Evaluation of Compressive Strength of Uncalcined Dredged Sediment and Fly Ash-based Geopolymer Using Response Surface Method

سال انتشار: 1404
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 125

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شناسه ملی سند علمی:

JR_IJE-38-3_015

تاریخ نمایه سازی: 27 آبان 1403

چکیده مقاله:

Dredged sediments from dredging operations pose environmental hazards and disposal challenges. The geopolymerization method for treating these sediments offers an eco-friendly alternative to Portland cement. This study develops geopolymer materials using uncalcined dredged sediment, fly ash, and an alkali activator (sodium hydroxide and sodium silicate). The compressive strength of the geopolymer was tested after ۷ days curing under two conditions (ambient and at ۶۰°C for the first ۲۴ hours) and analyzed using Box-Behnken Design and Response Surface Method. The study examined three variables: sodium hydroxide molarity (۶M to ۱۲M), sediment-to-total solids ratio (۰.۳ to ۰.۹), and sodium silicate solution-to-sodium hydroxide solution ratio (۱ to ۳). High-accuracy prediction models were established, and the desirability function was used to optimize the mixture proportions for the two curing conditions. The multi-objective optimization aimed to meet the strength requirement of TCVN ۶۴۷۷:۲۰۱۶ standards for concrete bricks, maximize dredged sediment content, and minimize sodium silicate usage. The optimal mixture achieved a compressive strength of ۷.۵ MPa at ۷ days, with ۳۷.۵۳% dredged sediment for ambient curing and ۴۵.۵۹% for drying curing. Compared to ambient curing, drying curing enables a higher sediment content and a reduced use of NaOH. Furthermore, the geopolymer reactions and gel matrix formation of the optimal mixture were confirmed by FTIR spectra and SEM observations.

نویسندگان

T. D. Thai

Department of Silicate Materials, Faculty of Materials Technology, Ho Chi Minh City University of Technology (HCMUT), ۲۶۸ Ly Thuong Kiet Street, District ۱۰, Ho Chi Minh City, Vietnam

N. M. Huynh

Department of Silicate Materials, Faculty of Materials Technology, Ho Chi Minh City University of Technology (HCMUT), ۲۶۸ Ly Thuong Kiet Street, District ۱۰, Ho Chi Minh City, Vietnam

D. T. K. Kieu

Department of Silicate Materials, Faculty of Materials Technology, Ho Chi Minh City University of Technology (HCMUT), ۲۶۸ Ly Thuong Kiet Street, District ۱۰, Ho Chi Minh City, Vietnam

V. U. N. Nguyen

Department of Silicate Materials, Faculty of Materials Technology, Ho Chi Minh City University of Technology (HCMUT), ۲۶۸ Ly Thuong Kiet Street, District ۱۰, Ho Chi Minh City, Vietnam

Q. M. Do

Department of Silicate Materials, Faculty of Materials Technology, Ho Chi Minh City University of Technology (HCMUT), ۲۶۸ Ly Thuong Kiet Street, District ۱۰, Ho Chi Minh City, Vietnam

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