مطالعه برخی خواص مکانیکی و الکتروشیمیایی محصولات پایه سیمانی حاوی سنگدانه‌های طبیعی و بازیافتی با مدول نرمی ثابت

نوع مقاله : مقاله پژوهشی

نویسندگان

1 عضو هیئت علمی دانشگاه بوعلی سینا

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

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

10.22124/jcr.2026.32294.1724

چکیده

به‌دلیل خواص ضعیف‌تر سنگدانه‌های بازیافتی نسبت به سنگدانه‌های طبیعی، بتن‌های حاوی این مصالح، عملکرد مکانیکی و دوامی پایین‌تری دارند. هدف پژوهش حاضر بررسی اثر جایگزینی سنگدانه‌های طبیعی با سنگدانه‌های بازیافتی بر خواص مکانیکی و الکتروشیمیایی ملات سیمانی است. برای این منظور، ملات‌هایی با درصدهای صفر، 50، 75 و 100 سنگدانه‌ی بازیافتی ساخته و تحت آزمایش‌های مقاومت فشاری، نیم‌پیل، پلاریزاسیون خطی و پلاریزاسیون پتانسیودینامیک قرار گرفتند. نمونه‌ها پس از عمل‌آوری 28 روزه طی هشت چرخه‌ی دو هفته‌ای (یک هفته مرطوب، یک هفته خشک) در شرایط کلریدی آزمایش شدند. نتایج نشان داد جایگزینی کامل سنگدانه‌ی طبیعی با بازیافتی موجب کاهش 23 تا 32 درصدی مقاومت فشاری و آغاز زودتر خوردگی آرماتور (چرخه‌ی سوم در برابر چرخه‌ی ششم) شد، در حالی‌که جایگزینی 50 درصد تنها کاهش اندک مقاومت فشاری (حدود 7% در 90 روز و ناچیز در 28 روز) را به همراه داشت. ضمناً در این سطح از جایگزینی شاهد آغاز فرایند خوردگی در چرخه‌ی پنجم بودیم. همچنین افزایش میزان سنگدانه‌های بازیافتی موجب افت کیفیت لایه‌ی انفعالی و کاهش حدود 80 درصدی مقاومت پلاریزاسیون خطی گردید. در مجموع، نتایج نشان داد که استفاده از سنگدانه‌های بازیافتی تا سطح ۵۰ درصد، تأثیر قابل توجهی بر مقاومت فشاری ندارد و تنها اثر اندکی بر خواص الکتروشیمیایی در مقایسه با طرح حاوی ۱۰۰ درصد سنگدانه‌ی طبیعی ایجاد می‌کند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating Some Mechanical and Electrochemical Properties of Cement-Based Products Containing Natural and Recycled Aggregates with Constant Fineness Modulus

نویسندگان [English]

  • Ebrahim Ghiasvand 1
  • Mohammad Mahdi Rastegar 2
  • Mohammad Hosein Ghasemi 3
  • Navid Ommi 3
1 Buali Sina University
2 Assistant Professor, Department of Civil Engineering, Faculty of Engineering, Bu-Ali Sina University, Hamedan, Iran
3 Master's student, Department of Civil Engineering, Faculity of Engineering, Bu-Ali Sina University, Hamedan, Iran
چکیده [English]

Due to the weaker properties of recycled aggregates compared to natural aggregates, concretes containing these materials generally exhibit lower mechanical performance and durability. The aim of the present study is to investigate the effect of replacing natural aggregates with recycled aggregates on the mechanical and electrochemical properties of cement mortar. For this purpose, mortars containing 0, 50, 75, and 100 percent recycled aggregates were prepared and subjected to compressive strength, half-cell potential, linear polarization resistance, and potentiodynamic polarization tests. After 28 days of curing, the specimens were exposed to chloride conditions through eight two-week cycles (one week wet, one week dry). The results indicated that complete replacement of natural aggregates with recycled aggregates led to a 23–32% reduction in compressive strength and earlier initiation of reinforcement corrosion (third cycle versus sixth cycle). In contrast, 50% replacement resulted in only a slight reduction in compressive strength (about 7% at 90 days and negligible at 28 days), with corrosion initiation observed in the fifth cycle. Moreover, increasing the proportion of recycled aggregates reduced the quality of the passive layer and caused approximately an 80% decrease in linear polarization resistance. Overall, the findings demonstrated that the use of recycled aggregates up to a 50% replacement level has no significant effect on compressive strength and only a minor influence on electrochemical properties compared to the mix containing 100% natural aggregates.

کلیدواژه‌ها [English]

  • Recycled Aggregate
  • Compressive Strength
  • Reinforcement Corrosion
  • Half-Cell
  • Linear Polarization Resistance
  • Potentiodynamic Polarization Resistance

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