ارزیابی تأثیر نانوسیلیس و فوق روان کننده بر مقاومت سایندگی بتن در سازه های آبی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 نیک‌تابان‌تز

2 عضو هیئت علمی دانشگاه شهید چمران اهواز، گروه سازه‌های آبی

3 دانشجو/دانشگاه شهیدچمران اهواز

چکیده

از بتن معمولی به ‌دلیل در دسترس بودن اجزای آن، به­ صورت گسترده‌ در سازه‌های آبی استفاده می‌شود. مقاومت بتن می‌تواند با افزودن مقداری اندک از مواد ترکیبی به نام نانو مواد، به طور قابل توجهی افزایش یابد و باعث افزایش طول عمر بتن شود. تحقیق حاضر اثر مواد افزودنی نانوسیلیس و فوق روان‌کننده از نوع پلاستیکرت R-B را بر مقاومت سایشی بتن بررسی کرده ‌است. برای ساخت نمونه‌های بتن از سیمان تیپ 2 و 5 استفاده شد. نانوسیلیس به مقدار 2، 4، 6، 8 و 10 و فوق روان­کننده به مقدار 5/0، 8/0، 1/1، 4/1 و 7/1 درصد وزنی سیمان مورد آزمون در نظر گرفته شد. کلیۀ آزمایش‌ها در آزمایشگاه بتن در دوره­های عمل‌آوری 7، 28 و 42 روزه اجرا گردید. در مجموع، 60 آزمایش مختلف سایشی روی نمونه‌ اجرا شد. در این آزمایش­ها مقاومت ساییدگی مصالح درشت دانۀ بتن با سایش و ضربه در دستگاه لوس آنجلس تعیین گردید. نتایج نشان می­دهد که با اضافه کردن نانوسیلیس و فوق روان‌کننده به بتن‌هایی با سیمان تیپ 2 و 5، مقاومت سایشی آنها در مقایسه با بتن معمولی، ابتدا افزایش و سپس کاهش می‌یابد. به­‌ طوری‌ که مقدار افت جرم با افزایش نانو سیلیس به ترتیب تا 6 و 8 درصد وزنی سیمان، کاهش و پس از آن افزایش خواهد یافت و در مقادیر ذکر شده، کمترین کاهش جرم اتفاق می‌افتد که مقدار آن نسبت به بتن معمولی 7، 28 و 42 روزه به ترتیب 40، 31 و 50 درصد برای سیمان تیپ 5 و 27، 32 و 50 برای سیمان تیپ 2 کمتر خواهد بود. همچنین در این ‌تحقیق و برای مقاومت‌ سایشی بر اساس نتایج به دست آمده، مقدار بهینه نانوذرات سیلیس 6 درصد و فوق روان‌کننده 8/0 درصد وزنی سیمان تیپ 2 و برای سیمان تیپ 5 به ‌ترتیب 8 و 8/0درصد وزنی، تعیین ‌شد.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Nano-Silica and Superplasticizer on Concrete Abrasive Resistance of Hydraulic Structures

نویسنده [English]

  • sakineh soleymaninia 3
چکیده [English]

Conventional concrete is widely used in hydraulic structures because of its availability. It is, however, possible to add compound nano-materials with very low weights to strengthen and increase the durability of concrete and, in this way, to increase its lifespan. The present research examined the effects of nano-silica and superplasticizer (resin-based plasticrete) additives on the abrasive strength of the concrete compared to conventional concrete. The test scenarios to create the desired concrete types used cement types 2 and 5. Nano-silica was added at 2%, 4%, 6%, 8%, and 10% of the weight of the cement. The super-plasticizer was tested at 0.5%, 0.8%, 1.1%, 1.4%, and 1.7%. All tests were conducted at the Niktaban-Dez laboratory over processing periods of 7, 28, and 42 d. A total of 60 tests for level of abrasion were done on the specimen. The results showed that by adding nano-silica and super-plasticizer to concrete made with cement types 2 and 5 initially increased and then decreased the abrasive strength of the concrete compared to conventional concrete. The mass loss with the addition of 6% and 8% nano-silica decreased and then increased. The minimum mass at 7, 28, and 42 d decreased 40%, 31% and 50% for type 5 cement and 27%, 32% and 50% for type 2 cement, respectively, over conventional concrete. The results showed that the abrasive strength with the optimum percentage of nano-silica and superplasticizer, respectively, was 6% and 0.8% for type 2 cement and 8% and 0.8% for type 5 cement.

کلیدواژه‌ها [English]

  • Abrasive Strength
  • Concrete Admixture
  • Concrete Durability
  • RB Plasticrete

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