Concrete Mix Design for Completely Recycled Fine Aggregate by Modified Packing Density Method
The undesirable properties of conventional recycled fine aggregate (RFA) often limit its application in the construction industry. To overcome this challenge, a method for preparing completely recycled fine aggregate (CRFA), which crushes all concrete waste only into fine aggregate, was proposed. Th...
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| Format: | Article |
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MDPI AG
2020-08-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/13/16/3535 |
| _version_ | 1797559026371788800 |
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| author | Yibo Yang Baixi Chen Yan Su Qianpu Chen Zhiji Li Wenying Guo Hengchang Wang |
| author_facet | Yibo Yang Baixi Chen Yan Su Qianpu Chen Zhiji Li Wenying Guo Hengchang Wang |
| author_sort | Yibo Yang |
| collection | DOAJ |
| description | The undesirable properties of conventional recycled fine aggregate (RFA) often limit its application in the construction industry. To overcome this challenge, a method for preparing completely recycled fine aggregate (CRFA), which crushes all concrete waste only into fine aggregate, was proposed. The obtained CRFA had high apparent density, and its water absorption was lower than that of the conventional RFA. To take advantage of the CRFA, this paper introduced the modified packing density method for the CRFA concrete mix design. The modified packing density method took account of the powder with a particle size of smaller than 75 μm in the CRFA and balanced both the void ratio and the specific surface area of the aggregate system. Concrete (grade C55) was prepared using the CRFA to validate the feasibility of the proposed method. The unit price of the prepared CRFA concrete was around 12.7% lower than that of the natural aggregate concrete. Additionally, the proposed procedure for the concrete mixture design could recycle all concrete waste into the new concrete and replace all the natural fine aggregate in the concrete mixture. |
| first_indexed | 2024-03-10T17:39:52Z |
| format | Article |
| id | doaj.art-70b1466e2c9e41ba98106767f8c4939d |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T17:39:52Z |
| publishDate | 2020-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-70b1466e2c9e41ba98106767f8c4939d2023-11-20T09:44:38ZengMDPI AGMaterials1996-19442020-08-011316353510.3390/ma13163535Concrete Mix Design for Completely Recycled Fine Aggregate by Modified Packing Density MethodYibo Yang0Baixi Chen1Yan Su2Qianpu Chen3Zhiji Li4Wenying Guo5Hengchang Wang6School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, ChinaSchool of Civil Engineering, The University of Sydney, Sydney, NSW 2006, AustraliaSchool of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, ChinaSchool of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, ChinaSchool of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, ChinaSchool of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, ChinaSchool of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, ChinaThe undesirable properties of conventional recycled fine aggregate (RFA) often limit its application in the construction industry. To overcome this challenge, a method for preparing completely recycled fine aggregate (CRFA), which crushes all concrete waste only into fine aggregate, was proposed. The obtained CRFA had high apparent density, and its water absorption was lower than that of the conventional RFA. To take advantage of the CRFA, this paper introduced the modified packing density method for the CRFA concrete mix design. The modified packing density method took account of the powder with a particle size of smaller than 75 μm in the CRFA and balanced both the void ratio and the specific surface area of the aggregate system. Concrete (grade C55) was prepared using the CRFA to validate the feasibility of the proposed method. The unit price of the prepared CRFA concrete was around 12.7% lower than that of the natural aggregate concrete. Additionally, the proposed procedure for the concrete mixture design could recycle all concrete waste into the new concrete and replace all the natural fine aggregate in the concrete mixture.https://www.mdpi.com/1996-1944/13/16/3535concrete wastecompletely recycled fine aggregateconcrete mix designmodified packing density method |
| spellingShingle | Yibo Yang Baixi Chen Yan Su Qianpu Chen Zhiji Li Wenying Guo Hengchang Wang Concrete Mix Design for Completely Recycled Fine Aggregate by Modified Packing Density Method Materials concrete waste completely recycled fine aggregate concrete mix design modified packing density method |
| title | Concrete Mix Design for Completely Recycled Fine Aggregate by Modified Packing Density Method |
| title_full | Concrete Mix Design for Completely Recycled Fine Aggregate by Modified Packing Density Method |
| title_fullStr | Concrete Mix Design for Completely Recycled Fine Aggregate by Modified Packing Density Method |
| title_full_unstemmed | Concrete Mix Design for Completely Recycled Fine Aggregate by Modified Packing Density Method |
| title_short | Concrete Mix Design for Completely Recycled Fine Aggregate by Modified Packing Density Method |
| title_sort | concrete mix design for completely recycled fine aggregate by modified packing density method |
| topic | concrete waste completely recycled fine aggregate concrete mix design modified packing density method |
| url | https://www.mdpi.com/1996-1944/13/16/3535 |
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