Benkelman beam deflection method is used for the design ofa)Rigid over...
Benkelman Beam Deflection Method for the Design of Flexible Overlay on Flexible Pavement
The Benkelman beam deflection method is a widely used technique in civil engineering for the design of flexible overlay on flexible pavement. It is an effective tool that helps engineers determine the structural condition of pavements and make informed decisions regarding the need for rehabilitation or overlay.
1. What is the Benkelman Beam Deflection Method?
The Benkelman beam deflection method is a non-destructive testing technique used to measure the deflection of a pavement under a known load. It involves the use of a specially designed beam, known as the Benkelman beam, which is placed on the pavement surface and loaded with a known force. The resulting deflection is measured and used to assess the structural condition of the pavement.
2. Why is the Benkelman Beam Deflection Method used for Flexible Overlay on Flexible Pavement?
The Benkelman beam deflection method is particularly suitable for the design of flexible overlay on flexible pavement due to the following reasons:
- Flexibility Assessment: The method allows engineers to evaluate the flexibility and structural capacity of the existing pavement. This is crucial when considering the addition of a flexible overlay, as it ensures that the existing pavement can accommodate the load transfer and stresses caused by the new overlay.
- Deflection Measurements: The deflection measurements obtained using the Benkelman beam help engineers estimate the structural integrity of the pavement. By comparing the deflection values with predetermined threshold values, engineers can determine whether the pavement requires rehabilitation or overlay.
- Cost-Effectiveness: The Benkelman beam deflection method is a cost-effective technique for evaluating the structural condition of pavements. It provides valuable information without the need for extensive and expensive coring or drilling.
- Non-Destructive Testing: The method is non-destructive, meaning it does not cause any damage to the pavement. This is particularly important when assessing the condition of existing pavements, as it allows engineers to gather data without compromising the integrity of the pavement.
Conclusion
In conclusion, the Benkelman beam deflection method is used for the design of flexible overlay on flexible pavement. It provides engineers with valuable information regarding the structural condition and flexibility of the existing pavement, allowing them to make informed decisions about the need for rehabilitation or overlay. The method is cost-effective, non-destructive, and widely used in civil engineering practices for pavement evaluation and design.
Benkelman beam deflection method is used for the design ofa)Rigid over...
Benkelman Beam deflection method:
The Benkelman beam method is thus widely used for evaluation of the structural capacity of existing flexible pavements and also for estimation and design of flexible overlays for the strengthening of any weak pavement for highways. The Benkelman beam measures the deflection of a flexible pavement under moving wheel load.
Overlay thickness is given by,
![](https://edurev.gumlet.io/ApplicationImages/Temp/67a33d94-4844-44fc-b882-589352d02cd8_lg.jpg)
Where, D
c = Corrected rebound deflection and D
a = Allowable deflection
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