Corn waste-derived biochar as a sustainable fine aggregate in pervious concrete for climate-resilient urban pavement applications
This study introduces a novel pervious concrete incorporating corn waste-derived biochar as a partial replacement for natural fine aggregate. Unlike prior work that substitutes biochar for cement, this design uses biochar as a sustainable bio-fine aggregate, replacing 7.5–12 % of fine sand. The opti...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-10-01
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| Series: | Developments in the Built Environment |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666165925001358 |
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| Summary: | This study introduces a novel pervious concrete incorporating corn waste-derived biochar as a partial replacement for natural fine aggregate. Unlike prior work that substitutes biochar for cement, this design uses biochar as a sustainable bio-fine aggregate, replacing 7.5–12 % of fine sand. The optimized mix (BPC3) achieved a 28-day compressive strength of 14.7 MPa, a total porosity of 27.3 %, and a water permeability of 4.21 mm/s. These values meet the functional requirements for permeable pavements. A cradle-to-gate life cycle assessment revealed a 21.6 % reduction in greenhouse gas emissions compared to conventional pervious concrete. This environmental benefit arises from carbon sequestration in biochar and avoided CO2 emissions from the open-field burning of corn residues. These results demonstrate that corn-biochar pervious concrete can deliver the necessary mechanical and hydraulic performance while substantially reducing embodied carbon, offering a low-carbon solution for sustainable pavement construction. |
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| ISSN: | 2666-1659 |