4.9 Analysis of asphalt overlay thickness using AASHTO 1993 method
This step includes an overlay analysis that refers to the AASHTO 1993 method. In this method, the steps conducted after the traffic data analysis were calculating
Table 4. Uniformity factor
| Segment | FK % | Category |
|---|---|---|
| 2+200 - 2+300 | 0.299 | FAIR |
| 4+700 - 4+800 | 0.287 | FAIR |
| 4+800 - 4+900 | 0.285 | FAIR |
| 9+700 - 9+800 | 0.284 | FAIR |
| 11+600 - 11+700 | 0.299 | FAIR |
| 12+000 - 12+100 | 0.277 | FAIR |
Table 5. Representative deflection values
| Segment | D1 Representative | - TAF (Graph) | D1 Rep. xTAF | |
|---|---|---|---|---|
| Oeginent | (inch) | - IAI (Glapii) | (inch) | |
| 2+200 - 2+300 | 0.0052 | 0.81 | 0.0042 | |
| 4+700 - 4+800 | 0.0092 | 0.71 | 0.0065 | |
| 4+800 - 4+900 | 0.0095 | 0.88 | 0.0084 | |
| 9+700 - 9+800 | 0.0142 | 0.88 | 0.0125 | |
| 11+600 - 11+700 | 0.0094 | 0.72 | 0.0067 | |
| 12+000 - 12+100 | 0.0092 | 0.81 | 0.0074 | |
the value of the Resilient Modulus (MR), the Effective Modulus of all pavement layers above the subgrade (Ep), and the value of ae to obtain the required overlay thickness. These values are based on the type of material used in the existing pavement.
Next was the calculation of the structural capacity (SN). From the calculations that have been conducted, the CBR value affects the value of the structural capacity of component analysis (SN<sub>eff-2</sub>) using a pavement layer (a) and a drainage system (m). However, in this calculation the minimum SN value is chosen, where the minimum SN value obtained is the \(SN_{\text{eff}}\) value based on the deflection test using FWD (SN<sub>eff-1</sub>). So that in this calculation, the CBR value is not so influential because it still produces an SN value that is greater than the SN value based on the deflection test. Calculation of structural capacity (SN) can be seen in Table 6 and Table 7.
From the calculation conducted, the required overlay thickness can be seen in Table 8 and Table 9.
To facilitate implementation in the field, the selected overlay thickness is the maximum overlay thickness, which is 10 cm for scenario 1 and 11 cm for scenario 2.
4.10 Analysis of asphalt overlay thickness using MEPDG 2008 method
In the overlay analysis using the MEPDG 2008 method, the values of stress and strain at the surface course to the subgrade are required, so the stress and strain values are obtained from the analysis of the KENPAVE program. The calculation of the stress and strain response using the KENINP and KENLAYER programs was conducted with 4 (four) trial thickness variations, namely 5 cm, 8 cm, 10 cm, and 15 cm and 3 variations of the CBR value 3, namely 6%, 10%, and 20%. Then,
Table 6 and 7. Recapitulation of SN and SN<sub>eff</sub> values for scenario 1 and scenario 2
| Scenario 1 | Sce | nario 2 | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Station | SNf | SN0 | SNeff-1 | SNeff-min | Station | SNf | SN0 | SNeff-1 | SNeff-min |
| 2+200 - 2+300 | 4.048 | 3.823 | 2.608 | 2.608 | 2+200 - 2+300 | 4.048 | 3.823 | 2.608 | 2.608 |
| 4+700 - 4+800 | 3.734 | 3.542 | 1.954 | 1.954 | 4+700 - 4+800 | 3.734 | 3.542 | 1.954 | 1.954 |
| 4+800 - 4+900 | 3.833 | 3.630 | 2.087 | 2.087 | 4+800 - 4+900 | 3.833 | 3.630 | 2.087 | 2.087 |
| 9+700 - 9+800 | 4.284 | 4.036 | 3.139 | 3.139 | 9+700 - 9+800 | 4.284 | 4.036 | 3.139 | 3.139 |
| 11+600 - 11+700 | 3.951 | 3.736 | 2.221 | 2.221 | 11+600 - 11+700 | 3.951 | 3.736 | 2.221 | 2.221 |
| 12+000 - 12+100 | 3.734 | 3.542 | 1.954 | 1.954 | 12+000 - 12+100 | 3.734 | 3.542 | 1.954 | 1.954 |
Table 8 and 9. Recapitulation of required overlay thickness for scenario 1 and scenario 2
| Station | SNf - SNeff min | Overlay Needs | Dol (cm) | Station | SNf - SNeff min | Overlay Needs | Dol (cm) |
|---|---|---|---|---|---|---|---|
| 2+200 - 2+300 | 1.293 | OVERLAY NEEDED | 8 | 2+200 - 2+300 | 1.439 | OVERLAY NEEDED | 9 |
| 4+700 - 4+800 | 1.646 | OVERLAY NEEDED | 10 | 4+700 - 4+800 | 1.781 | OVERLAY NEEDED | 11 |
| 4+800 - 4+900 | 1.614 | OVERLAY NEEDED | 10 | 4+800 - 4+900 | 1.746 | OVERLAY NEEDED | 11 |
| 9+700 - 9+800 | 0.984 | OVERLAY NEEDED | 6 | 9+700 - 9+800 | 1.145 | OVERLAY NEEDED | 7 |
| 11+600 - 11+700 | 1.589 | OVERLAY NEEDED | 10 | 11+600 - 11+700 | 1.730 | OVERLAY NEEDED | 11 |
| 12+000 - 12+100 | 1.646 | OVERLAY NEEDED | 10 | 12+000 - 12+100 | 1.781 | OVERLAY NEEDED | 11 |
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