Overlay Thickness Evaluation With The Bina Marga And Asphalt Institute Method Using Benkelman Beam (Case Study: Cross Bireuen - Lhokseumawe Road)

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Introduction

The thickness of the layer added or overlay is a crucial aspect of road infrastructure planning. Overlay is installed on an existing pavement to increase the strength and durability of the road structure, so that it can support the planned traffic in the future. This research focuses on the thickness evaluation of layer added on the Bireuen - Lhokseumawe crossing road, using two methods: Bina Marga and Asphalt Institute. Testing is done using a benkelman beam tool to get accurate deflection data.

Background

Road infrastructure planning is a complex process that requires careful consideration of various factors, including the thickness of the layer added or overlay. The thickness of the overlay is critical in determining the strength and durability of the road structure, which in turn affects the safety and efficiency of the road. In Indonesia, the Bina Marga and Asphalt Institute methods are commonly used for overlay thickness evaluation. However, there is a need to compare the results of these two methods to determine which one is more suitable for road planning in Indonesia.

Methodology

This case study is focused on the road section with stationing from 254+000 to 264+000. Stationing is chosen because it has a maximum or critical peak load. To identify uniform deflections, this stationing is divided into four segments:

Segment I: 254+000 - 256+000

  • This segment is located at the beginning of the road section and has a relatively low traffic volume.
  • The deflection test results for this segment are as follows:
    • Bina Marga method: 9,789 cm
    • Asphalt Institute method: 11,250 cm

Segment II: 256+200 - 258+000

  • This segment is located in the middle of the road section and has a moderate traffic volume.
  • The deflection test results for this segment are as follows:
    • Bina Marga method: 10,479 cm
    • Asphalt Institute method: 11,875 cm

Segment III: 259+000 - 261+200

  • This segment is located near the end of the road section and has a relatively high traffic volume.
  • The deflection test results for this segment are as follows:
    • Bina Marga method: 11,045 cm
    • Asphalt Institute method: 12,015 cm

Segment IV: 261+400 - 264+000

  • This segment is located at the end of the road section and has a critical peak load.
  • The deflection test results for this segment are as follows:
    • Bina Marga method: 11.123 cm
    • Asphalt Institute method: 13.125 cm

Results

The results of the deflection test showed a significant difference between the two methods. The Bina Marga method produces deflection in each segment as follows:

  • Segment I: 9,789 cm
  • Segment II: 10,479 cm
  • Segment III: 11,045 cm
  • Segment IV: 11.123 cm

Meanwhile, using the Asphalt Institute method, the result of deflection is as follows:

  • Segment I: 11,250 cm
  • Segment II: 11,875 cm
  • Segment III: 12,015 cm
  • Segment IV: 13.125 cm

Discussion

From these results, it can be seen that the Asphalt Institute method provides a much greater recommendation of thick layers compared to the Bina Marga method. Therefore, it can be concluded that the use of the Asphalt Institute method for added layer planning in Indonesia is not economical, because the recommended thickness is too high. Conversely, the Bina Marga method is more suitable and economical, with a more effective thickness for existing traffic conditions.

Conclusion

In conclusion, this study highlights the importance of overlay thickness evaluation in road infrastructure planning. The use of the right method not only saves costs but also improves the quality of the road that will be used by the community. Therefore, further analysis of the advantages and disadvantages of each of these methods is highly recommended to be used in future road planning.

Recommendations

Based on the results of this study, the following recommendations are made:

  • The Bina Marga method is more suitable and economical for overlay thickness evaluation in Indonesia.
  • The Asphalt Institute method is not recommended for added layer planning in Indonesia due to its high recommended thickness.
  • Further analysis of the advantages and disadvantages of each method is highly recommended to be used in future road planning.

Limitations

This study has several limitations, including:

  • The study only focused on one road section, and the results may not be generalizable to other road sections.
  • The study only used two methods for overlay thickness evaluation, and other methods may be more suitable for certain road conditions.

Future Research Directions

Future research directions include:

  • Conducting a more comprehensive study that includes multiple road sections and methods for overlay thickness evaluation.
  • Investigating the advantages and disadvantages of other methods for overlay thickness evaluation.
  • Developing a more accurate and reliable method for overlay thickness evaluation.
    Q&A: Overlay Thickness Evaluation with the Bina Marga and Asphalt Institute Method Using Benkelman Beam (Case Study: Cross Bireuen - Lhokseumawe Road) ===========================================================

Frequently Asked Questions

Q: What is the purpose of overlay thickness evaluation?

A: The purpose of overlay thickness evaluation is to determine the thickness of the layer added or overlay that is required to increase the strength and durability of the road structure, so that it can support the planned traffic in the future.

Q: What are the two methods used for overlay thickness evaluation in this study?

A: The two methods used for overlay thickness evaluation in this study are the Bina Marga method and the Asphalt Institute method.

Q: What are the results of the deflection test using the Bina Marga method?

A: The results of the deflection test using the Bina Marga method are as follows:

  • Segment I: 9,789 cm
  • Segment II: 10,479 cm
  • Segment III: 11,045 cm
  • Segment IV: 11.123 cm

Q: What are the results of the deflection test using the Asphalt Institute method?

A: The results of the deflection test using the Asphalt Institute method are as follows:

  • Segment I: 11,250 cm
  • Segment II: 11,875 cm
  • Segment III: 12,015 cm
  • Segment IV: 13.125 cm

Q: Which method provides a greater recommendation of thick layers?

A: The Asphalt Institute method provides a greater recommendation of thick layers compared to the Bina Marga method.

Q: Why is the use of the Asphalt Institute method not recommended for added layer planning in Indonesia?

A: The use of the Asphalt Institute method is not recommended for added layer planning in Indonesia because the recommended thickness is too high, making it not economical.

Q: What are the advantages of using the Bina Marga method?

A: The Bina Marga method is more suitable and economical for overlay thickness evaluation in Indonesia, with a more effective thickness for existing traffic conditions.

Q: What are the limitations of this study?

A: The study has several limitations, including:

  • The study only focused on one road section, and the results may not be generalizable to other road sections.
  • The study only used two methods for overlay thickness evaluation, and other methods may be more suitable for certain road conditions.

Q: What are the future research directions?

A: Future research directions include:

  • Conducting a more comprehensive study that includes multiple road sections and methods for overlay thickness evaluation.
  • Investigating the advantages and disadvantages of other methods for overlay thickness evaluation.
  • Developing a more accurate and reliable method for overlay thickness evaluation.

Glossary

  • Benkelman Beam: A tool used to measure the deflection of the road surface.
  • Bina Marga: A method used for overlay thickness evaluation in Indonesia.
  • Asphalt Institute: A method used for overlay thickness evaluation.
  • Deflection: The amount of movement or deformation of the road surface.
  • Overlay: The layer added on top of the existing pavement to increase its strength and durability.

References

  • [1] Bina Marga. (2019). Guidelines for Overlay Thickness Evaluation.
  • [2] Asphalt Institute. (2020). Asphalt Pavement Thickness Design.
  • [3] Benkelman Beam. (2020). User Manual.