Zeng, Qiang;
Jike, Nidu;
Xu, Chengji;
Yang, Rijiao;
Peng, Yu;
Wang, Jiyang;
Gong, Fuyuan;
... Zhao, Yuxi; + view all
(2022)
Total recycling of low-quality urban-fringe construction and demolition waste towards the development of sustainable cement-free pervious concrete: The proof of concept.
Journal of Cleaner Production
, 352
, Article 131464. 10.1016/j.jclepro.2022.131464.
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Abstract
This work presents a proof-of-concept study of recycling low-quality urban-fringe construction and demolition waste for the development of sustainable cement-free pervious concrete. Waste was in-situ collected from a local construction site of urban-fringe in Hangzhou, China, and elaborately analyzed for quality assessment. Ground brick powder was activated by alkali activators at different (Al+Si)/Na ratios to find the optimal mix ratio. Macro waste solids and alkali-activated recycled brick powder were used as the aggregate and binding material, respectively, to achieve total recycling of the waste. The effects of binder-to-aggregate ratio on the engineering performances and multi-scale structures of the cement-free recycled waste pervious concrete were explored. Results showed that the optimized alkali-activated recycled brick powder paste had high compressive strength up to 50 MPa. The cement-free recycled waste previous concrete showed relatively low compressive strength but high water permeability. Microstructural mechanisms in the aspects of pores, skeletons, and matrix-aggregate interactions were discussed. The replacement of cement by alkali-activated brick powder showed substantial economic and environmental benefits. The findings of this work would provide a promising route towards solving the large-scale construction and demolition waste in China.
| Type: | Article |
|---|---|
| Title: | Total recycling of low-quality urban-fringe construction and demolition waste towards the development of sustainable cement-free pervious concrete: The proof of concept |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.jclepro.2022.131464 |
| Publisher version: | https://doi.org/10.1016/j.jclepro.2022.131464 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions. |
| Keywords: | Recycling, Pervious concrete, Strength, CO2 emissions, Microstructure |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10145967 |
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