بررسی رفتار ترکیب بتن بازیافتی و خودتراکم در ساخت روسازی راه به کمک آزمایش التراسونیک و مقایسه آن با سایر روشها

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی عمران، موسسه آموزش عالی پویش، قم، ایران

2 گروه مهندسی عمران، واحد صفادشت، دانشگاه آزاد اسلامی، تهران، ایران

چکیده

امروزه از بتن بازیافتی به دلیل هزینه پایین و نیز کمک به محیط زیست، برای ساخت بسیاری از پروژه های عمرانی مورد استفاده قرار می گیرد. ضمناً، بتن خود تراکم به دلیل عدم نیاز به ویبره و کمترین احتمال ایجاد حفره های بزرگ و خلل و فرج، از اهمیت و کاربرد بالایی برخوردار است. در این مقاله با ترکیب این دو نوع بتن خواص آن مورد بررسی قرار گرفته شده استا. برای بدست آوردن مقاومت فشاری بتن می توان از روش های غیر مخرب که می تواند بسیار ساده تر، سریعتر و بدون خرابی است، استفاده شود با این حال بایستی بین نتایج آزمایش مخرب و غیر مخرب همخوانی وجود داشته باشد تا قابل قبول باشند. در این مقاله رفتار ترکیب بتن بازیافتی و خودتراکم مورد استفاده در روسازی بتنی جاده ها مورد بررسی قرار گرفته شده است. برای این کار از روش کرگیری و آزمایش التراسونیک استفاده شده و مقایسه بین نتایج صورت گرفته است. به صورت میانگین مقاومت فشاری 7 روزه در عیار سیمان 250 کیلوگرم بر متر مکعب برابر با 20.1 مگاپاسکال و در عیار سیمان 400 کیلوگرم بر متر مکعب برابر با 30.8 مگاپاسکال ثبت شده است که رشد 52% را داشته است. همچنین در کلیه آزمایش های صورت گرفته مقدار مقاومت فشاری کسب شده در آزمایش کرگیری بالاتر از سایر نتایج بوده است. به صورت میانگین، مقدار مقاومت فشاری بدست آمده در روش کرگیری نسبت به روش آزمایش درجا و آزمایش آلتراسونیک به ترتیب 8% و 14%  بیشتر به دست آمده است. به صورت میانگین مقاومت فشاری 28 روزه در عیار سیمان 250 کیلوگرم بر متر مکعب برابر با 25.2 مگاپاسکال و در عیار سیمان 400 کیلوگرم بر متر مکعب برابر با 38.9  مگاپاسکال ثبت شده است که رشد 54% را داشته است. در نهایت این نتیجه بدست آمده است که نتایج آزمایش کر گیری و التراسونیک در تعیین مقاومت فشاری بتن می توان بین 7 تا 17 درصد اختلاف داشته باشد و نتایج حاصل از آزمایش التراسونیک مقادیر کمتری را نشان می دهد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of the behavior of recycled concrete and self-compacting concrete in road pavement construction using ultrasonic test and compare it with other methods

نویسندگان [English]

  • Masoud Golshani 1
  • Kambiz Takin 2
  • Saeid Sabouri 2
1 Assistant Professor, Department of Civil Engineering, Pooyesh Institute of Higher Education, Qom, Iran
2 Department of Civil Engineering, Safadasht branch, Islamic Azad University, Tehran, Iran
چکیده [English]

Nowadays, recycled concrete is used for the construction of many construction projects due to its low cost and environmental protection. In addition, self-compacting concrete is very important and useful due to the lack of vibration and the least possibility of creating large holes and voids. In this article, by combining these two types of concrete, its properties have been investigated. To obtain the compressive strength of concrete, non-destructive methods can be used, which can be much simpler, faster, and without damage, however, there must be agreement between the destructive and non-destructive test results to be acceptable. In this article, the behavior of recycled and self-compacting concrete used in road concrete pavements has been investigated. For this purpose, the method of grinding and ultrasonic testing has been used and a comparison has been made between the results. The average compressive strength of 7 days in cement grade of 250 kg/m3 is equal to 20.1 MPa and in cement grade of 400 kg/m3 is equal to 30.8 MPa, which has a growth of 52%. Also, in all the tests, the compressive strength obtained in the core sampling test was higher than the other results. On average, the value of compressive strength obtained in the core sampling method is 8% and 14% higher than the in-situ test method and ultrasonic test, respectively. The average compressive strength of 28 days in cement grade of 250 kg/m3 is equal to 25.2 MPa and in cement grade of 400 kg/m3 it is equal to 38.9 MPa, which has increased by 54%. Finally, it has been concluded that the results of sanding and ultrasonic testing in determining the compressive strength of concrete can have a difference between 7 and 17%, and usually the results of ultrasonic testing show lower values.

کلیدواژه‌ها [English]

  • Concrete
  • compressive strength
  • in situ test
  • ultrasonic test
  • corrugation test

مراجع

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نشریه مهندسی عمران امیرکبیر
دوره 55، شماره 10
دی 1402
صفحه 2025-2042

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