تأثیر استفاده از نانوسیلیس بر بهبود خصوصیات مهندسی خاک‌های مارنی اصلاح‌شده با آهک

نوع مقاله : پژوهشی

نویسندگان

هرمزگان

چکیده

خاک­های مارنی از خاک­های مسئله­دار هستند که در صورت قرار گرفتن در معرض جریان آب به‌سهولت فرسایش می­یابند و مشکلاتی را در پایداری بستر پروژه­های عمرانی ایجاد می­نمایند. یکی از روش­های اصلاح شیمیایی خاک استفاده از مواد افزودنی مانند آهک، سیمان و نانوذرات است. در پژوهش حاضر تأثیر افزودن نانوسیلیس بر عملکرد آهک در بهبود خصوصیات مهندسی خاک­های مارنی و تشکیل ترکیبات جدید ناشی از فرایند تثبیت بررسی شده‌است. در این راستا پس از تعیین خصوصیات ژئوتکنیکی خاک مارن، بهبود ویژگی­های مهندسی نمونه­های تثبیت‌شده با درصدهای مختلف آهک شکفته و نانوسیلیس بعد از پایان دورۀ عمل­آوری از طریق انجام آزمایش­های مختلف مکانیکی (حدود اتربرگ، دانه‌بندی، رسوب و مقاومت فشاری محدودنشده (UCS)) و ریزساختاری (pH، پراش اشعۀ ایکس (XRD)) تجزیه‌و‌تحلیل شد. براساس نتایج پژوهش حاضر حضور نانوسیلیس در سیستم خاک مارنی- آهک، منجر به افزایش فعالیت­های پوزولانی و رشد نانوساختارهای هیدرات سیلیکات کلسیم (C-S-H) و هیدرات آلومینات کلسیم (C-A-H) و توزیع یکنواخت این نانوساختارها می­شود. هم‌چنین مقاومت فشاری نمونه­های اصلاح‌شده با ترکیب نانوسیلیس و آهک متناسب با افزایش مادۀ افزودنی نانوسیلیس روند کاملاً صعودی دارد. براساس نتایج پژوهش حاضر خصوصیات مهندسی خاک­های مارنی در نمونۀ اصلاح‌شده با 6% آهک و 1% نانوسیلیس، میزان مقاومت فشاری در 7 روز اول به kg/cm2 45/18 افزایش یافته و نسبت‌به نمونۀ مرجع مقاومت فشاری 18 برابر افزایش یافته‌است

کلیدواژه‌ها

عنوان مقاله [English]

The Effect of Combined Nanosilica and Lime on the Improvement of the Marl Soil Engineering Properties

نویسندگان [English]

  • Mohammad Amiri
  • adel Asakereh
  • aminhosein farokhdel
University of Hormozgan
چکیده [English]

Marls are problematic soils, which easily erode if they are exposed to water flow and problems in the stability of the bedding of construction projects can be occurred. One of the methods for soil chemical modification is the use of additives such as lime, cement and nanoparticles. The effect of adding nano-SiO2 on the lime performance on the enhancement of the improvement process of the marl soil engineering properties and the formation of new compounds due to the stabilization process has been investigated in the present study. In this regard, after determining the geotechnical properties of Marl soil, improvement of engineering properties of samples stabilized with various percentages of lime and nano-SiO2 after the end of the curing period was analyzed by performing large-scale experiments (Atterberg limits, aggregation, deposition and unconstrained compressive strength (UCS), and microstructure ((pH) and X-ray diffraction (XRD)). According to the results of this study, the presence of nano-SiO2 in the marl-lime soils system has led to increased pozzolanic activities and growth of calcium silicate hydrate (C-S-H) and calcium aluminate hydrate (C-A-H) nanostructures and uniform distribution of these nanostructures. The compressive strength of the modified samples with the combination of nano-silica and lime proportional to the increased nano-silica additive has a quite ascending trend. Based on the results of the present study, the development rate of improvement of marl soil engineering properties in a modified specimen with 6% lime and 1% nano-SiO2 increased the compressive strength in the first 7 days by 18.45 kg/cm2 and the compressive strength increased by 18 times compared to the reference specimen.

کلیدواژه‌ها [English]

  • Marl
  • Lime
  • Nano-SiO2
  • UCS
  • C-S-H
  • XRD

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