مهندسی سازه و ساخت

مهندسی سازه و ساخت

بررسی تاثیرافزودن نانوسیلیس و سیمان بر مقاومت تک محوری رسهای نرم

نوع مقاله : علمی - پژوهشی

نویسندگان
1 دانشجوی دکترای ژئوتکنیک،دانشکده مهندسی، گروه عمران، واحداراک،دانشگاه ازاد اسلامی،اراک،ایران
2 دانشیار،دانشکده مهندسی،گروه مهندسی عمران، واحد اراک، دانشگاه آزاد اسلامی، اراک، ایران
3 استاد،مرکزتحقیقات مهندسی سطح پیشرفته ونانومواد،گروه فیزیک،واحداهواز،دانشگاه ازاد اسلامی،اهواز،ایران
چکیده
خاک‌های رسی با رطوبت بیش از۳۵درصدیا نزدیک به حدروانی به عنوان رس نرم شناخته می‌شوند. این خاک‌ها دارای مقاومت تک محوری کمتر از۲۵کیلوپاسکال می‌باشند. به منظور بهبود در مقاومت این خاک‌ها مواد افزودنی ازجمله سیمان و نانو ذرات به آنها اضافه می‌شود. این مواد افزودنی با خاک ترکیب می‌شوند که به این ترکیب ایجاد شده، خاک مخلوط سیمانی شده گفته می‌شود. لذادر این تحقیق، تاثیر افزودن همزمان نانوسیلیس با سیمان بر تغییرات مقاومت تک محوری رس‌های نرم مورد بررسی قرار گرفت. برای این منظوریک درصد رطوبت ثابت ۴۰درصد برای کلیه نمونه‌‌ها درنظر گرفته شد. تغییرات سه عامل درصد سیمان ونانوسیلیس مصرفی و دوره عمل‌‌آوری نمونه‌ها به عنوان عوامل موثر مورد بررسی قرار گرفت. برای سیمان سه درصد ۸و۱۰و۱۲درصد وزنی نسبت به خاک خشک درنظرگرفته شد. نانوسیلیس در۸ سطح از صفرتا۴/۱درصدنسبت به وزن خاک خشک و دوره عمل‌آوری نیزسه دوره ۷و۱۴و۲۸ روزه در نظر گرفته شد. درمجموع ۷۲سری نمونه ساخته شد و مقاومت تک محوری آنها اندازه گیری گردید. نتایج نشان داد که استفاده از نانوسیلیس تا ۲/۱درصد بهمراه سیمان مقاومت تک محوری را نسبت به حالت فقط استفاده از سیمان تنها بطورمتوسط در دوره ۷روزه حدود ۱۷۰درصد در۱۴روزه ۱۲۰درصدودر۲۸روزه ۴۸درصد افزایش داده است. علاوه براین با اضافه نمودن ۲/۱درصدنانوسیلیس به سیمان ۸درصد،۴درصد سیمان مصرفی، نسبت به حالت سیمان ۱۲درصد کاهش یافت. هم چنین در محدوده آزمایشات انجام شده برای تخمین مقاومت تک محوری نمونه‌‌ها براساس مقادیر درصد سیمان و نانو سیلیس مصرفی و دوره عمل‌آوری نمونه‌ها روابطی بدست آمد. علاوه براین میزان میانگین تفاضل مقاومت تک محوری بدست آمده از این روابط با مقادیر اندازه گیری شده محاسبه گردیدکه این میانگین اختلاف برای کل نمونه ها ۱تا ۳درصد بوده است .
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Exploring the effect of adding nano-silica and cement on the unconfined compressive strength of soft clay

نویسندگان English

Khaeroallah Masihpour 1
Sayed Hamid lajevardi 2
S.Mohammad Mirhosseini 2
Farid Jamali-Sheini 3
1 PhD Candidate,Department of Civil Engineering, Arak Branch, Islamic Azad University, Arak, Iran
2 Associate Professor, Department of Civil Engineering, Arak Branch, Islamic Azad University, Arak, Iran.
3 Professor, Advanced Surface Engineering and Nanomaterials Research Center, Department of Physics, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran.
چکیده English

Clay soils with a water content of more than 35% or close to the liquid limit are known as soft clay. These soils have an unconfined compressive strength (UCS) of less than 25 kilopascals. In order to improve the strength of these soils, additives such as cement and nanoparticles are added to them. These additives are combined with soil, which is called cemented mixed soil. Therefore, this research investigated the effect of the simultaneous addition of Nano-silica with cement on changes in UCS of soft clays with low plasticity (cl). The research considers soil with a constant water content of 40%, exceeding its liquid limit, for all samples. The changes in three factors, the cement and Nano-silica content consumed and the curing time of the specimens, were investigated as effective factors. For cement, 8%, 10%, and 12% relative to the weight of dry soil were considered. Nano-silica at eight levels from zero to 1.4% relative to the weight of dry soil and three curing times 7, 14, and 28 days were considered. A total of 72 series of specimens were made, and the unconfined compressive strength was measured. The results indicate that using nano-silica up to 1.2% in combination with cement increases the UCS by an average of about 170% after seven days, 120% after 14 days, and 48% after 28 days compared to using cement alone. Additionally, adding nano-silica led to a reduction of up to 4% in cement usage. Equations were derived based on the consumption rates of cement and nano-silica, along with the curing period, to estimate the uniaxial strength of the samples. The average difference between the estimated and measured values for all samples ranged from 1% to 3%.

کلیدواژه‌ها English

Soft clay
Cemented mixed soil
Nano silica
UCS
Curing time
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