Research on Mechanical Properties of GFRP Tube Confined Biochar Concrete Under Axial Compression

HE Zhengwei; CHEN Yuhan; GU Jinben; TAO Yi; DOU Yafen

doi:10.3724/j.gyjzG24032002

Volume 54 Issue 6

Jun. 2024

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HE Zhengwei, CHEN Yuhan, GU Jinben, TAO Yi, DOU Yafen. Research on Mechanical Properties of GFRP Tube Confined Biochar Concrete Under Axial Compression[J]. INDUSTRIAL CONSTRUCTION, 2024, 54(6): 149-159. doi: 10.3724/j.gyjzG24032002

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Research on Mechanical Properties of GFRP Tube Confined Biochar Concrete Under Axial Compression

doi: 10.3724/j.gyjzG24032002

HE Zhengwei¹,
CHEN Yuhan³,
GU Jinben^2,3,
TAO Yi^{3,4
,
,},
DOU Yafen³

1. CCCC-SHB Fourth Engineering Co., Ltd., Luoyang 471013, China;
2. Shanghai Key Laboratory of Engineering Structure Safety, SRIBS, Shanghai 200032, China;
3. College of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China;
4. State Key Laboratory of Green Building, Xi'an 710055, China

Received Date: 2023-03-20
Available Online: 2024-06-24

Abstract

Abstract

Biochar can be served as a lightweight aggregate material and its partial incorporation into concrete can realize internal curing and filling effects, thereby enhancing the mechanical properties of cementitious materials. It represents a potential carbon capture and sequestration technique. However, due to the high porosity of biochar’s microstructure, biochar concrete faces challenges such as low strength, poor corrosion resistance, and instability. This study proposed the use of Glass Fiber Reinforced Polymer (GFRP) tubes to confine biochar concrete, and the axial compression tests on GFRP tube-confined biochar concrete were performed, with design parameters including GFRP tube thickness (number of layers), biochar content, and biochar water absorption rate. Emphasis was placed on analyzing the axial stress-strain curves, circumferential strain-axial strain curves, yielding stress, ultimate strain, and circumferential fracture strain of each specimen. The results indicated that, under the premise of same biochar content and water absorption rate, the ultimate compressive strength of GFRP-confined biochar concrete specimens increased by 490.4% to 563.3% compared to that of unconfined specimens. The ultimate strain of confined specimens also significantly increased, and the yielding stress and strain of the confined specimens were much greater then those of unconfined specimens, indicating that GFRP confinement significantly improves the bearing capacity and deformation performance of biochar concrete. With increasing biochar content, the peak stress of confined specimens decreased while the axial ultimate strain increased. On the other hand, an increase in biochar water absorption rate led to an increase in the yielding load of confined specimens but a decrease in the ultimate strain. Additionally, an increase in the number of layers of GFRP tubes enhanced the secondary stiffness of confined specimens. The circumferential strain-axial strain curve exhibited no obvious transition point between the elastic segment and the linear segment, indicating that three was a good synergy between FRP tubes and biochar concrete.
- biochar concrete,
- fiber reinforced polymer,
- axial compressive performance,
- ultimate strain,
- yielding stress

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References

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