Macroscopic and microstructural properties of engineered cementitious composites incorporating recycled concrete fines
Recycled concrete fines (RCF) are fine aggregates and particles from the demolition waste of old concrete. Unlike recycled coarse aggregates, RCF is seldom used to replace sands in concrete due to its high surface area and attached old mortar on the surface of RCF. This study investigated potential...
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| Format: | Journal Article |
| Jezik: | English |
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2017
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| Online pristup: | https://hdl.handle.net/10356/83180 http://hdl.handle.net/10220/42497 |
| _version_ | 1826128296317812736 |
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| author | Li, Junxia Yang, En-Hua |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Li, Junxia Yang, En-Hua |
| author_sort | Li, Junxia |
| collection | NTU |
| description | Recycled concrete fines (RCF) are fine aggregates and particles from the demolition waste of old concrete. Unlike recycled coarse aggregates, RCF is seldom used to replace sands in concrete due to its high surface area and attached old mortar on the surface of RCF. This study investigated potential use of RCF as microsilica sand substitute in the production of engineered cementitious composites (ECC), a unique high performance fiber-reinforced cementitious composites featuring extreme tensile strain capacity of several percent. The results showed that it is viable to use RCF as microsilica sand substitute in the production of ECC and the resulting RCF-ECCs possess decent compressive strength and strain capacity. Microstructure investigation on the component level revealed that RCF size and content modify matrix toughness and fiber/matrix interface properties. The influence of RCF size and content on ECC properties was clearly revealed and explained by the resulting fiber bridging σ(δ) curves of RCF-ECCs calculated from the micromechanical model. Micromechanics-based design principle can therefore be used for ingredients selection and component tailoring of RCF-ECCs. |
| first_indexed | 2024-10-01T07:22:39Z |
| format | Journal Article |
| id | ntu-10356/83180 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:22:39Z |
| publishDate | 2017 |
| record_format | dspace |
| spelling | ntu-10356/831802020-09-26T22:02:09Z Macroscopic and microstructural properties of engineered cementitious composites incorporating recycled concrete fines Li, Junxia Yang, En-Hua School of Civil and Environmental Engineering Interdisciplinary Graduate School (IGS) Nanyang Environment and Water Research Institute Residues and Resource Reclamation Centre Recycled concrete fines Engineered cementitious composites Recycled concrete fines (RCF) are fine aggregates and particles from the demolition waste of old concrete. Unlike recycled coarse aggregates, RCF is seldom used to replace sands in concrete due to its high surface area and attached old mortar on the surface of RCF. This study investigated potential use of RCF as microsilica sand substitute in the production of engineered cementitious composites (ECC), a unique high performance fiber-reinforced cementitious composites featuring extreme tensile strain capacity of several percent. The results showed that it is viable to use RCF as microsilica sand substitute in the production of ECC and the resulting RCF-ECCs possess decent compressive strength and strain capacity. Microstructure investigation on the component level revealed that RCF size and content modify matrix toughness and fiber/matrix interface properties. The influence of RCF size and content on ECC properties was clearly revealed and explained by the resulting fiber bridging σ(δ) curves of RCF-ECCs calculated from the micromechanical model. Micromechanics-based design principle can therefore be used for ingredients selection and component tailoring of RCF-ECCs. NRF (Natl Research Foundation, S’pore) Accepted version 2017-05-26T06:53:54Z 2019-12-06T15:13:28Z 2017-05-26T06:53:54Z 2019-12-06T15:13:28Z 2017 Journal Article Li, J., & Yang, E. -H. (2017). Macroscopic and microstructural properties of engineered cementitious composites incorporating recycled concrete fines. Cement and Concrete Composites, 78, 33-42. 0958-9465 https://hdl.handle.net/10356/83180 http://hdl.handle.net/10220/42497 10.1016/j.cemconcomp.2016.12.013 en Cement and Concrete Composites © 2017 Elsevier. This is the author created version of a work that has been peer reviewed and accepted for publication by Cement and Concrete Composites, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1016/j.cemconcomp.2016.12.013]. 64 p. application/pdf |
| spellingShingle | Recycled concrete fines Engineered cementitious composites Li, Junxia Yang, En-Hua Macroscopic and microstructural properties of engineered cementitious composites incorporating recycled concrete fines |
| title | Macroscopic and microstructural properties of engineered cementitious composites incorporating recycled concrete fines |
| title_full | Macroscopic and microstructural properties of engineered cementitious composites incorporating recycled concrete fines |
| title_fullStr | Macroscopic and microstructural properties of engineered cementitious composites incorporating recycled concrete fines |
| title_full_unstemmed | Macroscopic and microstructural properties of engineered cementitious composites incorporating recycled concrete fines |
| title_short | Macroscopic and microstructural properties of engineered cementitious composites incorporating recycled concrete fines |
| title_sort | macroscopic and microstructural properties of engineered cementitious composites incorporating recycled concrete fines |
| topic | Recycled concrete fines Engineered cementitious composites |
| url | https://hdl.handle.net/10356/83180 http://hdl.handle.net/10220/42497 |
| work_keys_str_mv | AT lijunxia macroscopicandmicrostructuralpropertiesofengineeredcementitiouscompositesincorporatingrecycledconcretefines AT yangenhua macroscopicandmicrostructuralpropertiesofengineeredcementitiouscompositesincorporatingrecycledconcretefines |