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FAKULTAS PASCA SARJANA - INSTITUT TEKNOLOGI BANDUNG PROGRAM SISTEM DAN TEKNIK JALAN RAYA COMPARISON OF PAVEMENT STRUCTURAL CHARACTERISTICS AS DETERMINED USING BENKELMAN BEAM AND FALLING WEIGHT DEFLECTOMETER
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Page 1: COMPARISON OF PAVEMENT STRUCTURAL CHARACTERISTICS …digilib.itb.ac.id/files/disk1/35/jbptitbpp-gdl-s2-1990-efinovaran... · summary comparison of pavement structural characteristics

FAKULTAS PASCA SARJANA - INSTITUT TEKNOLOGI BANDUNG

PROGRAM SISTEM DAN TEKNIK JALAN RAYA

COMPARISON OF PAVEMENT STRUCTURAL CHARACTERISTICSAS DETERMINED USING BENKELMAN BEAM AND

FALLING WEIGHT DEFLECTOMETER

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SUMMARY

COMPARISON OF PAVEMENT STRUCTURAL CHARACTERISTICS AS DETERMINEDUSING BENKELMAN BEAM AND FALLING WEIGHTDEFLECTOMETER, Novara Nefiadi, Efi, 1990, Program Sistem danTeknik Jalan Raya, fakultas Pasca Sarjana, InstitutTeknologi Bandung.

The measurement of deflection basin profiles onflexible pavements was carried out simultaneously with aBenkelman Beam, using both the TRRL transient approach inconjunction with a Curvature Meter and the CGRA rebound testmethod, and with a Falling Weight Deflectometer (FWD)dynamic testing method at complementary test points.

The standard axle load of 8160 kg used in BenkelmanBeam testing was compared with a peak load level of the FWDat 580 kPa, which provides a similar applied stress level.The deflection test methods were carried out on pavementsurfaces overlaid in the past two-three years with HotRolled Sheet (HRS) for a number of roads in West Java.Dynamic Cone Penetrometer (DCP) testing was also used toobtain CBR values of subgrade.

Several deflection parameters namely maximumdeflection, Surface Curvature Index (SCI), Radius ofCurvature (R), deflection at an offset distance of 1.2 m arid1.5 in were obtained and compared. Curve fit deflection bowlsobtained for the plotted points using smooth best curvesexpressed by LEGER & AUTRET were also considered.

Pavement structural characteristics, in terms ofModulus of Elasticity, stresses and strains, were analysedusing the HOGG-BURMISTER model, DCP-BURMISTER arid MIURATOBE approaches, the YEH expression, the RUFFORD approachand several computer programs, namely ELMOD, BISAR and PAS1.The different methods resulted in some different values ofstructural characteristics. However, most comparisons werehighly correlatable, except for relationships obtainedinvolving the DCP tests.

Good correlations were also found in relationshipsbetween deflections obtained by FWD and Benkelman Beam. Asrecorded elsewhere, the Benkelman Beam deflection was foundto be greater than the corresponding FWD deflection, exceptwhere deflections were less than 0.4 mm. The difference canbe at least partly attributed to surface creep effects.However, poor correlations were indicated in therelationships between SCI and R as obtained by the FWD andBenkelman Beam. This resulted in poor correlations betweenModulus of Elasticity, stresses and strains evaluated fromFWD and Benkelman Beam deflection basins.

Some relatioLiships between structural characteristicsincluding SCI or R and Dmax, deflections at an offsetdistance of 1.2 m or 1.5 m and subgrade modulus, SCI withtensile strain, and Dmax and compressive strain were alsoestablished.

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RINGKASAN

COMPARISON OF PAVEMENT STRUCTURAL CHARACTERISTICS ASDETERMINED USING BENKELMAN BEAM AND FALLING WEIGHTDEFLECTOMETER, Novara Nefiadi, Efi, 1990, Program Sistem danTeknik Jalan Raya, Fakultas Pasca Sarjana, InstitutTeknologi Bandung.

Pengukuran profit lendutan pada perkerasan lenturdilakukan secara simultan dengan menggunakan Benkelman Beam,yaitu Metoda Transient TRRL dilengkapi dengar, CurvatureMeter, dan Metoda Rebound CGRA, bersama dengan pengukuranFalling Weight Deflectometer (FWD) pada titik-titik yangdipilih.

Beban standar as sebesar 8160 kg, yang digunakan padaBenkelman Beam, dibandingkan dengan beban maksimum FWDsebesar 580 kPa. Pengukuran lendutan dilakukan padspermukaan perkerasan yang dilapis ulang dua atau tiga tahunyang lalu dengan Hot Rolled Sheet (HRS) di beberapa jalan diJawa Barat. Percobaan Dynamic Cone Penetrometer (DCP) jugadilakukan untuk memperoleh nilai CBR tanah dasar.

Beberapa parameter lendutan yaitu lendutan maksimum,Indeks Lengkung Permukaan (SCI), Jari-jari Kelengkungan (R),lendutan pada jarak ofset 1,2 m dan 1,5 m diperoleh dandibandingkan. Kurva profit lendutari yang diperoleh untuktitik-titik yang dipilih dibuat dengan menggunakan persamaanLEGER & AUTRET.

Karakteristik struktur perkerasan, dalam bentuk ModulusElastis, tegangan dan regangan, dianalisa dengan menggunakanmodel HOGG-BURMISTER, pendekatan DCP-BURMISTER dan MIURA &TOBE, formula YEH, pendekatan RUFFORD dan beberapa programkomputer, yaitu ELMOD, BISAR dan PASS. Metoda yang berbedamenghasilkan nilai karakteristik struktur yang berbeda.Perbandingan hasil di atas menunjukkan korelasi yang baik,kecuali untuk hasil yang diperoleh dengan percobaan DCP.

Korelasi yang baik juga diperoleh untuk hubungan antaralendutan yang diperoleh dengan FWD dan Benkelman Beam. Hasillendutan dengan Benkelman Beam lebih besar daripada lendutanFWD, kecuali untuk nilai lendutan yang lebih kecil dari 0,4mm. Perbedaan ini disebabkan oleh pengaruh rangkak dipermukaan perkerasan. Korelasi yang rendah juga ditunjukkandalam hubungan antara SCI dan R yang diperoleh dengan FWDdan Benkelman Beam. Hal ini menyebabkan korelasi yang rendahpula antara Modulus Elastis, tegangan dan regangan yangdievaluasi dari profit lendutan FWD dan Benkelman Beam.

Juga ditunjukkan beberapa hubungan antara karakteristikstruktur, meliputi SCI atau R dan lendutari maksimum,lendutan pada jarak ofset 1,2 m atau 1,5 m dan modulus tanshdasar, SCI dan regangan. tarik, dan lendutan maksimum danregangan teken.

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