بررسی اثر ترکیب سیمان و نانوسیلیس بر روی مقاومت برشی خاک ماسه ای بابلسر

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده عمران، دانشگاه صنعتی نوشیروانی بابل،مازندران، ایران

2 دانشکده عمران، موسسه آموزش عالی صنعتی مازندران، مازندران، ایران

3 دانشکده عمران، دانشگاه تربیت دبیر شهید رجایی، تهران، ایران

چکیده

در بسیاری از موارد خاک طبیعی محل مقاومت لازم را نداشته و نیاز به به سازی دارد. از جمله این روش‌ها، اصلاح خاک با استفاده از مواد افزودنی است. در این روش خصوصیات مهندسی خاک با مخلوط شدن با یک یا چند ماده دیگر ارتقاء می‌یابد. نانوسیلیس که یک پوزولان بسیار فعال جهت انجام واکنش‌های سیمانی شدن است، نیز می‌تواند به عنوان تثبیت کننده در نظر گرفته شود. در این تحقیق به بررسی تاثیر ترکیبی از سیمان و نانو سیلیس بر مقاومت برشی خاک ماسه‌ای بابلسر در فواصل زمانی 7 و 28 روزه پرداخته شده است. آزمایش برش مستقیم بر روی نمونه‌های حاوی 4، 6 و8 درصد وزن خشک ماسه، سیمان و30،10 و50 درصد وزنی سیمان، نانوسیلیس در تراکم 98 درصد ترتیب داده شده است. نتایج نشان داد که افزودن نانوسیلیس به سیمان تا 30درصد جایگزینی با سیمان، باعث افزایش 2 برابری مقاومت برشی نمونه‌ها، نسبت به نمونه هایی که فقط از سیمان استفاده شده است می‌شود و با افزایش بیش از این مقدار مقاومت برشی نمونه‌ها کاهش می‌یابد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Analyzing the Effect of Nano-Silica-Cement Mixture on Shear Strength of Babolsar Sandy Soil

نویسندگان [English]

  • I. Shooshpasha 1
  • M. Abbasi 2
  • H. Najafniya 3
1 Geotechnical Engineering Department, Faculty of Civil Engineering, Babol Nushirvani University of Technology, Mazandaran, Iran
2 Faculty of Civil Engineering, Mazandaran Institute of Technology, Mazandaran, Iran
3 Faculty of Civil Engineering, Shahid Rajaee teacher training University, Tehran, Iran
چکیده [English]

In many cases, natural soil does not have the required strength and needs to be improved. One of these methods is soil improvement with the use of additives. In this method the engineering properties of soil are improved by being mixed with one or more other materials. Nano-silica which is a very active pozzolan can also be considered as a stabilizer to perform cementation reactions. In this study, the effect of cement and nanosilica mixture on Babolsar sandy soil shear strength within 7 and 28 days has been studied. Direct shear tests are performed on specimens containing 4, 6 and 8 percent of dry weight of sand, cement and 10, 30 and 50% of the weight of cement nano-silica with the density of 98%. The results showed that the addition of nano-silica to cement up to a certain percentage increases the shear strength and shear strength decreases with additional amounts. In this study 30 percent increase in nano-silica is followed by the optimized shear strength improvement

کلیدواژه‌ها [English]

  • Soil improvement
  • Shear Strength
  • Nano-Silica-Cement
  • Babolsar Sandy Soil
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