مطالعه و بررسی عملکرد بتن پودری واکنش‌پذیر حاوی فنر فلزی بازیافتی و مقایسه آن با بتن حاوی الیاف فولادی در محیط اسیدی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری سازه، دانشکده مهندسی عمران، دانشگاه سمنان

2 عضو هیات علمی دانشگاه سمنان

3 مربی، دانشکده مهندسی عمران، دانشگاه گرمسار

چکیده

بتن پودری واکنش‌پذیر از مواد ترکیبی سیمانی تشکیل شده است که علاوه بر استفاده در صنعت، از مزایای اقتصادی و زیست محیطی مطلوبی نیز برخوردار است. در این مقاله به بررسی عملکرد بتن پودری واکنش‌پذیر حاوی فنر فلزی بازیافتی و مقایسه آن با بتن پودری واکنش‌پذیر حاوی الیاف فولادی تحت شرایط اسیدی پرداخته شد. بدین منظور جهت انجام آزمایش‌های مقاومت فشاری و کششی طبق استانداردC39 ASTM ، نمونه‌ها در قالب‌های استوآن‌های فلزی استاندارد به ابعاد 10×20 سانتی مترمربع در دمای معمولی )حدود 25 درجه سانتیگراد( با مقدار استفاده 3/0 و 6/0 درصد حجمی بتن از الیاف فولادی و فنر فلزی بازیافتی ساخته شدند. نمونه‌ها در محیط حاوی 0 ،%5 %و 10 %سولفات منیزیم در مدت 28 روز عمل آوری شدند. نتایج نشان داد که افزودن فنر فلزی بازیافتی و الیاف فولادی به بتن پودری واکنش‌پذیر باعث افزایش 50 تا 60 درصدی مقاومت فشاری و کششی شده است. همچنین نمونه‌های حاوی فنر فلزی بازیافتی در برابر محیط‌های اسیدی تحمل و مقاومت بیشتری نسبت به نمونه‌های حاوی الیاف فولادی دارند. در مجموع با توجه به اینکه اختلاف افزایش مقاومت نمونه‌ها چندان زیاد نبوده، لذا استفاده از فنر فلزی بازیافتی در بتن پودری واکنش‌پذیر به لحاظ فنی و اقتصادی توجیه پذیر می‌باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

An Investigation of RPC containing Recycled Metal Spring and its Comparison with the Concrete including Steel Fibers Exposed to the Acidic Environment

نویسندگان [English]

  • ghasem pachideh 1
  • majid gholhaki 2
  • amin moshtagh 3
1 Phd Candidate, civil faculty, semnan university
3 MSc, Faculty of Civil Engineering, Garmsar University
چکیده [English]

Reactive Powder Concrete (RPC) is a developing composite cementitious material that will allow the concrete industry to optimize material use, generate economic benefits and build structures that are robust, durable and environmentally friendly. This paper deals with the performance of reactive powder concrete (RPC) containing recycled metal spring and its comparison with that of including steel fibers exposed to the acidic environments. To this end, several specimens were built in 10×20 cm2 metal cylindrical formworks in ambient temperature (around 25°c) containing 0.3 and 0.6% of steel fibers and recycled metal spring in concrete volume, respectively so as to conduct the tensile and compressive strength tests in compliance with ASTM C39. Subsequently, the specimens were cured in an environment with magnesium sulfate content of 0, 5 and 10% within 28 days. Based on the results, the addition of recycled metal spring and steel fibers to the RPC managed to improve the compressive and tensile strengths by 50 to 60%. Moreover, the specimens containing recycled spring better withstood against the acidic environments in comparison with the specimens, including steel fibers. In general, it was found that due to the negligible difference between the strength of the specimens, application of metal recycled spring in reactive powder concrete is technically and economically justifiable.

کلیدواژه‌ها [English]

  • Reactive Powder Concrete (RPC)
  • Magnesium Sulfate
  • Metal Recycled Spring
  • Steel Fibers
  • Crack
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