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

Document Type : Research Article

Authors

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

Abstract

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.

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Main Subjects

References

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Amirkabir Journal of Civil Engineering
Volume 55, Issue 10
January 2024
Pages 2025-2042

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