PERBANDINGAN KARAKTERISTIK STRUKTUR PERKERASAN DENGAN MENGGUNAKAN BENKELMAN BEAM DAN FALLING WEIGHT DEFLECTOMETE

• Main Author: Novara Nefiadi, Efi
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/2748
• Institution: Institut Teknologi Bandung

COMPARISON OF PAVEMENT STRUCTURAL CHARACTERISTICS AS DETERMINED USING BENKELMAN BEAM AND FALLING WEIGHT DEFLECTOMETER, Novara Nefiadi, Efi, 1990, Program Sistem dan Teknik Jalan Raya, Fakultas Pasca Sarjana, Institut Teknologi Bandung. The measurement of deflection basin profiles on flexible pavements was carried out simultaneously with a Benkelman Beam, using both the TRRL transient approach in conjunction with a Curvature Meter and the CGRA rebound test method, and with a Falling Weight Deflectometer (FWD) dynamic testing method at complementary test points. The standard axle load of 8160 kg used in Benkelman Beam testing was compared with a peak load level of the FWD at 580 kPa, which provides a similar applied stress level. The deflection test methods were carried out on pavement surfaces overlaid in the past two-three years with Hot Rolled Sheet (HRS) for a number of roads in West Java. Dynamic Cone Penetrometer (DCP) testing was also used to obtain CBR values of subgrade. Several deflection parameters namely maximum deflection, Surface Curvature Index (SCI), Radius of Curvature (R), deflection at an offset distance of 1.2 m and 1.5 m were obtained and compared. Curve fit deflection bowls obtained for the plotted points using smooth best curves expressed by LEGER & AUTRET were also considered. Pavement structural characteristics, in terms of Modulus of Elasticity, stresses and strains, were .analysed using the HOGG-BURMISTER model, DCP-BURMISTER and MIURA & TOBE approaches, the YEH expression, the RUFFORD approach and several computer programs, namely ELMOD, BISAR and PAS1. The different methods resulted in some different values of structural characteristics. However, most comparisons were highly correlatable, except for relationships obtained involving the DCP tests. Good correlations were also found in relationships between deflections obtained by FWD and Benkelman Beam. As recorded elsewhere, the Benkelman Beam deflection was found to be greater than the corresponding FWD deflection, except where deflections were less than 0.4 mm. The difference can be at least partly attributed to surface creep effects. However, poor correlations were indicated in the relationships between SCI and R as obtained by the FWD and Benkelman Beam. This resulted in poor correlations between Modulus of Elasticity, stresses and strains evaluated from FWD and Benkelman Beam deflection basins. Some relationships between structural characteristics including SCI or R and Dmax, deflections at an offset distance of 1.2 m or 1.5 m and subgrade modulus, SCI with tensile strain, and Dmax and compressive strain were also established