Evaluation Of The Criteria For Receiving A Surface -layer Asphalt Mixture According To The Specifications Of The December 2006 Bina Marga Road

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Introduction

Road conditions in Indonesia, especially in North Sumatra, still face many challenges in the form of early damage. One of the main factors causing this damage is the use of asphalt mixtures that do not meet the specified specifications. This is often caused by the implementation of road construction that is not in accordance with the standards. Therefore, it is essential to evaluate the criteria for receiving a surface-layer asphalt mixture on a road construction project. This evaluation must be done with strict quality control to ensure that the road construction work meets the expected standards.

The Importance of Quality Control in Road Construction

Quality control is an important element in the evaluation, where the re-examination is carried out to determine the criteria for receiving a paved mixture using technical indicators, namely the level of density in the percentage. This density level is a comparison between the density obtained in the field and the density generated from the laboratory. The use of statistical methods in this acceptance criteria is very important to ensure that specified specifications can be applied for a long time. By implementing strict quality control, road construction projects can reduce the risk of early damage and ensure the safety of road users.

Statistical Methods in Acceptance Criteria

In testing the criteria for receiving density, two commonly used statistical methods are normal distribution and distribution t. Both of these methods are chosen because each has a different approach in assessing the parameters of planning and testing hypotheses to the average and minimum sample. The normal distribution method is used to determine the average density, while the T distribution method is used to determine the minimum sample.

Normal Distribution Method

The calculation results using the normal distribution method indicate that the hypothesis testing of the average density with n = 6 is µ ≤ µ 0 = 97.33% ≤ 98%. This shows that road construction work must meet the specifications with the criteria for reception RC = (x - ks) ≥ l, so it is expected that the value of x ≥ l or l ≤ 98%. This means that the average density of the asphalt mixture must be at least 98% to meet the specified specifications.

T Distribution Method

Furthermore, Aashto specifications provide a limit that the average quality of density must reach 90%, which is lower compared to the average density of the Bina Marga road specifications in the December 2006 version of 98%. In addition, in testing the minimum sample, the calculation results of the T distribution method show LCL = 92.27% and UCL = 101.8%. This results in an interval of 92.27% ≤ x ≤ 101.8%. Given the number of samples used (n ≤ 30), the T distribution method is the choice in receiving samples. Thus, the value of X for 3 to 4 samples per testing must exceed 92.27% to be considered as an acceptable minimum sample.

Conclusion

In conclusion, the importance of evaluating the criteria for receiving a surface-layer asphalt mixture in accordance with the specified specifications can improve the quality of the road and extend the life of the road itself. Enforcement of strict specifications will help reduce early damage and ensure the safety of road users. By understanding and applying the right statistical analysis, we can ensure that road construction projects in Indonesia, especially in North Sumatra, can meet the expected standards.

Recommendations

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

  • Road construction projects in Indonesia, especially in North Sumatra, must implement strict quality control to ensure that the asphalt mixture meets the specified specifications.
  • The use of statistical methods, such as normal distribution and T distribution, is essential in determining the criteria for receiving a surface-layer asphalt mixture.
  • Road construction work must meet the specifications with the criteria for reception RC = (x - ks) ≥ l, so it is expected that the value of x ≥ l or l ≤ 98%.
  • The average density of the asphalt mixture must be at least 98% to meet the specified specifications.
  • The value of X for 3 to 4 samples per testing must exceed 92.27% to be considered as an acceptable minimum sample.

By implementing these recommendations, road construction projects in Indonesia, especially in North Sumatra, can improve the quality of the road and extend the life of the road itself.

Q: What is the importance of evaluating the criteria for receiving a surface-layer asphalt mixture?

A: The importance of evaluating the criteria for receiving a surface-layer asphalt mixture is to ensure that the road construction work meets the expected standards and to improve the quality of the road and extend the life of the road itself.

Q: What are the main factors causing early damage to roads in Indonesia, especially in North Sumatra?

A: The main factors causing early damage to roads in Indonesia, especially in North Sumatra, are the use of asphalt mixtures that do not meet the specified specifications and the implementation of road construction that is not in accordance with the standards.

Q: What is the role of quality control in road construction?

A: Quality control is an important element in the evaluation, where the re-examination is carried out to determine the criteria for receiving a paved mixture using technical indicators, namely the level of density in the percentage.

Q: What are the two commonly used statistical methods in acceptance criteria?

A: The two commonly used statistical methods in acceptance criteria are normal distribution and distribution t.

Q: What is the normal distribution method used for?

A: The normal distribution method is used to determine the average density.

Q: What is the T distribution method used for?

A: The T distribution method is used to determine the minimum sample.

Q: What is the limit of the average quality of density according to Aashto specifications?

A: The limit of the average quality of density according to Aashto specifications is 90%.

Q: What is the interval of the minimum sample according to the T distribution method?

A: The interval of the minimum sample according to the T distribution method is 92.27% ≤ x ≤ 101.8%.

Q: How many samples per testing must exceed 92.27% to be considered as an acceptable minimum sample?

A: The value of X for 3 to 4 samples per testing must exceed 92.27% to be considered as an acceptable minimum sample.

Q: What are the recommendations for road construction projects in Indonesia, especially in North Sumatra?

A: The recommendations for road construction projects in Indonesia, especially in North Sumatra, are:

  • Implement strict quality control to ensure that the asphalt mixture meets the specified specifications.
  • Use statistical methods, such as normal distribution and T distribution, to determine the criteria for receiving a surface-layer asphalt mixture.
  • Meet the specifications with the criteria for reception RC = (x - ks) ≥ l, so it is expected that the value of x ≥ l or l ≤ 98%.
  • Ensure that the average density of the asphalt mixture is at least 98% to meet the specified specifications.
  • Ensure that the value of X for 3 to 4 samples per testing exceeds 92.27% to be considered as an acceptable minimum sample.

By understanding and applying the right statistical analysis, we can ensure that road construction projects in Indonesia, especially in North Sumatra, can meet the expected standards.