مطالعه مشخصات مکانیکی بتن های حاوی سنگدانه بازیافتی و سبکدانه رس منبسط شده

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، واحد رامسر، دانشگاه آزاد اسلامی، رامسر، ایران.

2 استادیار، گروه مهندسی عمران، واحد رامسر، دانشگاه آزاد اسلامی، رامسر، ایران.

10.22124/jcr.2025.29033.1685

چکیده

در این تحقیق به مطالعه خصوصیات مکانیکی بتن تحت تاثیر حضور مجزا و همزمان سنگدانه های بازیافتی و سبکدانه رس منبسط شده (لیکا) پرداخته شده است. به این منظور سه مخلوط پایه با مقاومت های هدف 40، 70 و 100 مگاپاسکال طراحی شدند. با جایگزینی شن طبیعی در هر مخلوط پایه با شن بازیافتی در نسبت های %50 و %100و لیکا در نسبت های %25 و %50 سه گروه از مخلوطها (در مجموع 18 مخلوط) ساخته شدند. نمونه های آماده شده پس از عمل آوری تا سن 28 روز تحت آزمایش تعیین مقاومت های فشاری،شکافت، برشی و مدول الاستیک قرار گرفتند. نتایج نشان دادند که جایگزینی شن طبیعی با شن بازیافتی و لیکا بصورت مجزا بترتیب می تواند سبب کاهش مقاومت فشاری تا %26.2 و %34.1 نسبت به مخلوط پایه شود. همچنین افت مقاومت فشاری ناشی از استفاده همزمان شن بازیافتی و لیکا بطور قابل توجهی از جایگزینی مجزای شن طبیعی با این مصالح بیشتر می باشد که این مورد در مخلوطهای با مقاومت پایین بیشتر مشاهده می شود. نتایج مقاومت شکافت ، مقاومت برشی و مدول الاستیک در مخلوطهای مختلف روندی مشابه با مقاومت فشاری را نشان داد بطوریکه با افزایش جایگزینی شن طبیعی با شن بازیافتی و لیکا مقاومت شکافت، مقاومت برشی و مدول الاستیک بطور محسوسی کاهش می یابند اگرچه اثر کاهنده استفاده همزمان شن بازیافتی و لیکا کم می باشد. همچنین برای مخلوطهای مختلف همبستگی بالایی میان مقاومت های شکافت، برشی و مدول الاستیک با جذر مقاومت فشاری وجود دارد که روابطی برای آنها ارائه شدند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

a study on the mechanical properties of concrete containing recycled aggregate and lightweight expanded clay aggregate

نویسندگان [English]

  • Seyed Ali Hashemi 1
  • Iman Sadrinejad 2
1 Department of Civil Engineering, Ram.C., Islamic Azad University, Ramsar, Iran.
2 Department of Civil Engineering, Ram.C., Islamic Azad University, Ramsar, Iran.
چکیده [English]

This study studied both the separate and combined effects of lightweight expanded clay aggregate (LECA) and recycled aggregate on the mechanical properties of concrete.

For this purpose, three basic mixtures with target strengths of 40, 70 and 100 MPa were designed.

At each base mixture, natural coarse aggregate was substituted with recycled coarse aggregate in proportions of 50% and 100% and LECA in proportions of 25% and 50% to develop three groups of mixtures, totaling 18 mixtures. The prepared samples were tested to determine compressive, splitting, shear strengths and elastic modulus after curing for 28 days. The results showed that replacing natural coarse aggregate with recycled coarse aggregate and LECA separately reduced the compressive strength by 26.2% and 34.1% compared to the base mix, respectively. Also, the decrease in compressive strength resulting from the simultaneous use of recycled coarse aggregate and LECA was significantly greater than the separate replacement of natural coarse aggregate with these materials, which was more observed in low-strength mixtures. the splitting strength, shear strength, and elastic modulus results in various mixtures showed a similar trend to compressive strength, meaning that these characteristics significantly decrease as natural coarse aggregate was replaced by recycled coarse aggregate and LECA, although the reducing effect of simultaneous use of recycled coarse aggregate and LECA was small. Furthermore, relationships were established between the square root of the compressive strength and the splitting strength, shear strength, and elastic modulus for different mixtures.

کلیدواژه‌ها [English]

  • concrete
  • recycled aggregate
  • Lightweight expanded clay aggregate
  • mechanical properties

مراجع

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