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Structural Evaluation of Flexible Pavement with 2017 Road Pavement Design Manual (MDP) and 2017 Austroads Method (Case Study: Tanah Runtuh – Tawaeli National Road Section)

Abstract

National roads in urban and rural areas use flexible pavement in general. If damage occurs on the pavement, structural road maintenance can be analyzed. The most commonly used evaluation for structural pavements is conducting a deflection survey using the Falling Weight Deflectometer (FWD) tool, where the results from the deflection evaluation can be used to determine the overlay. This research aims to conduct a structural evaluation of the Tanah Runtuh – Tawaeli National Road section and determine the required overlay thickness using the 2017 MDP and Austroads method. The road segment is divided into STA 10+000 to 12+656 and STA 14+400 to 18+700. The required overlay thickness using the 2017 MDP for average pavement temperatures of 47°C, 42°C, 41°C, 38°C, and 35°C is 80 mm for both segments. The required overlay thickness using Austroads method is 114mm and 98mm for a temperature of 47°C, 105mm for a temperature of 42°C, 97mm for a temperature of 41°C, 85mm for a temperature of 38°C, and 83mm for a temperature of 35°C. The analysis results using the 2017 MDP is not affected by the pavement temperature, meanwhile the overlay thickness from the Austroads method show that the pavement temperature affects the required overlay thickness. Key words: Flexible pavement, deflection, FWD, overlay thickness, MDP 2017, austroads. Abstract Jalan nasional di perkotaan maupun luar kota masih umum menggunakan perkerasan lentur. Apabila terjadi kerusakan pada perkerasan dapat dilakukan pemelihaaran jalan secara struktural pada perkerasan tersebut. Evaluasi yang paling umum digunakan untuk struktural perkerasan adalah dengan melakukan survey lendutan dengan menggunakan alat Falling Weight Deflectometer (FWD) yang mana hasil dari evaluasi lendutan dapat digunakan untuk menentukan lapis tambah (overlay). Penelitian ini bertujuan untuk melakukan evaluasi struktural pada ruas jalan Nasional Tanah Runtuh – Tawaeli dan menentukan tebal lapis tambah menggunakan metoda Manual Desain Perkerasan Jalan 2017 dan Austroads. Ruas dibagi menjadi 2 (dua) segmen yaitu segmen STA 10+000 s/d 12+656 dan STA 14+400 s/d 18+700. Kebutuhan tebal lapis tambah menggunakan metoda MDP 2017 untuk nilai temperatur rata-rata perkerasan 47°C, 42°C, 41°C, 38°C, dan 35°C adalah 80 mm untuk kedua segmen. Kebutuhan tebal lapis tambah dengan menggunakan metoda Austroads adalah 114 mm dan 98 mm untuk temperatur 47°C, 105 mm untuk temperatur 42°C, 97 mm untuk temperatur 41°C, 85 mm untuk temperatur 38°C, dan 83 mm untuk temperatur 35°C. Hasil analisis dengan menggunakan metoda MDP 2017 tidak dipengaruhi oleh temperatur perkerasan, sementara tebal overlay yang dihasilkan dari metoda Austroads menunjukkan bahwa temperatur perkerasan mempengaruhi tebal overlay yang dibutuhkan. Key words: Flexible pavement, deflection, FWD, overlay thickness, MDP 2017, austroads.

Keywords

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Tabel 4. Analysis of ESA5 traffic load with 2017 MDP method

Vehicle
Group
ADT
2019
DDDLRVDF5ESA5
Group 236920,50,812,432
Group 32640,50,812,432
Group 49420,50,812,432
Group 5a100,50,812,432
Group 5b100,50,812,4321,323596,11
Group 6a500,50,812,4320,436509,14
Group 6b4930,50,812,4321,21074738
Group 7a580,50,812,43235,63738557
Group 7b10,50,812,432
Group 7c350,50,812,43232,82083718
Total6.957.118

4.1 Design traffic load calculation with MDP 2017

In the 2017 MDP method, the calculation parameters used are as follows.

