مشخصات مقاله:
عنوان فارسی مقاله:
رفتار تنش-کرنش بتن محصور شده FRP حاوی توده های بتن بازیافتی
عنوان انگلیسی مقاله:
Stress-strain behavior of FRP-confined concrete containing recycled concrete lumps
سال انتشار مقاله:
2021
کلمات کلیدی مقاله:
پلیمر تقویت شده با الیاف (FRP)، توده های بتونی بازیافتی (RCL)، بتن مرکب، لوله های FRP، حبس، رفتار فشار روحی
مناسب برای رشته های دانشگاهی زیر:
مهندسی عمران
مناسب برای گرایش های دانشگاهی زیر:
سازه، مدیریت ساخت
وضعیت مقاله انگلیسی و ترجمه:
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فهرست مطالب:
Abstract
Keywords
1. Introduction
2. Experimental program
2.1. Recycled concrete lumps (RCLs)
2.2. Specimen details
2.3. FRP tubes
2.4. Fabrication of column specimens
2.5. Test set-up and instrumentation
3. Test results and discussions
3.1. General observations
3.2. Stress-strain curves
3.3. Axial strain-lateral strain curves
4. Theoretical analysis
4.1. Jiang and Teng’s model [25]
4.2. Comparisons and discussions
5. Conclusions
CRediT authorship contribution statement
Declaration of Competing Interest
Acknowledgements
References
قسمتی از مقاله انگلیسی:
abstract
A novel method to recycle concrete is to crush demolition concrete into large pieces and then to directly mix the resulting recycled concrete lumps (RCLs) with fresh concrete to produce a new kind of recycled concrete referred to as ‘‘compound concrete”. This method avoids the complexity of recycling concrete into aggregates and enables the achievement of a higher recycling ratio and a lower recycling cost. However, due to the large sizes of RCLs and the weak interfaces between fresh concrete and RCLs, compound concrete is much more heterogeneous than normal concrete. A new technique has recently been explored to improve the properties of such compound concrete, in which the compound concrete is provided with a substantial amount of confinement from an external fiber-reinforced polymer (FRP) confining tube. This paper presents the results of an experimental program of axial compression tests on compound concrete-filled FRP tubular columns in which the FRP tubes were prefabricated using the wet lay-up method with fibers only in the hoop direction. The tubes had a negligible axial stiffness, which allows the stress-strain behavior of FRP-confined compound concrete to be clearly revealed. The test results show that, when a significant level of FRP confinement is provided, the behavior of FRPconfined compound concrete is similar to that of FRP-confined normal concrete with a strength equal to that of the fresh concrete. An existing stress-strain model previously developed for FRP-confined normal concrete is evaluated in the paper using the test results of FRP-confined compound concrete.