02575naa a2200241 a 450000100080000000500110000800800410001902200140006002400590007410000210013324501740015426000090032830000100033752017630034765300220211065300260213265300220215865300190218070000240219970000190222370000300224277300610227221880272026-07-06       2026    bl uuuu     u00u1 u    #d  a0950-06187 ahttps://doi.org/10.1016/j.conbuildmat.2025.1450752DOI1 aSOARES, E. N. C.  aInterfacial behavior and mechanical and microstructural properties of cement-based composites reinforced with banana, eucalyptus and sisal fibers.h[electronic resource]  c2026  a15 p.  aThis study evaluates the influence of alkaline treatment on the properties of banana, eucalyptus and sisal fibers and their interaction with a cement-based matrix. The fibers were treated with a 5 % NaOH solution under heating and stirring for 2 h. The composite mixture was produced using agricultural limestone, additives, water and 3 % fibers (by cement mass). Scanning electron microscopy (SEM) was used to assess morphological changes in the fibers and composites, while X-ray diffraction was employed to identify crystalline phases and changes to hydration products due to the introduction of fibres., and thermogravimetric analysis was used to evaluate mass- loss behavior and thermal stability of the fiber-reinforced composites. Alkaline treatment of banana fibers reduced extractives; however, the remaining lignin (20.8 %) and extractives (6.8 %) maintained a relatively unreactive surface, resulting in only modest gains. For sisal fibers, a 30 % reduction in lignin increased structural purity, enhancing fiber–matrix adhesion and raising the modulus of elasticity (MOE) by 46.3 % compared to the untreated condition. In composites with treated eucalyptus fibers, increased water absorption and fiber swelling reduced the modulus of rupture by 9 %, although they yielded the highest MOE (7.14 GPa) and a 95 % increase in toughness among all the evaluated fibers. The SEM analyses confirmed significant morphological alterations after treatment, showing a transition from larger, spherical pores to smaller, irregular pores. According to the results of the study, the use of fibers contributes significantly to the improvement of the mechanical performance of the composites, demonstrating their potential for application in civil construction.  aCement composites  aLignocellulosic fiber  aSurface treatment  aSustainability1 aGARCIA, D. C. da S.1 aMARTINS, M. A.1 aGUIMARÃES JÚNIOR, J. B.  tConstruction & Building Materialsgv. 507, 145075, 2026.