مقایسه عملکرد ترکیب ضایعات صنعتی و الیاف نسبت به سیمان در شدت‌‌بخشی فرآیند تثبیت خاک برای مقابله با شرایط محیطی مهاجم

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، دانشکده فنی و مهندسی، واحد اراک، دانشگاه آزاداسلامی، اراک، ایران

2 گروه مهندسی عمران، دانشکده فنی و مهندسی، واحد همدان، دانشگاه آزاد اسلامی، همدان، ایران

چکیده

در مطالعه حاضر کارآیی ترکیبی جدید از ضایعات صنعتی شامل پسماند کاربید کلسیم (CCR) و سیلیکافوم (SF) در کنار الیاف پلی‌‌پروپیلن در مقایسه با سیمان برای اصلاح رس‌‌های نرم و افزایش دوام آنها بررسی شد. نتایج آزمایشگاهی نشان داد در شرایط متداول عمل‌‌آوری (دما ºC20 و نگهداری تا 28 روز) استفاده از CCR تنها، اثر محدودی در بهبود رفتار خاک دارد. از طرفی، با وجود عملکرد مطلوب اولیه فرآیند تثبیت با سیمان، ولی چرخه تر و خشک (W-D) با شکست نانوساختارهای سیمانی، می‌‌تواند سبب اختلال و حتی از دست رفتن کامل ظرفیت باربری خاک شود. در مقابل، ترکیب CCR با SF نقش برجسته‌‌ای‌‌ بر فرآیند بهسازی (خصوصاً با افزایش دما) داشته و پتانسیل زوال به مراتب کمتری در حضور نسبت بهینه CCR-SF مشاهده گردید. بنابر آنالیزهای SEM-EDX و XRD، گسترش جامدشدگی ساختار و کاهش سهم حفرات، جزء عوامل اصلی پاسخ مناسب‌‌تر سیستم اخیر ارزیابی شد. از سوی دیگر، افزودن فیبر به این سری از نمونه‌‌ها، تاثیر بسزایی در رشد تاب کششی، جذب بهتر انرژی، کاهش قابلیت ترک‌‌خوردگی و در نتیجه بهبود پایایی ماتریکس خاک دارد. متعاقب این وضعیت، مقاومت نمونه مسلح‌‌شده و حاوی 15% افزودنی، حدود 1/8 برابر آستانه مجاز برای موفقیت تثبیت بدست آمد. علت این رفتار، هم‌‌افزایی CCR-SF و الیاف در ارتقاء پیوستگی بین ذرات و کاهش فضای دسترسی برای اندرکنش خاک-آب تعیین شد. با استناد به مجموع نتایج حاصل، استفاده از ترکیب بهینه CCR-SF همراه فیبر به عنوان گزینه‌‌ای ارزان، دوست‌‌دار محیط‌‌‌‌زیست و کارآمد در اصلاح خاک‌‌های مسئله‌‌دار و کاهش پتانسیل پس‌‌گسیختگی آنها توصیه می‌‌شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Performance of fiber and industrial wastes in enhancing soil stabilization process compared to cement

نویسندگان [English]

  • Mazaher Rozbahani 1
  • Amir-reaz Goodarzi 2
  • Seyed Hamid Lajevardi 1
1 Department of Civil Eng., College of Eng., Arak Branch, Islamic Azad University, Arak, Iran
2 2Department of Civil Engineering, College of Engineering, Hamedan Branch, Islamic Azad University, Hamedan, Iran
چکیده [English]

In the present study, the effectiveness of a new combination of industrial wastes including calcium carbide residue (CCR) and silica-fume (SF) along with polypropylene fiber was investigated in comparison with cement for improving soft clays and increasing their durability. The results showed that in normal curing conditions, the use of CCR alone has little effect on the soil geo-mechanical performance. On the other hand, despite the initial favorable performance of cement, the W-D cycle with the failure of cement nanostructures can lead to the disturbance and even complete loss of the soil-bearing capacity. In contrast, the combination of CCR with SF had a prominent role in the stabilization process and a much lower deterioration potential was observed in the presence of the optimal ratio of CCR-SF. According to SEM-EDX and XRD analysis, expansion of solidification and reduction of voids were evaluated as the main factors of the more appropriate response of the recent system. Adding fiber to this series of samples had a significant effect on the growth of tensile strength, better absorption of energy, reduction of cracking ability, and as a result, improving the stability of the soil matrix. Following such a condition, the strength of the reinforced sample containing a 15% additive was found to be about 1.8 times the threshold allowed for successful stabilization. This can be attributed to the synergism of CCR-SF and fibers in improving the particle conjunction and reducing the access of voids for soil-water interaction. Based on the obtained results, the use of an optimal combination of CCR-SF with fiber can be recommended as a low-cost, environmentally friendly, and efficient option in improving the behavior of problematic soils and reducing their post-failure potential.

کلیدواژه‌ها [English]

  • Cement stabilization
  • W-D cycles
  • deterioration of soil properties
  • CCR-SF-Fibers
  • enhanced durability

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نشریه مهندسی عمران امیرکبیر
دوره 56، شماره 2
1403
صفحه 163-180

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