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한국콘크리트학회|IJCSM 2020년 11월

논문명 Studies on Hemp and Recycled Aggregate Concrete
저자명 (Samer Ghosn) ; (Nour Cherkawi) ; (Bilal Hamad)
발행사 한국콘크리트학회
수록사항 IJCSM, Vol.14 No.6 (2020-11)
페이지 시작페이지(921) 총페이지(17)
ISSN 1976-0485
주제분류 재료 / 구조
주제어 ; sustainable concrete materials; recycled aggregates; hemp fibers; mitigation of wastes; characterization; mechanical properties; durability
요약2 This paper reports on the first phase of a multi-phase research program conducted at the American University of Beirut (AUB) on “Hemp and Recycled Aggregates Concrete” (HRAC). HRAC is a new sustainable concrete material where hemp fibers are incorporated in the mix, the coarse aggregate content is reduced by 20% of the concrete volume, and 50% of the natural coarse aggregates (NCA) are replaced by recycled concrete aggregates (RCA), thus saving on natural resources and addressing the problem of waste material disposal. The effect of the new material on concrete consistency and hardened mechanical properties was studied. Also, few durability tests were conducted. Variables included percentage replacement of NCA by RCA (0 or 50%), maximum size aggregate (10 or 20 mm), hemp fiber length (20 or 30 mm), and hemp fiber treatment (alkali or silane or acetyl). Fiber characterization tests were conducted including morphology, crystallinity, and thermal analysis. The tests indicated that alkali and acetyl fiber treatments were better than the silane treatment in removing impurities on the fiber surface. Also, alkali and acetyl treatments have increased the crystallinity of the fibers while silane treatment decreased it. Results of mechanical properties tests showed that while HRAC has considerable lower compressive strength and modulus of elasticity than plain concrete, the flexural strength and splitting tensile strength are not significantly affected. The flexural stress-strain behavior of HRAC is ductile as compared to the brittle behavior of the plain concrete beams indicating positive impact on toughness and energy dissipation. The durability tests indicated that whereas HRAC mixes have higher absorption than plain concrete, they have better thermal properties and their resistance to freeze-thaw cycles is com-parable to plain concrete. All test results were not significantly affected by fiber length or fiber treatment.
소장처 한국콘크리트학회
언어 영어
DOI https://doi.org/10.1186/s40069-020-00429-6