Enhancement of Highway Subgrade Soil Strength Using Cement-Coated Textile Waste (CCTW) with Varying Inclusion Rates and Aspect Ratios

Authors : Yakup Önal, Mitat Öztürk
Pages : 2263-2276
Doi:10.47495/okufbed.1635905
View : 47 | Download : 125
Publication Date : 2025-12-15
Article Type : Research Paper
Abstract :Soil improvement is a critical aspect of geotechnical engineering, particularly in enhancing the load-bearing capacity of weak soils. Sustainable reinforcement methods using recycled materials have gained attention due to their economic and environmental benefits. This study investigates the effectiveness of cement-coated textile waste (CCTW) in improving the strength of poorly graded sand via California Bearing Ratio (CBR) testing. The main objective of this study is to evaluate the impact of incorporating CCTW at varying aspect ratios (AR1, AR2, AR4) and inclusion rates (2%, 4%, and 6% by dry weight) on soil strength. CCTW was prepared by coating textile waste with Portland cement paste, curing for 28 days, and then mixing with the soil at designated ratios. The results indicate a significant enhancement in the CBR values of all reinforced specimens compared to unreinforced soil. The optimal improvement was observed at a 4% inclusion rate, where AR2 and AR4 fibers provided the highest reinforcement effect, with CBR values reaching up to 6,97% and 6,87%, respectively. However, beyond 4%, excessive inclusion rate led to a decline in soil performance. The improvement factor analysis further confirmed the efficiency of reinforcement, with AR4-4% and AR2-4% yielding the highest gains. This study highlights the potential of CCTW as an eco-friendly soil stabilizer, promoting sustainable waste management and cost-effective engineering solutions. The findings suggest that optimal fiber dosage and geometric properties are crucial in maximizing soil reinforcement benefits, offering significant environmental, economic, and engineering advantages.
Keywords : CBR testi, Tekstil atığı, Zemin iyileştirme, Atık yönetimi

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