جایگزینی سیمان با پودر نخالههای بتنی در بتن‌های حاوی سنگدانههای بازیافتی (بررسی خصوصیات مکانیکی، اقتصادی و محیط زیستی)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناس ارشد مهندسی عمران، دانشگاه لرستان، خرم آباد، ایران

2 گروه عمران، دانشکده فنی و مهندسی، دانشگاه لرستان

3 دانشجوی دکتری مهندسی عمران، دانشگاه صنعتی نوشیروانی، بابل، ایران

چکیده

در این تحقیق خصوصیات روانی، مکانیکی (مقاومت فشاری، کششی و خمشی)، اقتصادی و محیط زیستی نمونه‌های ساخته شده از 28 طرح اختلاط مختلف بررسی شد. در این طرح‌های اختلاط 0، 15 و 30 درصد سیمان پرتلند معمولی (OPC) با پودر بازیافتی از نخاله‌های بتنی (RCP) و میکروسیلیس (SF) و 0، 50 و 100 درصد سنگدانه‌های طبیعی (NA) با سنگدانه‌های بازیافتی از نخاله‌های بتنی (RCA) جایگزین شدند. نخاله‌های بتنی با مقاومت‌های اولیه 20، 40 و 80 مگاپاسکال در تهیه RCA مورد استفاده قرار گرفت. نتایج نشان داد که استفاده از RCA بعنوان جایگزین NA و RCP بعنوان جایگزین OPC بر خصوصیات روانی و مکانیکی تأثیر منفی و بر خصوصیات محیط زیستی و اقتصادی تأثیر مثبت دارد. بررسی نتایج نشان داد که تأثیر منفی ناشی از RCA با افزایش مقاومت اولیه نخاله‌های بتنی مورد استفاه در تولید آن و تأثیر منفی ناشی از RCP با استفاده از SF برطرف می‌گردد. در نهایت، با انجام بهینه‌یابی چند متغیره بین طرح‌های اختلاط این نتیجه حاصل شد که جایگزینی50 درصد از NA با RCA با مقاومت اولیه 40 و 80 مگاپاسکال و جایگزینی 30 درصد از OPC با RCP و SF از لحاظ خصوصیات روانی، مکانیکی، اقتصادی و محیط زیستی توجیه دارد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Replacement of OPC with RCP in Concrete Containing RCA (Investigation of Mechanical, Economic and Environmental Characteristics)

نویسندگان [English]

  • Mahdi Abdali 1
  • Fereydoon Omidinasab 2
  • Amirhosein Sahraei Moghadam 3
1 M.Sc., Faculty of Engineering, Lorestan University, Khorramabad, Iran
2 Civil, engineering, lorestan university, khorramabad, iran
3 Ph.D student, Faculty of Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran
چکیده [English]

This paper presents the results of an experimental study on the properties of environmentally friendly concrete. In the making of specimens, 0%, 15%, and 30% of ordinary Portland cement (OPC) were replaced by recycled concrete powder (RCP) and silica fume (SF). In addition, 0%, 50%, and 100% of natural aggregates (NA) were replaced by recycled concrete aggregates (RCA). In the production of RCA, 3 types of concrete waste with an initial strength of 20, 40, and 80 MPa were used. In this study, rheological, mechanical (compressive, splitting tensile and flexural strengths), economic and environmental (GWP) properties of 28 mix designs were investigated. The results showed that the use of RCA and RCP has a negative effect on rheological and mechanical properties. However, the results showed that the use of RCA and RCP has a positive effect on environmental and economic properties. Moreover, the results indicated that the negative effect of RCA can be prevented by increasing the initial strength of RCA, and the negative effect of RCP can be prevented by using SF. Finally, by optimization of mixing designs, it was concluded that it is justified to use 50% of RCA with an initial strength of 40 and 80 MPa and 30% of RCP and SF, in terms of rheological, mechanical, economic, and environmental properties.

کلیدواژه‌ها [English]

  • Recycled aggregate
  • Recycled powder
  • Mechanical properties
  • Environment
  • Optimization

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نشریه مهندسی عمران امیرکبیر
دوره 53، شماره 1
فروردین 1400
صفحه 107-126

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