بررسی تاثیر نانوسیلیس بر مشخصات مکانیکی کامپوزیت ‌های سیمانی حاوی الیاف پلی پروپیلن

مظلوم, موسی; نوروزی, سارینا; اکبری جمکرانی, محمد

doi:10.22065/jsce.2020.199749.1936

بررسی تاثیر نانوسیلیس بر مشخصات مکانیکی کامپوزیت ‌های سیمانی حاوی الیاف پلی پروپیلن

نوع مقاله : علمی - پژوهشی

نویسندگان

¹ دانشگاه شهید رجایی

² گروه سازه، دانشکده مهندسی عمران، دانشگاه تربیت دبیر شهید رجایی، تهران، ایران

³ کارشناس ارشد سازه، دانشگاه شهید رجایی، تهران

10.22065/jsce.2020.199749.1936

چکیده

هدف از این تحقیق، بررسی تاثیر افزودن نانوسیلیس و میکروسیلیس بر مشخصات مکانیکی کامپوزیت‌های سیمانی حاوی الیاف پلی پروپیلن است. بدین منظور، آزمایش‌هایی دربرگیرنده ی 13 طرح مخلوط با نسبت آب به مواد سیمانی 28/0 مد نظر قرار گرفتند. یک طرح بدون میکروسیلیس و نانوسیلیس، 4 طرح با درصد نانوسیلیس جایگزین سیمان 5/0% ، 1% ، 3% ، 5% ، 4 طرح با درصد میکروسیلیس جایگزین سیمان 5% ، 7% ، 10% ، 15% و 4 طرح با ترکیب میکروسیلیس و نانوسیلیس در نظر گرفته شد. طبق نتایج آزمایش، نمونه‌‌های ترکیبی دارای میکروسیلیس و نانوسیلیس، نتیجه‌ی بهتری نسبت به نمونه‌های حاوی ذرات نانوسیلیس یا میکروسیلیس به تنهایی داشتند. در واقع، نتایج آزمایش های 28 روزه نشان داد که ترکیب 10% میکروسیلیس و1% نانوسیلیس بهترین نتیجه را در مقاومت های فشاری و کششی و خمشی این کامپوزیت ایجاد کرد. مقدار 32/61 مگاپاسکال مقاومت فشاری با 69/44 درصد افزایش و 319/4 مگاپاسکال مقاومت کششی با 88/34 درصد افزایش و 971/6 مگاپاسکال مقاومت خمشی با 37/30 درصد افزایش مقاومت نسبت به نمونه‌ی شاهد را داراست. 5. مقدار نانوسیلیس بیشتر از 3 درصد، هم در نمونه‌های ترکیبی هم در نمونه‌های بدون میکروسیلیس ، نتیجه‌ی منفی نسبت به نمونه‌ی شاهد داشته است. به عنوان مثال در نمونه‌ی حاوی 5 درصد نانوسیلیس و بدون میکروسیلیس، مقدار 41/37 مگاپاسکال مقاومت فشاری و درصد تغییرات نسبت به نمونه‌ی شاهد 72/11- درصد می‌باشد. 4. نتایج آزمایش میکروسکوپ الکترونی روبشی نشان می‌دهد که نمونه های حاوی نانوسیلیس چگال‌تر و نفوذ ناپذیر تر از نمونه های حاوی میکروسیلیس به تنهایی است.

کلیدواژه‌ها

موضوعات

تحلیل، طراحی و اجرای سازه های بتنی

عنوان مقاله [English]

The effect of nanosilica on the mechanical properties of cementitious composites containing polypropylene fibers

نویسندگان [English]

Moosa Mazloom ¹
Sarina Norouzi ²
Mohammad Akbari Jamkarani ³

¹ Shahid Rajaee Teacher Training University

² Structural Engineering, Civil Engineering Department, Shahid Rajaee Teacher Training University, Tehran, Iran

³ M.Sc. in Structural Engineering, Shahid Rajaee UniversityT Tehran

چکیده [English]

The purpose of this study is to investigate the effects of adding nanosilica and microsilica on the mechanical properties of cementitious composites containing polypropylene fibers. For this purpose, 13 composite mixes with the water to cement ratio of 0.28 were considered. One mix without microsilica and nanosilica, 4 mixtures with 0.5%, 1%, 3% and 5% nanosilica replacement levels, 4 mixes with 5%, 7%, 10%, 15% of microsilica, and 4 mixtures with the combination of microsilica and nanosilica were investigated. According to the results of the experiments, the composite samples containing microsilica and nanosilica had better results than the samples containing only one of these particles. In fact, the results of 28-day tests showed that the combination of 10% microsilica and 1% nanosilica produced the best cementitious composite according to compressive, tensile and flexural tests.The compressive strength was 61.32 MPa, which was 44.69 percent higher than the control mix, the tensile strength was 4.319 MPa with 34.88 percent improvement, and the flexural strength was 6.971 MPa with 30.37 percent improvement from the control mix. Using more than 3 percent of microsilica had negative effects in all circumstances comparing to the control mix. For example, the ones containing 5 percent of nanosilica and without microsilica had the compressive strength of 37.41 MPa, which was 11.72 percent lower than the control mix.

کلیدواژه‌ها [English]

Microsilica
Cementitious composite
fiber
Nanosilica
Polypropylene

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