ASSESSMENT OF SEMI ANALYTICAL OVERLAY DESIGN USING AASHTO 1986 METHOD
In the 1986 AASHTO Guide for Design of Pavement Structures, two procedures are described for evaluating the effective structural capacity of an existing pavement and calculating the overlay thickness needed to extend pavement life for a further specified period/loading. Deflection bowl data provided...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/13800 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | In the 1986 AASHTO Guide for Design of Pavement Structures, two procedures are described for evaluating the effective structural capacity of an existing pavement and calculating the overlay thickness needed to extend pavement life for a further specified period/loading. Deflection bowl data provided by a dynamic, non-destructive test (NDT) device, which as the Falling Weight Deflectometer (FWD), is required input for both procedures. In Indonesia the FWD is used mainly for research purposes and deflection data are analyzed using the ELMOD software programme.<p>This thesis describes an evaluation of the AASHTO 1986 procedures, referred to below as NDT Method 1 and NDT Method 2, using FWD data collected on the Jagorawi and Jakarta-Cikampek toll roads by the Institute of Road Engineering Bandung. Both procedures enable calculations to be made of subgrade modulus, structural capacity of the existing pavement, residual life and required overlay thickness with, and without the use of the remaining life factor (Fn).<p>The analysis shows that subgrade modulus determined using NDT Method 2 tends to be higher than that determined using NDT Method 1; the modulus of the Jagorawi Toll Road subgrade is higher than that of the Jakarta-Cikampek toll road. Residual life calculated by NDT Method 1 tends generally to be lower than that calculated by NDT Method 2.<p>On the Jakarta-Cikampek toll road, NDT Method 2 generally indicates a greater overlay thickness than does NDT Method 1, the Fn being excluded from both analyses. For this particular case, overlay thicknesses indicated for a 10-years design life by NDT Method 1, NDT Method 2 and ELMOD are 1.83, 1.96, and 1.80 inches, respectively;. there is thus good agreement between NDT Method 1 and ELMOD. If the Fra, is included in the analysis, average overlay thickness calculated using NDT Methods 1 and 2 is 6.20 inches. <br />
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