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This short communication presents some comments on the  Journal of Natural Fibers  paper titled “Strength and Deformation Behavior of Fine-Grained Soils Reinforced with Hair Fibers and Its Application in Pavement Design.” The paper demonstrated the significant improvements in undrained shear strength and stiffness, and CBR value achieved for addition (at 2 wt%) of waste human-hair-fiber (HHF) to Dhanauri Clay and Delhi Silt materials investigated. Considering the proposed application in soil improvement, the paper also examined rigid and flexible pavement design for HHF-reinforced soil subgrade. Various aspects of the original investigation are commented on in this communication, including ( i ) the apparent poorer compaction behavior (and hence the likely higher compressibility) of the HHF-reinforced soil materials compared to their unreinforced counterparts and ( ii ) a technical error in the reported consistency/Atterberg limits experimental investigation. Consistency limits testing is synonymous with the soil fraction passing the 425- μ m sieve size, such that it is not proper to perform consistency limits testing for HHF-reinforced fine-grained soil samples. The commentary concludes with some recommendations for future studies on soil−HHF mixtures directed at investigating their long-term geotechnical performance as soil subgrade.

journal of natural fibers

Comments on ‘Strength and Deformation Behavior of Fine-Grained Soils Reinforced with Hair Fibers and Its Application in Pavement Design’ by Ayothiraman  et al . [Journal of Natural Fibers, DOI: 10.1080/15440478.2021.1954129]