Influences of Efficient Spraying of Cement-Based Slurries on Recycled Coarse Aggregate
The inferior property is usually one of the major problems of recycled coarse aggregate (RCA), and the utilization of the RCA is limited. Strengthening the RCA is being widely explored. Immersing the RCA in the cement-based slurry is an effective approach. However, lots of slurry and time are requir...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-11-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/21/7730 |
| _version_ | 1797467483982004224 |
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| author | Jinming Yin Aihong Kang Peng Xiao Zhengguang Wu Changjiang Kou Yongfan Gong Chenghui Xiao |
| author_facet | Jinming Yin Aihong Kang Peng Xiao Zhengguang Wu Changjiang Kou Yongfan Gong Chenghui Xiao |
| author_sort | Jinming Yin |
| collection | DOAJ |
| description | The inferior property is usually one of the major problems of recycled coarse aggregate (RCA), and the utilization of the RCA is limited. Strengthening the RCA is being widely explored. Immersing the RCA in the cement-based slurry is an effective approach. However, lots of slurry and time are required, and it is difficult to integrate the immersing method into the production line of the RCA. In this paper, a circular spraying method was proposed to treat the RCA using cement-based slurry. The immersing method was also conducted to verify the feasibility of the spraying method. The crushing value (CV), 24 h water absorption (WA), apparent density (AD) and dynamic water absorption (DWA) were tested, and the micro-morphology was also observed to explore the strengthening mechanism. Results showed that the CV and the WA decreased by up to 30.0% and 14.3% when the spraying method was used. The AD was slightly influenced by the cement-based slurry regardless of the treatment method. Considering the CV, WA and AD, the comprehensive grade of the RCA could be enhanced from III to II by using the spraying method. It was worth noting that the effects of the spraying method and the immersing method were basically equivalent. When the spraying method was adopted, only about 1 min and a small amount of slurry (about 5% of the RCA mass) were required to treat the RCA. |
| first_indexed | 2024-03-09T18:53:22Z |
| format | Article |
| id | doaj.art-ee06cc9072f64050b1e5d2f50044546d |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T18:53:22Z |
| publishDate | 2022-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-ee06cc9072f64050b1e5d2f50044546d2023-11-24T05:39:55ZengMDPI AGMaterials1996-19442022-11-011521773010.3390/ma15217730Influences of Efficient Spraying of Cement-Based Slurries on Recycled Coarse AggregateJinming Yin0Aihong Kang1Peng Xiao2Zhengguang Wu3Changjiang Kou4Yongfan Gong5Chenghui Xiao6College of Civil Science and Engineering, Yangzhou University, Yangzhou 225100, ChinaCollege of Civil Science and Engineering, Yangzhou University, Yangzhou 225100, ChinaCollege of Civil Science and Engineering, Yangzhou University, Yangzhou 225100, ChinaCollege of Civil Science and Engineering, Yangzhou University, Yangzhou 225100, ChinaCollege of Civil Science and Engineering, Yangzhou University, Yangzhou 225100, ChinaCollege of Civil Science and Engineering, Yangzhou University, Yangzhou 225100, ChinaYangzhou Huimin Renewable Resources Co., Ltd., Yangzhou 225100, ChinaThe inferior property is usually one of the major problems of recycled coarse aggregate (RCA), and the utilization of the RCA is limited. Strengthening the RCA is being widely explored. Immersing the RCA in the cement-based slurry is an effective approach. However, lots of slurry and time are required, and it is difficult to integrate the immersing method into the production line of the RCA. In this paper, a circular spraying method was proposed to treat the RCA using cement-based slurry. The immersing method was also conducted to verify the feasibility of the spraying method. The crushing value (CV), 24 h water absorption (WA), apparent density (AD) and dynamic water absorption (DWA) were tested, and the micro-morphology was also observed to explore the strengthening mechanism. Results showed that the CV and the WA decreased by up to 30.0% and 14.3% when the spraying method was used. The AD was slightly influenced by the cement-based slurry regardless of the treatment method. Considering the CV, WA and AD, the comprehensive grade of the RCA could be enhanced from III to II by using the spraying method. It was worth noting that the effects of the spraying method and the immersing method were basically equivalent. When the spraying method was adopted, only about 1 min and a small amount of slurry (about 5% of the RCA mass) were required to treat the RCA.https://www.mdpi.com/1996-1944/15/21/7730recycled coarse aggregateenhancementspraying methodimmersing methodcrushing valuewater absorption |
| spellingShingle | Jinming Yin Aihong Kang Peng Xiao Zhengguang Wu Changjiang Kou Yongfan Gong Chenghui Xiao Influences of Efficient Spraying of Cement-Based Slurries on Recycled Coarse Aggregate Materials recycled coarse aggregate enhancement spraying method immersing method crushing value water absorption |
| title | Influences of Efficient Spraying of Cement-Based Slurries on Recycled Coarse Aggregate |
| title_full | Influences of Efficient Spraying of Cement-Based Slurries on Recycled Coarse Aggregate |
| title_fullStr | Influences of Efficient Spraying of Cement-Based Slurries on Recycled Coarse Aggregate |
| title_full_unstemmed | Influences of Efficient Spraying of Cement-Based Slurries on Recycled Coarse Aggregate |
| title_short | Influences of Efficient Spraying of Cement-Based Slurries on Recycled Coarse Aggregate |
| title_sort | influences of efficient spraying of cement based slurries on recycled coarse aggregate |
| topic | recycled coarse aggregate enhancement spraying method immersing method crushing value water absorption |
| url | https://www.mdpi.com/1996-1944/15/21/7730 |
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