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Djoko Widajat
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Civil Engineering, Building, Construction & Architecture

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PENGARUH TEMPERATUR PEMANASAN ASPAL DAN AIR PEMBENTUK ASPAL BUSA TERHADAP SIFAT ASLI ASPAL Djoko Widajat
Jurnal Jalan-Jembatan Vol 27 No 3 (2010)
Publisher : Direktorat Bina Teknik Jalan dan Jembatan

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Abstract

Main material for foamed bitumen consists of asphalt and water. Asphalt properties which are viscous elastic and has a good cohesion create a support to become strong mixture. Clean water is one of the requirements to create foamed bitumen bubbles to meet the desired quality.. Furthermore, foamed bitumen quality is influenced by the heat temperature of the asphalt and precentage of water addition in foamed bitumen process. The quality of foamed bitumen is characterised by Expansion Ratio and Half Life. The paper analyses about the change of asphalt properties in foamed bitumen with WLB 10S (Wiertgen Laboratory - Scale for foam bitumen, 10S type) after addition of water. Asphalt is heated with variation of temperature from 160 - 180°C and variation of water addition from 1% to 5%. To know the change of asphalt properties, tests were conducted on foamed bitumen with water variation of the foamed bitumen from 0-4%. The tests included penetration, softening point, ductility and loss on heating (LOH) with time variaton test of 1 to 30 days. The result showed that penetration, softening point and LOH are almost similar to the original asphalt properties after water in foamed bitumen evaporated. After addition of wate, LOH parameter needs longer time to revert back to the original value. Based on the penetration Index, asphalt tends to have high temperature susceptibility in the beginning of test, however, it will change to be low temperature susceptible after days of testing period, Bitumen is still elastic (ductility > 140cm). To meet the criteria of expansion ratio and half time, high asphalt heating is not necessary. Key word : bitumen properties, foamed bitumen, Expansion Ratio, Half Life, asphalt Penetration Index
UJI COBA TEKNOLOGI DAUR ULANG CAMPURAN DINGIN DENGAN FOAM BITUMEN PADA JALAN PANTURA JAWA BARAT Djoko Widajat
Jurnal Jalan-Jembatan Vol 26 No 1 (2009)
Publisher : Direktorat Bina Teknik Jalan dan Jembatan

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Technology of recycling can be implemented in the road maintenance program such as road rehabilitation or betterment project. To construct new pavement base course, material for cold mix recycling comes from the existing surface or base pavement layer. An application of foam bitumen binder with addition of active filler, shows an increasing strength of mixture and the impact of water to the mixture can be reduced because of cohesion from fine material particle with the bitumen. Foam bitumen occurred when water and air with a pressure, dispersed into hot bitumen in the expansion chamber, causing foaming of bitumen spontaneously. Fume which occurred during process in contact between water and hot bitumen, trapped in small bubbles which caused bitumen physical characteristic temporary changed. Foam expansion causes asphalt volume increased but in the short time foam reduced and the asphalt volume back to the origin. To make a mixture, as possible aggregate is mixed rapidly with foam bitumen until homogenous mixture obtained. The higher the volume of foam bitumen resulted the higher the bitumen distribution in the mixture. This paper describes about recycling technology with foam bitumen as a binder which has been implemented in Pantura road link. This link is a strategic and economic transportation lane with high volume and heavy traffic loading. The existing pavement has thick bitumen surface course resulted from past overlays. Keywords : recycling, foam bitumen, reclaimed material, filler active.
PENGARUH PRECONDITIONING PADA PENGUJIAN BEBAN BERULANG BAHAN BERBUTIR TANPA PENGIKAT Djoko Widajat
Jurnal Jalan-Jembatan Vol 23 No 1 (2006)
Publisher : Direktorat Bina Teknik Jalan dan Jembatan

