Autogenous and drying shrinkage properties of precast recycled aggregate concrete
Crushing prefabricated rejects into recycled aggregates (PRAs) and recasting them forms precast recycled aggregate concrete (PRAC), which offers superior mechanical properties, durability, and cost and environmental benefits compared to conventional RAC. However, limited research on its shrinkage ch...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-07-01
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| Series: | Case Studies in Construction Materials |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509525001536 |
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| author | Ningxu Zhang Qing Yang Dapeng Li Yong Yu Xiaoyu Jiang Jinjun Xu |
| author_facet | Ningxu Zhang Qing Yang Dapeng Li Yong Yu Xiaoyu Jiang Jinjun Xu |
| author_sort | Ningxu Zhang |
| collection | DOAJ |
| description | Crushing prefabricated rejects into recycled aggregates (PRAs) and recasting them forms precast recycled aggregate concrete (PRAC), which offers superior mechanical properties, durability, and cost and environmental benefits compared to conventional RAC. However, limited research on its shrinkage characteristics hinders its practical use in engineering. This paper thus provides a comprehensive analysis of the autogenous and drying shrinkage properties of PRAC through experimental and theoretical methods. It first explores the effects of factors like water-to-cement ratio, PRA replacement rates, PRA’s parent concrete strength and mixing techniques on ultimate shrinkage strains and dimensionless strain-age curves. Predictive models for autogenous and drying shrinkage of PRAC are then developed based on the results. Key findings include: (i) The addition of PRAs alters shrinkage behavior, typically reducing autogenous shrinkage strain ultimate values and increasing drying shrinkage strain ultimate values, with finer PRAs having a greater impact than coarser ones. (ii) Raising the strength grade of the PRA's parent concrete minimally affects autogenous shrinkage but significantly reduces drying shrinkage. (iii) The two-stage mixing method has minimal effect on shrinkage strain, while the equivalent volume mortar method significantly reduces both autogenous and drying shrinkage. (iv) The predictive models for autogenous and drying shrinkage demonstrate high accuracy and safety. |
| format | Article |
| id | doaj-art-2a5624d0f5d04b9a9d76603619d3fd3d |
| institution | Kabale University |
| issn | 2214-5095 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj-art-2a5624d0f5d04b9a9d76603619d3fd3d2025-02-05T04:32:06ZengElsevierCase Studies in Construction Materials2214-50952025-07-0122e04355Autogenous and drying shrinkage properties of precast recycled aggregate concreteNingxu Zhang0Qing Yang1Dapeng Li2Yong Yu3Xiaoyu Jiang4Jinjun Xu5College of Civil Engineering, Nanjing Tech University, Nanjing 211816, ChinaChina Construction Seventh Engineering Division (Shanghai) CO. LTD., Shanghai 201812, ChinaChina Construction Seventh Engineering Division CORP. LTD., Zhengzhou 450004, ChinaSchool of Intelligent Transportation and Engineering, Guangzhou Maritime University, Guangzhou 510725, China; Corresponding authors.College of Civil Engineering, Nanjing Tech University, Nanjing 211816, ChinaCollege of Civil Engineering, Nanjing Tech University, Nanjing 211816, China; Corresponding authors.Crushing prefabricated rejects into recycled aggregates (PRAs) and recasting them forms precast recycled aggregate concrete (PRAC), which offers superior mechanical properties, durability, and cost and environmental benefits compared to conventional RAC. However, limited research on its shrinkage characteristics hinders its practical use in engineering. This paper thus provides a comprehensive analysis of the autogenous and drying shrinkage properties of PRAC through experimental and theoretical methods. It first explores the effects of factors like water-to-cement ratio, PRA replacement rates, PRA’s parent concrete strength and mixing techniques on ultimate shrinkage strains and dimensionless strain-age curves. Predictive models for autogenous and drying shrinkage of PRAC are then developed based on the results. Key findings include: (i) The addition of PRAs alters shrinkage behavior, typically reducing autogenous shrinkage strain ultimate values and increasing drying shrinkage strain ultimate values, with finer PRAs having a greater impact than coarser ones. (ii) Raising the strength grade of the PRA's parent concrete minimally affects autogenous shrinkage but significantly reduces drying shrinkage. (iii) The two-stage mixing method has minimal effect on shrinkage strain, while the equivalent volume mortar method significantly reduces both autogenous and drying shrinkage. (iv) The predictive models for autogenous and drying shrinkage demonstrate high accuracy and safety.http://www.sciencedirect.com/science/article/pii/S2214509525001536Precast recycled aggregate concreteAutogenous and drying shrinkageRecycled aggregate qualityConcrete mixing methodShrinkage prediction model |
| spellingShingle | Ningxu Zhang Qing Yang Dapeng Li Yong Yu Xiaoyu Jiang Jinjun Xu Autogenous and drying shrinkage properties of precast recycled aggregate concrete Case Studies in Construction Materials Precast recycled aggregate concrete Autogenous and drying shrinkage Recycled aggregate quality Concrete mixing method Shrinkage prediction model |
| title | Autogenous and drying shrinkage properties of precast recycled aggregate concrete |
| title_full | Autogenous and drying shrinkage properties of precast recycled aggregate concrete |
| title_fullStr | Autogenous and drying shrinkage properties of precast recycled aggregate concrete |
| title_full_unstemmed | Autogenous and drying shrinkage properties of precast recycled aggregate concrete |
| title_short | Autogenous and drying shrinkage properties of precast recycled aggregate concrete |
| title_sort | autogenous and drying shrinkage properties of precast recycled aggregate concrete |
| topic | Precast recycled aggregate concrete Autogenous and drying shrinkage Recycled aggregate quality Concrete mixing method Shrinkage prediction model |
| url | http://www.sciencedirect.com/science/article/pii/S2214509525001536 |
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