مطالعه برخی خواص دوامی مرتبط با خوردگی در ملات‌های حاوی سنگدانه‌های طبیعی و بازیافتی با مدول نرمی ثابت

قیاسوند, ابراهیم; رستگار, محمد مهدی; قاسمی, محمدحسین; امی, نوید

doi:10.22065/jsce.2025.512815.3683

مطالعه برخی خواص دوامی مرتبط با خوردگی در ملات‌های حاوی سنگدانه‌های طبیعی و بازیافتی با مدول نرمی ثابت

نوع مقاله : علمی - پژوهشی

نویسندگان

ابراهیم قیاسوند ¹

محمد مهدی رستگار ¹

محمدحسین قاسمی ²

نوید امی ²

¹ استادیار گروه عمران، دانشکده مهندسی ، دانشگاه بوعلی سینا، همدان، ایران

² دانشجوی کارشناسی ارشد، گروه مهندسی عمران، دانشکده مهندسی، دانشگاه بوعلی سینا، همدان، ایران

10.22065/jsce.2025.512815.3683

چکیده

به‌دلیل خواص ضعیف‌تر سنگدانه‌ی بازیافتی مانند جذب آب و تخلخل بیشتر و چگالی کمتر در مقایسه با سنگدانه‌ی طبیعی، بتن‌های ساخته‌شده از مصالح سنگی بازیافتی دارای مشخصات مکانیکی و دوامی ضعیف‌تری در مقایسه با بتن‌های طبیعی هستند. از طرف دیگر، در سازه‌های بتن مسلح، خوردگی آرماتور یکی از مخرب‌ترین پدیده‌هایی است که این سازه‌ها را تهدید می‌کند و با توجه به ضعف دوامی بتن‌های بازیافتی، بررسی پدیده خوردگی در این نوع از بتن‌ها، حائز اهمیت است. مطالعه‌ی حاضر نتایج بررسی آزمایشگاهی تاثیر سنگدانه‌ی بازیافتی بر خواص مقاومتی و دوامی محصولات پایه سیمانی خصوصاً دوام آن‌ها در برابر خوردگی آرماتور را نشان داد. به این منظور، چهار طرح مخلوط، حاوی مقادیر صفر، 50، 75 و 100 درصد سنگدانه‌ی بازیافتی با حداکثر اندازه‌ی اسمی 2/36میلی‌متر و نسبت آب به سیمان برابر 0/6 ساخته شد و آزمایش‌های مقاومت فشاری، جذب آب موئینه، جذب آب حجمی و پتانسیل نیم‌پیل روی آن‌ها انجام شد. پس از انجام آزمایش‌ها و بررسی نتایج مشخص شد که در یک نسبت آب به سیمان برابر، حضور سنگدانه‌ی بازیافتی موجب کاهش مقاومت فشاری، افزایش جذب آب موئینه و جذب آب حجمی می‌شود؛ هرچند مخلوط‌ حاوی 50 درصد سنگدانه‌ی بازیافتی رفتاری نسبتاً مشابه با مخلوط شاهد (حاوی 100 درصد مصالح طبیعی) داشت. ضمناً بر اساس نتایج بدست آمده از آزمایش نیم‌پیل مشخص شد حضور سنگدانه‌ی بازیافتی موجب کاهش پتانسیل نیم‌پیل می‌شود که این موضوع نشان دهنده‌ی آن است که به دلیل تخلخل موجود در این نوع سنگدانه، لایه‌ی محافظ روی آرماتور زودتر از بین رفته و فرآیند خوردگی آغاز می‌گردد.

کلیدواژه‌ها

بتن بازیافتی

خوردگی آرماتور

پتانسیل نیم‌پیل

جذب آب موئینه

سنگدانه‌ی بازیافتی

موضوعات

نقش مصالح در افزایش دوام و مقاومت سازه ها

عنوان مقاله English

Study of Some Corrosion-Related Durability Properties in Mortars Containing Natural and Recycled Aggregates with Constant Fineness Modulus

نویسندگان English

ٍEbrahim Ghiasvand ¹

Mohammad Mahdi Rastegar ¹

Mohammad Hosein Ghasemi ²

Navid Ommi ²

¹ Assistant Professor, Department of Civil Engineering, Faculty of Engineering, Bu-Ali Sina University, Hamedan, Iran

² Master's student, Department of Civil Engineering, Faculity of Engineering, Bu-Ali Sina University, Hamedan, Iran

چکیده English

Recycled aggregates possess weaker properties—like higher water absorption, increased porosity, and lower density—compared to their natural counterparts. Consequently, concretes produced with these recycled materials exhibit inferior mechanical and durability characteristics than natural concretes. Moreover, rebar corrosion poses a significant threat to reinforced concrete structures. Given the reduced durability of recycled concretes, it becomes crucial to investigate corrosion within this specific type of concrete. The current study presented laboratory findings on how recycled aggregates affect the strength and durability of cement-based products, particularly their resistance to rebar corrosion. To achieve this, four different mix designs were prepared, incorporating 0%, 50%, 75%, and 100% recycled aggregates. These mixes featured a maximum nominal size of 2.36 mm and a water-to-cement ratio of 0.6. Subsequently, tests for compressive strength, capillary water absorption, volumetric water absorption, and half-cell potential were conducted. Upon analyzing the results, it was determined that, at a consistent water-to-cement ratio, the inclusion of recycled aggregates led to a decrease in compressive strength and an increase in both capillary and volumetric water absorption. Interestingly, the mix containing 50% recycled aggregate performed quite similarly to the control mixture (which comprised 100% natural materials). Furthermore, half-cell potential test results indicated that recycled aggregates reduce the half-cell potential. This finding were suggested that due to the inherent porosity of recycled aggregates, the protective layer on the rebar deteriorates more quickly, thereby initiating the corrosion process sooner.

کلیدواژه‌ها English

Recycled concrete

Rebar corrosion

Half-cell potential

Capillary water absorption

Recycled aggregate

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