  • a. ADT (average daily traffic)
  • b. VDF (vehicle damage factor)
  • c. DD (directional distribution)
  • d. DL (lane distribution)
  • e. i (traffic growth)
  • f. R (traffic growth multiplier)

The design traffic load in 2017 MDP is called CESA (Cummulative Equivalent Standard Axle), where later the CESA4 value will be obtained which is used for damage due to permanent deformation, and CESA5 will be used for damage due to fatigue. The calculation of ESA4 and ESA5 can be seen in Table 3 and Table 4.

4.2 Design traffic load calculation with austroads 2017 method

The parameters used in calculating the design traffic load with Austroads method are as follows.

  • a. AADT (Annual Average Daily Traffic)
  • b. DF (direction factor) or direction distribution factor
  • c. %HV (average percentage of heavy vehicle)
  • d. LDF (lane distribution factor)
  • e. CGF (cumulative growth factor)

Traffic load in Austroads is usually called DESA (Design Equivalent Standard Axle) where from the results of this DESA, 2 parameters based on damage type will be obtained. The DESA value will be multiplied by the SAR/ESA multipliers, which are DSAR5 (Design number of Standard Axle Repetition for Fatigue of Asphalt) and DSAR7 (Design number of Standard Axle Repetition for Rutting and Permanent Deformation).

4.3 Comparison of traffic load calculation with the 2017 MDP method and austroads method

In the calculation of traffic load both with 2017 MDP method and Austroads method, the 2019 traffic

Table 5. Analysis of traffic load calculation with austroads method

Vehicle GroupAADTLDFDFCGFDESA
Group 5b100.80.512.43218150.853
Group 6a508.00.512.43291272.861
Group 6b4938.00.512.432895614.949
Group 7a588.00.512.432105015.650
Group 7b18.00.512.4322333.681
Group 7c358.00.512.43263527.986
Total1.175.916

Table 6. SAR/ESA value

No.Damage TypeDamage
Index
SAR/ESA
Value
1Fatigue AsphaltSAR5/ESA2.1
2Rutting & Permanent DeformationSAR7/ESA9.5

Table 7. Recapitulation of design traffic load with austroads method

No.DESADSAR5DSAR7
11.175.9162.410.62811.053.610

counting results data on Tanah Runtuh – Tawaeli National Road is used. Due to the limited data obtained, the traffic growth value used is the value set by the 2017 Pavement Design Manual, which is 4.75%. In the analysis of traffic load calculation using the 2017 MDP method, it is necessary to have a VDF (Vehicle Damage Factor) value where the VDF data used is the value issued by the 2017 Pavement Design Manual through the Pavement Design Manual Supplement for the Gorontalo, Central Sulawesi, and North Sulawesi areas. After that, for the calculation using the Austroads method, SAR/ESA value is needed to get the DSAR5 and DSAR7 values.

From the data, the traffic load value was obtained. Based on the 2017 MDP method the value of the traffic load is expressed in CESA (Cummulative Equivalent Standard Axle), where there are 2 CESA values: CESA4 of 4.372.152 and CESA5 of 6.957.118. The CESA4 is used for damage due to permanent deformation and CESA5 is used for damage due to fatigue cracking or fatigue. Meanwhile, for the Austroads method, the traffic load is expressed in DESA (Design Equivalent Standard Axle) where the DESA value obtained is 1.175.916 which is then from this one DESA value, DSAR5 (Design number of Standard Axle Repetition for Fatigue of Asphalt) of 2.410.628 and DSAR7 (Design number of Standard Repetition for Rutting and Permanent Deformation) of 11.053.610 would be obtained.

4.4 Deflection analysis with 2017 MDP method

Similar to the Austroads method, the deflection analysis with the 2017 MDP method also uses 5

different temperature values. Deflection analysis with 2017 MDP method will generate a representative deflection of D<sub>0</sub> for damage based on permanent deformation and \(D_0 - D_{200}\) for damage based on cracking due to fatigue. The segmentation is divided into 2: segment 1: 10+000 to 14+202 and segment 2:

2

Figure 4. D<sub>0</sub> deflection segmentation with AMPT 47°C

4

Figure 5. D0 – D200 deflection segmentation with AMPT 47°C

14+400+18+700. The result can be seen in Figure 4 for \(D_0\) deflection and Figure 5 for lendutan \(D_0 - D_{200}\)deflection.

