VALIDATION OF BITUMEN STIFFNESS MODULUS PREDICTIVE MODEL (VAN DER POEL NOMOGRAPH) TO DYNAMIC SHEAR RHEOMETER TEST RESULT OVER A CERTAIN RANGE OF TEMPERATURE AND LOADING TIME

• Main Author: INDRA PRAYOGA, YOGI
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/31748
• Institution: Institut Teknologi Bandung

<p align="justify">In flexible pavement structures, the asphalt pavement blend modulus (Smix) is the main material properties which are heavily dependent on asphalt stiffness modulus (Sbit) and mixed volumetric composition. In 1954, Van der Poel introduced a nomogram to estimate the modulus of asphalt stiffness (Sbit) based on penetration test results and softening point of asphalt associated with the loading time (t) and pavement layer temperature (T) (Van der Poel, 1954). In the early 1990s the Dynamic Shear Rheometer (DSR) tool began to be used as a fundamental asphalt test instrument to characterize mechanistic rheological properties that gave birth to Asphalt Performance Grade (PG) Specification (SHRP A-410,1994). Anderson and colleagues stated that the Van der Poel nomogram still has a fairly good accuracy level against the results of DSR testing on asphalt temperature over short space and time of loading (SHRP A-367,1994). The Van der Poel Nomogram is still used to estimate the modulus value of the asphalt stiffness in mechanical structural pavement structural planning. In 1998 Shell introduced a digital version of the nomogram in the form of software. The research was conducted to conform the proximity between the modulus value of the asphalt stiffness of the nomogram and the test results from DSR tool. A series of penetration testing, softening point and DSR under various conditions of aging, temperature and loading were carried out in this study in order to conform the proximity between the asphalt stiff modulus of the Van der Poel nomogram to the DSR test results. The results of the tests and calculations show that the Van der Poel nomogram still has a good accuracy level on the DSR test results over a certain temperature range and time of loading, the accuracy level decreases with the increase of strain value, the decrease in temperature and the increase of the aging of the asphalt.<p align="justify">