مطالعه آزمایشگاهی اثر اضافه شدن ضایعات کارخانه سنگ بر مقاومت خاک تثبیت شده با آهک و سیمان در برابر چرخه های ذوب و یخبندان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران

2 گروه عمران، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران

3 گروه عمران، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران.

4 گروه مهندسی عمران، واحد دولت آباد، دانشگاه آزاد اسلامی، دولت آباد، ایران

چکیده

در این مقاله مقادیر وزن مخصوص خشک ماکزیمم، رطوبت بهینه و مقاومت برشی نمونه‌های تثبیت شده خاک ماسه لای‌دار بهسازی شده با ضایعات خرده سنگ حاصل از فعالیت صنایع سنگبری، مورد بررسی قرار گرفته است. اثر مقدار خرده سنگ، سیمان، آهک، زمان عمل آوری و تعداد سیکل‌های ذوب و یخبندان بعنوان متغیرهای اصلی مورد بررسی قرار گرفته است. نتایج آزمایش‌های پراکتور اصلاح شده نشان می‌دهد که وزن مخصوص خشک ماکزیمم با افزایش خرده سنگ، سیمان یا آهک روند افزایشی دارد و همچنین رطوبت بهینه با افزایش خرده سنگ کاهش چشم گیری پیدا می‌کند. نتایج آزمایش CBR نشان می‌دهد که در تمامی نمونه‌ها، افزایش مدت زمان عمل‌آوری باعث افزایش چشم‌گیری در مقادیر CBR شده است. افزایش مقدار خرده سنگ در نمونه‌های تثبیت شده با آهک و سیمان باعث افزایش CBR شده است. افزایش مقادیر سیمان یا آهک در نمونه‌های تثبیت شده با مقادیر یکسانی از خرده سنگ در یک مدت زمان عمل آوری خاص، باعث افزایش مقاومت شده است. مقایسه نتایج بین نمونه‌های تثبیت شده با سیمان و آهک نشان می‌دهد که نمونه‌های تثبیت شده با سیمان مقاومت بیشتری نسبت به نمونه‌های تثبیت شده با آهک در شرایط یکسان دارد. نتایج آزمایش‌های ذوب و یخبندان نیز نشان می‌دهد که افزایش تعداد سیکل‌های ذوب و یخبندان موجب کاهش CBR نمونه-های تثبیت شده با آهک و سیمان می‌شود. اثر تعداد سیکل‌های ذوب و یخبندان بر کاهش مقاومت نمونه‌ها با افزایش مقدار خرده سنگ، چشمگیرتر است.

کلیدواژه‌ها


عنوان مقاله [English]

Laboratory study on the effects of stone factory waste on the resistance of cement or lime stabilized soil against freeze-thaw cycles

نویسندگان [English]

  • Mohsen Salehi 1
  • Meysam Bayat 2
  • Mohsen Saadat 3
  • Masoud Nasri 4
1 Department of Civil Engineering, Najafabad branch, Islamic Azad University, Najafabad, Iran
2 Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
3 Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran.
4 , Department of Civil Engineering, Dolatabad branch, Islamic Azad University, Dolatabad, Iran
چکیده [English]

In this paper, the maximum dry density, Optimum moisture content and CBR value of stabilized soil specimens mixed with crushed stone obtained from rock factory waste have been investigated. The effects of the crushed stone waste, cement or lime contents, curing time and number of freeze-thaw cycles have been investigated. The results of standard Proctor compaction tests show that the maximum dry density has an increasing trend due to the increase in crushed stone, cement or lime content, and also the optimum moisture decreased significantly with the increase of the crushed stone content. The results of the CBR test show that the increase in processing time caused a significant increase in CBR values. Increasing the crushed stone waste in lime or cement-stabilized specimens results in an increase of CBR value. Increasing the cement or lime content increases the strength of the specimens for a given crushed stone content and curing time. Comparing the results between cement and lime-stabilized specimens shows that cement-stabilized specimens have more resistant than lime-stabilized specimens under the same condition. The results of freezing-thawing tests show that increasing the number of freeze-thaw cycles decreases the CBR value of lime or cement-stabilized specimens. The effect of the number of freeze-thaw cycles on reducing the resistance of the specimens is more significant with increasing the crushed stone content.

کلیدواژه‌ها [English]

  • Silty sand
  • Crushed stone
  • Stabilization
  • cement
  • lime
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