مقایسه عملکرد سیمان، سرباره کوره ذوب‌آهن (GGBS) و GGBS فعال شده در بهسازی یک خاک رسی

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی و فناوری، دانشگاه تهران.

چکیده

در این کار پژوهشی، اثر سیمان، سرباره دانه‌ای کوره ذوب‌آهن (GGBS) و سرباره فعال‌شده با اکسیدمنیزیم (MgO) به‌عنوان مواد افزودنی در بهسازی یک خاک رسی مورد مطالعه و ارزیابی قرار گرفتند. برای فعال‌سازی GGBS از اکسیدمنیزیم با نسبت اختلاط 3 (سرباره) به 1 (اکسیدمنیزیم) استفاده گردید. بهسازی خاک در درصدهای وزنی 5، 10 و 15 از مواد افزودنی مذکور انجام شد. آزمایش‌های حدود اتربرگ و تراکم استاندارد روی خاک‌های اختلاط‌یافته با مواد افزودنی مذکور انجام شد. همچنین نمونه‌های لازم از این مواد اختلاط‌یافته جهت تعیین مقاومت تک‌محوری و بررسی ریزساختار خاک با انجام آزمایش میکروسکوپ الکترونی روبشی (SEM) تهیه گردید. مقاومت نمونه-های تهیه شده در زمان‌های عمل‌آوری 7، 14 و 28 روز تعیین گردیدند. نتایج نشان داد که مقاومت نمونه‌ها تابعی از درصد مواد افزودنی مورد استفاده و زمان عمل‌آوری می-باشد. علاوه بر این مقایسه نتایج نشان داد که در درصد مشخص و زمان عمل‌آوری معین، مقاومت نمونه‌های بهسازی شده با سرباره از نمونه‌های حاوی سرباره فعال شده کمتر می‌باشد. همچنین با بررسی و تحلیل نتایج آزمایشSEM مشخص شد که با افزودن مواد افزودنی مذکور به خاک رسی، مواد سیمانته‌کننده‌ای در اثر عمل متقابل آنها با خاک طی فرآیند شیمیایی تشکیل می‌شود که منجر به اتصال ذرات خاک و مواد افزودنی به یکدیگر و در نتیجه تشکیل جسمی با مقاومت بالا می‌گردد. همچنین در این پژوهش ارزیابی اقتصادی برای بهسازی خاک با مواد افزودنی مذکور انجام شد و مناسب‌ترین ماده افزودنی جهت این امر پیشنهاد گردید.

کلیدواژه‌ها

عنوان مقاله [English]

Comparison of the effect of Cement, Ground Granulated Blast Furnace Slag (GGBS), and activated GGBS on stabilization of a clay soil

نویسندگان [English]

  • amir jahani
  • Ali Raeesi Estabragh
  • hossein khajepour
  • Mohadeseh Amini
Geotechnical Engineering, Tehran University, Tehran, Iran.
چکیده [English]

In this research work, the effect of cement, Ground Granulated Blast Furnace Slag (GGBS), and activated GGBS with MgO on the treatment of a clay soil was studied through conducting the experimental tests. The ratios of 1:3 was considered for making the mixtures GGBS: MgO. The used percentages of additives were 5, 10, and 15%. Various experimental tests such as Atterberg limits, standard compaction, compressive strength (UCS), and Scanning Electron Microscopy (SEM) tests were performed on the samples with different percentages of additives. Also, UCS tests were conducted on the compacted samples at curing times of 7, 14, and 28 days. The results of UCS indicated that all used additives are effective in improving the behaviors of soil, and their amount is dependent on the percentage of used additives and curing time. In addition, a comparison of the results showed that in a given percentage of additives and curing time, activated GGBS is more effective than GGBS alone in improving soil samples. Based on the SEM results, it was found that the increasing strength of stabilized soil is resulted from the interaction between soil particles and additives materials. An economical evaluation of soil improvement with used additives was also carried out and the best one was proposed for conducting in the field.

کلیدواژه‌ها [English]

  • Clay soil improvement
  • Cement
  • GGBS
  • MgO
  • activated GGBS

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