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Two variations of preconditioning are given for repeat loading test unbound material are1000 cycles and 100 cycles. The change of the confining pressure and total axial stress after each preconditioning, creates drop on the value of the strains increment. The proportion of dropping value for resilient strain is lower for 100 cycles than 1000 cycles preconditioning, from the equally lines. Whereas, the different between permanent strains increment for both preconditioning are not too significant. It shows that the resilient increment strains drop for 100 cycles smaller than 1000 cycles. Increasing the total number of pulses or cycles will influence on the increasing the increment of strains, the proportion of increment tend to become higher by increasing the cycles.
ALAT UJI MICRO DEVAL SEBAGAI ALTERNATIF PENGUJIAN DURABILITI AGREGAT Djoko Widajat
Jurnal Jalan-Jembatan Vol 22 No 3 (2005)
Publisher : Direktorat Bina Teknik Jalan dan Jembatan

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Micro Deval has been developed in Europe as aggregate wear test, however from one of the specification used in this country not only Micro Deval was used to classify aggregate type but also Los Angeles Abrasion Value. Data show that LAA Value increases as Micro Deva l value increases, but some data show that the value of LAA is low while the micro deval value is high. Micro deval can be used to test the aggregate wear in wet condition.
Comparison of aggregates properties from "West Java and Banten Province" and "Northern Ireland" Djoko Widajat
Jurnal Jalan-Jembatan Vol 26 No 1 (2009)
Publisher : Direktorat Bina Teknik Jalan dan Jembatan

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Abstract

Many types of aggregates are found in West Java and Banten Province and Northern Ireland where they are regarded as a valuable resource that is used to construct highways. There is a distinct difference in the specific types of aggregates present in each countries i.e. andesite in West Java and Banten Province and olivine basalt in Northern Ireland. Correlation of physical and mechanical data indicates that Northern Ireland aggregates are typically denser and stronger than the West Java and Banten aggregates.
KINERJA DAUR ULANG CAMPURAN DINGIN DENGAN ASPAL BUSA PADA LALU LINTAS BERAT Djoko Widajat; M. Sjahdanulirwan
Jurnal Jalan-Jembatan Vol 26 No 3 (2009)
Publisher : Direktorat Bina Teknik Jalan dan Jembatan

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Abstract

Cold recycling is one of technology alternative which can be prefend in selecting the strategy alternative for road rehabilitation project. Learning about the development technology. we also learn about the weaknesses of it. The pavement assessment condition, which sustain heavy traffic laod in the road trial, has been identified. In order to evaluate the performance of recycling technology, laboratory testing for material properties, mixture as well as field observation have been conducted. The evaluatiins consist of material properties, mixture, construction and pavement performance since the opening traffic until the age of construction in approximately 2 years. The result of laboratory test shows that the mixture strength criteria meet the specification, whereas the field assessment based on functional condition and from structural pavement indicates that pavement performance decreases, this shown by occuring rutting in the some parts of the wheel track. Based from this result, it is predicted that there is a correlation between material, mixture and construction method and pavement service life. The construction method should be developed in the future to minimize early deterioration. This paper describes about the evaluation result for recycling technology with binder material of foam bitumen which have been used in road link with heavy traffic load Jatibarang - Palimanan, Panturan, West Java. Key word : cold mix, recycling, foam bitumen, RFB (Recycling by Foam Bitumen) , pavement performance.
INDIKATOR DAN INSPEKSI KINERJA PEMELIHARAAN JALAN PADA BENTUK PERFORMANCEBASED CONTRACT (PBC) Djoko Widajat
Jurnal Jalan-Jembatan Vol 21 No 4 (2004)
Publisher : Direktorat Bina Teknik Jalan dan Jembatan

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Abstract

Road criteria in PBC are shown by performance indicator, which have to e achieveds during service life. During this time continue monitoring to all road asset is conduted to guarantee that performance indicator requirement performed. Road pavement have to meet roughness, deterioration have to be minimise, deflection and surface skid resistance. Time allowed for treating non-compliance has to be determine to sustain the road pavement condition stable. In routine maintenance contract conventional, repairing non-compliance is detailed, while in PBC system is not. The treatment is given to the contractor initiative. This paper gives a types of performance indicator for road pavement asset which still to be discussed if PBC system will be implemented in Indonesia
Co-Authors M. Sjahdanulirwan Sjahdanulirwan, M.