4.5 Deflection analysis with austroads method

Structural evaluation of the flexible pavement for the Tanah Runtuh - Tawaeli National Road section would be carried out using deflection from the results of the FWD test and would use 5 (five) different average pavement temperature values, where the first is the temperature value from the WMAP analysis on the Austroads method, then the temperature value set by the 2017 MDP, which is 42°C for coastal areas, 41°C as the average temperature in Indonesia, and 38°C for mountainous areas and 35°C as the lowest limit for pavement temperatures.

In the deflection analysis, it will be found that there is a segmentation division, based on the type of representative Deflection and Curvature. Figure 6 is segmentation for representative Deflection and Figure 7 is segmentation for representative Curvature.

To obtain the Characteristic Deflection (CD) value, standardization is needed, which is shown in Table 10. Meanwhile the standardization factor for CC is shown in Figure 8.

Based on Table 10, standardization factor for Deflection is 1.1 because the deflection test tool used is an FWD tool.

Table 8. Representative D<sub>0</sub> deflection with AMPT on different temperature

AMPTSegmentAverage D0Coeff of VariationRepresentative D0Representative D0
AWIFISegmentμm%μmmm
47°C1570.02328.332835.6880.836
47 02520.06528.381762.8640.763
42°C1523.4524729.8080.73
42 02476.01224661.7020.662
38°C1519.35324724.0970.724
30 C2470.72324654.350.654
35°C1506.89828743.1430.743
2458.03928666.4810.666

Tabel 9. Representative D<sub>0</sub> - D<sub>200</sub> deflection with AMPT on different temperature

AMPTSegmentAverage D0Coeff of VariationRepresentative D0Representative D0
AWIFISegmentμm%μmmm
47°C1189.37728.098189.3770.189
47 C2198.05918.798198.0590.198
42°C1178.85628178.8560.179
42 C2162.29819162.2980.162
38°C1163.46928163.4690.163
30 C2145.85818145.8580.146
35°C1159.45527.326159.4550.159
35 C2143.03716.065143.0370.143
1

Figure 6. Segmentation for deflection

3

Figure 7. Segmentation for curvature

Table 10. Standardization factor for deflection (Austroads, 2019)

Deflection Measurement DeviceDeflection Standardization Factor
Deflectograph, 80 kN single axle with dual tyres1.2
TSD, 50 kN dual tyres1.2
Falling Weight Deflectometer, 40 kN load1.1

Table 11. CD and CC values based on standardization factor for WMAPT with different temperature

DrepresentativeCharacteristic DeflectionCharacteristic Curvature
WMAPTSegmentDeflectionCurvatureCharacteristic DeflectionCharacteristic Curvature
mımmmmm
47°C10.5470.2050.6030.205
47 C20.4690.1840.5170.184
400010.5630.2370.6190.237
42°C20.5070.1980.5580.198
440010.5570.2250.6140.225
41°C20.5060.1910.5570.192
000010.4990.2150.550.216
38°C20.490.1920.5390.192
25°010.4810.2160.530.217
35°C20.4730.1910.5210.192
9

Figure 8. Standardization factor for curvature (Austroads, 2008)

Next, based on Figure 8, the standardization factor for curvature using the FWD tool is 1.

The result of deflection calculation using the Austroads method is used to obtain the Characteristic Deflection (CD) value to obtain the overlay thickness based on damage due to permanent deformation, and to obtain the Characteristic Curvature (CC) value to obtain the overlay thickness based on cracking due to fatigue.

4.6 Comparison of deflection analysis using 2017 MDP method and austroads method

The deflection analysis with both methods is the same using 5 (five) different values of average pavement temperature. The following is a recapitulation of the results of the deflection calculation using the two methods.

Based on Table 12 and Tabel 13 there is a decrease in representative deflection value along with decreasing temperature value which is the reference in the analysis of the deflection calculation. In addition, the deflection value would be used in the overlay thickness analysis where the representative \(D_0\) deflection and CD would be used for the overlay thickness based on permanent deformation, while representative \(D_{-0} - D_{200}\) deflection and CC would be used for overlay thickness based on fatigue due to cracking.

