Outline

  • Abstract
  • Keywords
  • 1. Introduction
  • 2. Materials
  • 2.1. Clayey Soils
  • 2.2. Scrap Tire Rubber Fibers
  • 2.3. Polyethylene Fibers
  • 2.4. Polypropylene Fibers
  • 3. Testing Programme
  • 3.1. Preparation of Clayey Soil–fiber Mixtures
  • 3.2. Preparation of Reinforced Soil Samples
  • 3.3. Unconfined Compression Tests
  • 3.4. Shear Box Tests
  • 3.5. Resonant Frequency Tests
  • 4. Results and Discussion
  • 4.1. Effects of Scrap Tire Rubber Fibers on the Ucs
  • 4.2. Effects of Synthetic Fibers on the Ucs
  • 4.3. Effects of Fiber Lengths and Sample Dimensions on the Ucs
  • 4.4. Effect of Scrap Tire Rubber and Synthetic Fibers on the Shear Strength Parameters
  • 4.5. Effect of Scrap Tire Rubber and Synthetic Fibers on the Dynamic Behaviors of Soils
  • 5. Conclusions
  • Acknowledgements
  • References

رئوس مطالب

  • چکیده
  • کلید واژه ها
  • 1. مقدمه
  • 2. مواد
  • 1.2. خاک های رس
  • 2.2. فیبرهای ضایعات لاستیک تایر
  • 3.2. فیبرهای پلی اتیلن
  • 4.2. فیبرهای پلی پروفیلین
  • 3. برنامه ی آزمایشی
  • 1.3. آمادگی ترکیبات خاک رس- فیبر
  • 2.3. آماده سازی نمونه های خاک تقویتی
  • 3.3. تست های تراکم غیر محصور
  • 4.3. تست های جعبه ی برش
  • 5.3. تست های فرکانس تشدیدی
  • 4. نتایج و بحث
  • 1.4. تاثیرات فیبرهای ضایعات لاستیک تایر در UCS
  • 2.4. تاثیرات فیبرهای مصنوعی بر UCS
  • 3.4. تاثیرات طول فیبر و ابعاد نمونه در UCS
  • 4.4. تاثیر ضایعات لاستیک تایر و فیبرهای مصنوعی بر پارامترهای مقاومت برش
  • 5.4. تاثیرات ضایعات لاستیک تایر و فیبر مصنوعی بر رفتارهای پویای خاک ها
  • 5. نتیجه گیری

Abstract

A number of studies have been conducted recently to investigate the influence of randomly oriented fibers on the geotechnical behavior of grained soils. However, very few studies have been carried out on fiber-reinforced clayey soils. Therefore, this experimental work has been performed to investigate the influence of randomly oriented fiber inclusion on the geotechnical behavior of clayey soils. This research evaluates the use of waste fiber materials such as scrap tire rubber, polyethylene, and polypropylene fiber for the modification of clayey soils. This investigation focuses on the strength and dynamic behavior of the reinforced soils with randomly included waste fiber materials. The unreinforced and reinforced samples were subjected to unconfined compression, shear box, and resonant frequency tests to determine their strength and dynamic properties. These waste fibers improve the strength properties and dynamic behavior of clayey soils. The scrap tire rubber, polyethylene, and polypropylene fibers can be successfully used as reinforcement materials for the modification of clayey soils.

Keywords: - - - - -

Conclusions

  • Both lengths and contents of the rubber fibers played an important role in the development of the UCS of the reinforced samples. In general, the UCS values increased with increasing tire rubber fiber contents up to 2% and then decreased. Both the length and the content of synthetic fibers improved the UCS values. The polyethylene and polypropylene fibers increased the UCS values for all contents with a maximum at 0.2%.
  • For maximum improvement of the UCS values, the fiber length has to be increased with the sample dimension. The UCS values of all samples significantly increased with fiber contents at optimum fiber length.
  • In general, tire rubber and synthetic fibers increased the cohesion values. The maximum cohesion values were observed for 10-mm long fibers. The internal friction angle value of each reinforced sample increased in a non-linear way.
  • The tire rubber, polyethylene, and polypropylene fibers increased damping ratio and shear modulus. The maximum values were observed for 2% tire rubber fibers of 10-mm length and 0.2% polyethylene and polypropylene fibers of 15 mm.
  • The UCS values of all reinforced samples obtained from the tests may have been underestimated. The real improvement in the UCS may be higher.
  • The waste fibers such as scrap tire rubber, polyethylene, and polypropylene fibers can be used to improve the strength and dynamic behavior of clayey soils in geotechnical applications. In addition, these reinforcement fibers are waste materials, so the soil stabilization with waste fiber can potentially reduce stabilization costs.
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