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

Öz

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.

Anahtar Kelimeler

• CBR test
• Textile waste
• Soil improvement
• Waste management

Farklı Katılım Oranları ve En Boy Oranları ile Çimento Kaplanmış Tekstil Atığı (CCTW) Kullanılarak Karayolu Alt Taban Zemini Mukavemetinin Artırılması

Öz

Zemin iyileştirme, özellikle zayıf zeminlerin taşıma kapasitesini artırmada, geoteknik mühendisliğinin kritik bir yönüdür. Geri dönüştürülmüş malzemeler kullanılarak yapılan sürdürülebilir güçlendirme yöntemleri, ekonomik ve çevresel faydaları nedeniyle ilgi görmektedir. Bu çalışma, çimento kaplı tekstil atıklarının (CCTW) Kaliforniya Taşıma Oranı (CBR) testi aracılığıyla kötü derecelenmiş kumun dayanımını artırmadaki etkinliğini araştırmaktadır. Çalışmanın temel amacı, CCTW’nin farklı en/boy oranlarında (AR1, AR2, AR4) ve katılım oranlarında (kuru ağırlıkça %2, %4 ve %6) zemin dayanımı üzerindeki etkisini değerlendirmektir. CCTW, tekstil atıklarının Portland çimento hamuru ile kaplanıp 28 gün kürlenmesi ve ardından belirlenen oranlarda zemin ile karıştırılmasıyla hazırlanmıştır. Sonuçlar, tüm güçlendirilmiş numunelerin CBR değerlerinde, güçlendirilmemiş zemine kıyasla önemli bir artış olduğunu göstermektedir. En iyi iyileşme, AR2 ve AR4 liflerinin en yüksek güçlendirme etkisini sağladığı %4 katılım oranında gözlemlenmiş olup, CBR değerleri sırasıyla %6,97 ve %6,87'ye ulaşmıştır. Ancak %4’ün üzerindeki aşırı katılım oranı, zemin performansında düşüşe yol açmıştır. İyileştirme faktörü analizi de güçlendirmenin etkinliğini doğrulamış olup, AR4-%4 ve AR2-%4 en yüksek kazançları sağlamıştır. Bu çalışma, CCTW’nin çevre dostu bir zemin stabilizatörü olarak potansiyelini vurgulayarak sürdürülebilir atık yönetimi ve maliyet etkin mühendislik çözümlerine katkı sağlamaktadır. Bulgular, maksimum zemin güçlendirme faydalarını sağlamak için optimal lif dozajının ve geometrik özelliklerin kritik öneme sahip olduğunu göstererek önemli çevresel, ekonomik ve mühendislik avantajları sunmaktadır.

Anahtar Kelimeler

• CBR testi
• Tekstil atığı
• Zemin iyileştirme
• Atık yönetimi

Kaynakça

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