2025 - Sustainable Industrial Processing Summit
SIPS2025 Volume 5. Meyers Intl. Symp. / Composite

Editors:F. Kongoli, P. Assis, H.A.C. Lopera, S. Diaz, S.N. Monteiro, V.S. Candido
Publisher:Flogen Star OUTREACH
Publication Year:2025
Pages:316 pages
ISBN:978-1-998384-46-4 (CD)
ISSN:2291-1227 (Metals and Materials Processing in a Clean Environment Series)
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    EXPLORATORY STUDY ON THE EFFECT OF PIASSAVA FIBER ADDITION ON THE PERMANENT DEFORMATION OF CLAYEY SOIL

    Lisley Madeira Coelho1; Murilo Miguel Narciso1; José Carlos Guimarães Júnior2; Sergio Monteiro1; Antônio Carlos Rodrigues Guimarães1;
    1MILITARY INSTITUTE OF ENGINEERING, Rio de Janeiro, Brazil; 2GOVERNMENT OF THE FEDERAL DISTRICT, Rio de Janeiro, Brazil;
    Type of Paper: Regular
    Id Paper: 70
    Topic: 18

    Abstract:

    Evaluating the permanent deformation of soils used in pavements or final earthwork layers is essential for designing highways and railways when adopting a mechanistic approach to structural design. However, due to environmental concerns, exploiting new soil deposits for such projects has become increasingly challenging, making soil stabilization or reinforcement a viable alternative. In this context, this study sought to explore the effect of adding piassava fibers to a clayey soil commonly found in subgrade layers in Brazil. Repeated load triaxial tests were conducted to assess permanent deformation under two pairs of deviator and confining stresses: (210, 70) and (450, 100) kPa, with 100,000 loading cycles applied at a frequency of 5 Hz. Resilient modulus tests were performed following national standards, using samples of natural soil, natural soil with 1.5% piassava fiber, and natural soil with 1.5% piassava fiber and 2% cement. Results showed that natural soil exhibited high permanent deformation under the higher stress pair, while the simple addition of fibers significantly reduced deformation. With the addition of cement, total permanent deformation was minimal, indicating that piassava fiber is a promising material for reinforcing pavements or earthworks.

    Keywords:

    Permanent deformation; Piassava fiber reinforcement; Soil stabilization for pavements

    Cite this article as:

    Madeira Coelho L, Narciso M, Guimarães Júnior J, Monteiro S, Rodrigues Guimarães A. (2024). EXPLORATORY STUDY ON THE EFFECT OF PIASSAVA FIBER ADDITION ON THE PERMANENT DEFORMATION OF CLAYEY SOIL. In F. Kongoli, P. Assis, H.A.C. Lopera, S. Diaz, S.N. Monteiro, V.S. Candido (Eds.), Sustainable Industrial Processing Summit Volume 5 Meyers Intl. Symp. / Composite (pp. 139-140). Montreal, Canada: FLOGEN Star Outreach