4.7 Overlay thickness analysis with 2017 MDP method

Overlay thickness analysis with 2017 method used the Falling Weight Deflectometer (FWD) deflection approach. Similar to the Austroads method, the 2017 MDP also takes into account the damage due to fatigue

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values. For all overlay thickness based on permanent deformation, there is no need for overlay.

5. Discussions

After analyzing with Austroads method and 2017 MDP Method, each of these methods can be discussed. The discussion for both methods is as follows.

  • 1. The discussion for 2017 MDP method is as follows.
    • a. The Vehicle Damage Factor used has taken into account the load due to permanent deformation and cracking due to fatigue, so that when traffic load analysis is conducted, the value has been divided according to the damage that had occurred
    • b. The deflection analysis used may use the approach with FWD test results.
    • c. In deflection analysis, the D<sub>0</sub> value needs to be adjusted to the Benkelman Beam deflection so that an advanced analysis can be conducted.
    • d. Overlay thickness analysis was conducted with the design chart method so that it could be directly used easily but there could also be inaccuracies.
    • e. The overlay thickness obtained has a consistent value despite using different average pavement temperature (AMPT) values because the resulting deflection values did not have a much wide range.
  • 2. The discussion for the 2017 Austroads Method is as
    • a. In the traffic load analysis, the Austroads method has taken into account the load due to damage due to permanent deformation and fatigue.
    • b. For the deflection analysis, an approach with the FWD (Falling Weight Deflectometer) test may be conducted to obtain the required overlay thickness value.
    • c. In the deflection analysis for Characteristic Deflection, the design deflection is only affected by the DSAR7 value without being affected with the temperature value, so all design deflections obtained are the same.
    • d. The overlay thickness analysis used chart analysis to get the required overlay thickness, so that it is easier, but it can also be less accurate.
    • e. The overlay thickness obtained varied for every temperature based on fatigue.
    • f. From the analysis results, it could be seen that the different WMAPT values can produce different overlay thickness values, where a difference of one temperature value can change the resulting overlay thickness.

From the results of the analysis above, the 2017 Pavement Design Manual (MDP) and Austroads methods each have their own advantages and disadvantages, so that these two methods can be used as a reference in calculating structural evaluation and determining the value of overlay thickness for Indonesia.

6. Conclusions

From the results of the research that has been conducted for the Tanah Runtuh - Tawaeli National Road section using the Austroads method and the 2017 Pavement Design Manual, the following conclusions can be drawn:

  • 1. In the deflection analysis using the Austroads method, two types of deflection characteristics were produced according to their respective damage, namely Characteristic Deflection for damage due to permanent deformation and Characteristic Curvature for damage due to fatigue cracking.
  • 2. In the deflection analysis using the 2017 MDP, two representative deflections were obtained, namely representative D<sub>0</sub> for damage due to permanent deformation and representative D<sub>0</sub>-D<sub>200</sub> for damage due to fatigue.
  • 3. From the results of the deflection analysis using the MDP and Austroads methods, segmentation division is divided into two sections where the first section starts from STA 10+000 to 12+656 and the second section starts from ST.
  • 4. In the overlay analysis using the Austroads method, it is found that the thickness values vary for each temperature on the fatigue damage, while for permanent deformation damage there is no need for an overlay with a design life of 10 years.
  • 5. The overlay thickness obtained from the analysis results with Austroads methods are 114 mm and 98 mm for WMAPT 47°C, 105 mm for WMAPT 42°C, 97 mm for WMAPT 41°C, 85 mm for WMAPT 38° C, and 83 mm for WMAPT 35°C.
  • 6. From the results of the analysis, it is found that the temperature difference can affect the value of the overlay thickness produced.
  • 7. In the overlay analysis using the 2017 Pavement Design Manual method, the overlay thickness is consistent with 80 mm for all segments for fatigue damage, while for permanent deformation damage there is no need for an overlay during the design life of 10 years.

References

AASHTO. (1993). Guide for Design of Pavement D.C: Structures. Washington Association of State Highway and Transportation Officials.

Austroads. (2008). Technical Basis of Austroads Guide to Pavement Technology Part 2: Pavement Structural Design. Sydney: Austroads Ltd.

Austroads. (2009). Guide to Pavement Technology Part 7 Pavement Maintanance. Sydney: Austroads

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