IJE TRANSACTIONS C: Aspects Vol. 32, No. 3 (March 2019) 373-380   

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M. Gharib, M. A. Arjomand, M. R. Abdi and A. Arefnia
( Received: December 14, 2018 – Accepted in Revised Form: March 07, 2019 )

Abstract    Use of soft clay soils in construction activities has faced many problems. Some improvement, stabilization, and reinforcement methods is required to use these soils in body of roads, sub-foundations and embankments. In this research, the effect of chitin nanofiber and rice husk ash as additives on the behavioral properties and bearing resistance of soft clay soils by considering the processing time of 7, 28, 42 and 90 days was investigated. The suitability of chitin nanofiber to be used as an additive was evaluated by FTIR, XRD and SEM analysis. Different percentages of additives (1, 2, 4, 6 and 8%) with variations in chitin nanofiber and rice husk ash ratio were added to soil containing 6% lime. Maximum reduction on liquid limit and plastic index was obtained by addition of 2% additives to the soil containing 6% lime in which the percentage of chitin nanofiber was more than rice husk ash. Using examined additives in clay soil resulted in to a significant increase in bearing resistance, specifically at higher percentages of additives and curing times (days). As a whole, obtained results confirmed the potential use of chitin nanofiber and rice husk ash as additives for the improvement of soft clay soils.


Keywords    Soft Clay Soils; Chitin Nanofiber; Rice Husk Ash; Bearing Resistance; Atterberg Limit



استفاده از خاک‌های رسی نرم در فعالیت‌های ساختمانی با مشکلات فراوانی مواجه شده است. برخی از روش‌های بهبود، تثبیت و تسلیحات برای استفاده از این خاک‌ها در جاده‌ها، زیر پایه‌ها و کف زمین مورد نیاز است. در اين تحقيق، تاثير نانوفیبر کيتين و خاكستر پوسته برنج به عنوان مواد افزودني روی خواص رفتاري و مقاومت فشاری خاك رس نرم با توجه به زمان پردازش 7، 28، 42 و 90 روز بررسي شده است. مناسب بودن نانوفیبر کیتین به عنوان یک افزودنی توسط آنالیزهای FTIR، XRD و SEM ارزیابی شده است. درصدهای مختلفی از افزودنی‌ها (1، 2، 4، 6 و 8 درصد) با تغییرات در نسبت نانو فیبر کیتین و نسبت خاکستر پوسته برنج به خاک حاوی 6 درصد آهک اضافه شده است. حداکثر کاهش در حد خمیری و شاخص پلاستیکی با افزودن 2٪ موادافزودنی به خاک حاوی آهک 6٪ که درصد نانوفیبر کیتین بیشتر از خاکستر پوسته برنج بود، بدست آمد. استفاده از مواد افزودنی مورد بررسی در خاک رس باعث افزایش قابل توجهی در مقاومت فشاری، به ویژه در درصدهای بالاتر از مواد افزودنی و زمان‌های پردازش شده است. به طور کلی، نتايج به دست آمده، استفاده بالقوه از نانوفیبر کيتين و خاکستر پوسته برنج را به عنوان مواد افزودني براي بهبود خاک‌هاي نرم رسوبي تأييد کرده است.


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