مقایسه اثرات دو نوع حلال قلیایی کاربید کلسیم پسماند و هیدروکسید سدیم بر تثبیت ژئوپلیمری خاک‌های رسی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده فنی و مهندسی، مجتمع آموزش عالی گناباد، گناباد، ایران

2 دانشکده مهندسی عمران، دانشگاه شهید باهنر کرمان، کرمان، ایران

3 دانشکده مهندسی عمران و نقشه برداری، دانشگاه تحصیلات تکمیلی ماهان، ماهان، ایران

چکیده

تولید سیمان به دلیل مصرف مقادیر زیاد سوخت‌های فسیلی و انتشار میزان بالای گازهای گلخآن‌های پیامدهای زیست‌محیطی فراوانی به دنبال دارد. این امر محققان را وادار به پژوهش و معرفی دسته جدیدی از چسباننده‌ها با کارایی بیشتر و آلایندگی بسیار کمتر نسبت به سیمان پرتلند تحت عنوان سیمآن‌های ژئوپلیمری یا سیمآن‌های سبز نموده است. در این پژوهش تاثیر استفاده از دو نوع حلال قلیایی متفاوت: هیدروکسید سدیم و کاربید کلسیم پسماند، برای تثبیت ژئوپلیمری خاک رسی CL مورد بررسی قرار گرفته است. ابتدا ترکیبات شیمیایی خاک، پودر شیشه، کاربید کلسیم پسماند و هیدروکسید سدیم توسط آزمایش XRF تعیین گردید. سپس رفتار مکانیکی نمونه‌های مختلف تثبیت شده ژئوپلیمری، نمونه‌های خاکی تثبیت نشده و نمونه‌های تثبیت شده با سیمان پرتلند معمولی توسط آزمایش مقاومت فشاری تک محوری مورد مطالعه قرار گرفته است. در این پژوهش تأثیر پارامترهایی همچون نوع و غلظت حلال قلیایی و زمان عمل‌آوری (7، 28 و 91 روز) بر مقاومت فشاری و کرنش گسیختگی نمونه‌ها مورد بررسی قرار گرفته است. جهت مطالعه تغییرات ریزساختاری نمونه‌ها از تصاویر SEM و آنالیز EDX بهره گرفته شده است. نتایج تحقیق حاکی از تثبیت مؤثر ژئوپلیمری خاک با استفاده از هر دو نوع حلال قلیایی بوده است. البته با توجه مزایای کاربید کلسیم پسماند شامل: هزینه تهیه بسیار کم، بازیافتی بودن و همچنین راندمان بالاتر در فرآیند تثبیت، استفاده از این حلال قلیایی از دیدگاه اقتصادی، زیست‌محیطی و فنی ارجحیت بیشتری دارد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Comparing the effects of two alkaline activators of sodium hydroxide and calcium carbide residue on geopolymeric stabilization of clay soils

نویسندگان [English]

  • Meysam Pourabbas Bilondi 1
  • Mohammad Mohsen Toufigh 2
  • Vahid Toufigh 3
1 Department of Civil Engineering, University of Gonabad
2 Department of Civil Engineering, Shahid Bahonar University of Kerman
3 Faculty of Civil and Surveying Engineering, Graduate University of Advanced Technology, Kerman, Iran
چکیده [English]

Nowadays, the Ordinary Portland Cement (OPC) industry causes extensive environmental consequences due to consuming huge amounts of fossil fuels. This necessitated researchers to introduce a novel group of binders called “Geopolymer cements” or “Green cements” with higher performance and lower pollution compared to the OPC. Thus, in this research, the effect of using two types of alkaline activators such as sodium hydroxide (NaOH) and calcium carbide residue (CCR), for the stabilization of clay soil (CL) has been investigated. Initially, the chemical compositions of soil, recycled glass powder, calcium carbide residue, and sodium hydroxide were obtained via X-ray fluorescence (XRF) test. Then, the mechanical behavior of different unstabilized, geopolymer-stabilized, and OPC-stabilized samples has studied using the unconfined compressive strength (UCS) test. The effects of several parameters such as the type and concentration of alkaline activators and the curing times (7, 28, and 91 days on the UCS and failure strain of samples have been assessed. Moreover, in order to study the microstructure of samples, scanning electron microscope (SEM) images and energy dispersive X-ray (EDX) analysis of selected samples have been used. Results showed the effective stabilization of soil geopolymer, using both alkaline activators. However, the CCR will be more appropriate if environmental and economic problems are considered.

کلیدواژه‌ها [English]

  • Alkaline activator
  • Calcium carbide residue
  • Sodium hydroxide
  • Recycled glass powder
  • Geopolymer

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نشریه مهندسی عمران امیرکبیر
دوره 54، شماره 10
دی 1401
صفحه 3923-3942

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