|
Title |
Softening Behavior of Biochar-Based Concrete Subjected to Direct Tension
|
|
Authors |
한민규(Mingyu Han) ; 최원창(Wonchang Choi) ; 윤현도(Hyun-Do Yun) ; 서수연(Soo-Yeon Seo) ; 석승욱(Seungwook Seok) |
|
DOI |
https://doi.org/10.4334/JKCI.2026.38.5.593 |
|
Keywords |
바이오차 콘크리트; 연화 거동; 직접 인장 실험; 파괴에너지 biochar concrete; softening behavior; direct tensile test; fracture energy |
|
Abstract |
This study summarizes representative direct tensile test results for biochar-based concrete, focusing on tensile softening behavior. Plain concrete exhibited an average tensile strength of 2.78 MPa and a fracture energy of 0.077 N/mm. In comparison, concrete with 3% biochar replacement displayed a tensile strength of 2.18 MPa and a fracture energy of 0.026 N/mm, while the 5% replacement resulted in a tensile strength of 2.36 MPa and a fracture energy of 0.044 N/mm. Although tensile strength partially recovered at the 5% replacement level, both biochar concretes exhibited a pronounced reduction in fracture energy, indicating significantly increased post-cracking brittleness. These results highlight that the structural applicability of biochar-based concrete cannot be reliably assessed based solely on strength, and that tensile softening and fracture energy must be explicitly considered in the design and evaluation of low-carbon concrete materials.
|