Abstract
Each year a large amount of construction and demolition waste (CDW) is generated in the European Union. For sustainability development the CDW is recycled and re-used. To promote the use of CDW, recycled aggregates from CDW were incorporated in alkali-activated concrete (AAC), which mainly consisted of secondary materials or industrial by-products. This study investigated the influence of recycled aggregates on workability, compressive strength and drying shrinkage of slag-based AAC. Properties of conventional concrete with natural/recycled aggregates were also tested for comparison. The results showed that the pre-saturated recycled aggregates only slightly affected the workability of conventional concrete or AAC. Recycled aggregates reduced compressive strength of both conventional concrete and AAC due to extra water for pre-saturation of the recycled aggregates. The mass loss of the concrete specimens upon drying was greater for low-strength concrete than for moderate strength concrete. The recycled aggregates increased the mass loss and drying shrinkage of AAC. For conventional concrete, low-strength concrete had a higher drying shrinkage compared with moderate strength concrete. On the contrary, for AAC in this study, low-strength concrete had a lower drying shrinkage compared with moderate strength concrete.
Original language | English |
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Title of host publication | 4th International Rilem Conference on Microstructure Related Durability of Cementitious Composites |
Subtitle of host publication | Microdurability 2020 |
Editors | Guang Ye, Hua Dong, Jiaping Liu, Erik Schlangen, Changwen Miao |
Publisher | Delft University of Technology |
Pages | 757-764 |
Number of pages | 8 |
ISBN (Electronic) | 978-94-6366-422-6 |
Publication status | Published - 2021 |
Event | 4th International Rilem Conference on Microstructure Related Durability of Cementitious Composites - Online, Delft, Netherlands Duration: 29 Apr 2021 → 27 May 2021 Conference number: 4 https://www.microdurability2020.com/99721 |
Conference
Conference | 4th International Rilem Conference on Microstructure Related Durability of Cementitious Composites |
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Abbreviated title | Microdurability |
Country/Territory | Netherlands |
City | Delft |
Period | 29/04/21 → 27/05/21 |
Internet address |
Keywords
- recycled aggregates
- conventional concrete
- alkali-activated concrete
- compressive strength
- drying shrinkage