan |
| collection | DOAJ |
| description | Properties of recycled aggregate concrete (RAC) are influenced by the composition and particle size distribution of recycled coarse aggregate (RCA). The study herein designed seven distinct groups of RACs with varying aggregate fractal dimensions (<b><i>D</i></b>) and one group of natural concrete (NAC). The impact of <b><i>D</i></b> on the workability, compressive strength, resistance to chloride ion penetration, and carbonation resistance of RAC was measured. It was found that an increase in the D value led to a decrease in the slump and slump flow, with the compressive strength and chloride ion penetration increasing and then decreasing, and carbonation gradually declined. The optimal fractal dimension was thereby determined to be 2.547 by a strength model accommodating two parameters of <b><i>D</i></b> and the curing age. Additionally, the mass percentage of each particle size for the corresponding gradation was presented. The compressive strength and chloride permeation resistance of RAC (<b><i>D</i></b> = 1.0) relative to RAC (<b><i>D</i></b> = 2.5) was increased by 16.7% and 13.3%, respectively. Furthermore, the carbonation depth of RAC (<b><i>D</i></b> = 2.5) was comparable to that of NAC. Additionally, the carbonation resistance of RAC was influenced by both the size distribution and the degree of natural carbonation of RCA, resulting in four distinct features relative to NAC. It is thereby feasible to enhance RAC performance through the manipulation of RCA’s fractal dimensions. |
| first_indexed | 2024-03-10T22:44:03Z |
| format | Article |
| id | doaj.art-237f05ac683b4d099e29047e8d8b0724 |
| institution | Directory Open Access Journal |
| issn | 2504-3110 |
| language | English |
| last_indexed | 2024-03-10T22:44:03Z |
| publishDate | 2023-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Fractal and Fractional |
| spelling | doaj.art-237f05ac683b4d099e29047e8d8b07242023-11-19T10:48:28ZengMDPI AGFractal and Fractional2504-31102023-08-017966310.3390/fractalfract7090663The Impact of Fractal Gradation of Aggregate on the Mechanical and Durable Characteristics of Recycled ConcreteChang-Qing Quan0Chu-Jie Jiao1Wei-Zhi Chen2Zhi-Cheng Xue3Rui Liang4Xue-Fei Chen5School of Civil Engineering, Guangzhou University, Guangzhou 510006, ChinaSchool of Civil Engineering, Guangzhou University, Guangzhou 510006, ChinaSchool of Civil Engineering, Guangzhou University, Guangzhou 510006, ChinaArchitecture and Civil Engineering Institute, Guangdong University of Petrochemical Technology, Maoming 525000, ChinaZhuhai UM Science &Technology Research Institute, Zhuhai 519031, ChinaSchool of Civil Engineering, Guangzhou University, Guangzhou 510006, ChinaProperties of recycled aggregate concrete (RAC) are influenced by the composition and particle size distribution of recycled coarse aggregate (RCA). The study herein designed seven distinct groups of RACs with varying aggregate fractal dimensions (<b><i>D</i></b>) and one group of natural concrete (NAC). The impact of <b><i>D</i></b> on the workability, compressive strength, resistance to chloride ion penetration, and carbonation resistance of RAC was measured. It was found that an increase in the D value led to a decrease in the slump and slump flow, with the compressive strength and chloride ion penetration increasing and then decreasing, and carbonation gradually declined. The optimal fractal dimension was thereby determined to be 2.547 by a strength model accommodating two parameters of <b><i>D</i></b> and the curing age. Additionally, the mass percentage of each particle size for the corresponding gradation was presented. The compressive strength and chloride permeation resistance of RAC (<b><i>D</i></b> = 1.0) relative to RAC (<b><i>D</i></b> = 2.5) was increased by 16.7% and 13.3%, respectively. Furthermore, the carbonation depth of RAC (<b><i>D</i></b> = 2.5) was comparable to that of NAC. Additionally, the carbonation resistance of RAC was influenced by both the size distribution and the degree of natural carbonation of RCA, resulting in four distinct features relative to NAC. It is thereby feasible to enhance RAC performance through the manipulation of RCA’s fractal dimensions.https://www.mdpi.com/2504-3110/7/9/663aggregate fractal gradationrecycled aggregatecompressive strengthchloride ion permeabilitycarbonation resistance |
| spellingShingle | Chang-Qing Quan Chu-Jie Jiao Wei-Zhi Chen Zhi-Cheng Xue Rui Liang Xue-Fei Chen The Impact of Fractal Gradation of Aggregate on the Mechanical and Durable Characteristics of Recycled Concrete Fractal and Fractional aggregate fractal gradation recycled aggregate compressive strength chloride ion permeability carbonation resistance |
| title | The Impact of Fractal Gradation of Aggregate on the Mechanical and Durable Characteristics of Recycled Concrete |
| title_full | The Impact of Fractal Gradation of Aggregate on the Mechanical and Durable Characteristics of Recycled Concrete |
| title_fullStr | The Impact of Fractal Gradation of Aggregate on the Mechanical and Durable Characteristics of Recycled Concrete |
| title_full_unstemmed | The Impact of Fractal Gradation of Aggregate on the Mechanical and Durable Characteristics of Recycled Concrete |
| title_short | The Impact of Fractal Gradation of Aggregate on the Mechanical and Durable Characteristics of Recycled Concrete |
| title_sort | impact of fractal gradation of aggregate on the mechanical and durable characteristics of recycled concrete |
| topic | aggregate fractal gradation recycled aggregate compressive strength chloride ion permeability carbonation resistance |
| url | https://www.mdpi.com/2504-3110/7/9/663 |
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