Chemical treatments such as alkaline, saline-treatment has been experimentally proven to improve the mechanical properties of natural fibers. However, drawbacks to the treatment includes shrinkage of diameter and length. This affects the aspect-ratio of the fiber. Though the interfacial bond increases and there's a higher possibility of greater adhesion between the fiber surface and concrete matrix, the high aspect ratio will, I assume, decrease the mechanical properties of concrete? I have yet to read articles using chemically treated natural fibers in concrete mix so if anyone has any recommendation, please do drop a quick comment.

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