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<![CDATA[PENGARUH STABILISASI ASPAL EMULSI TERHADAP KARAKTERISTIK LAPISAN TANAH DASAR YANG BERASAL DARI TANAH LUNAK ]]>
<![CDATA[Syahril, Syahril]]>;
<![CDATA[Suratman, Ilyas]]>;
<![CDATA[Sugeng Subagio, Bambang]]>;
<![CDATA[Siegfried, Siegfried]]>
<![CDATA[ Jurnal Transportasi Vol 11, No 1 (2011) ]]>
Publisher : <![CDATA[Jurnal Transportasi ]]>
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<![CDATA[Subgrade is an important part in road pavement construction, which serves as the foundation and must have the ability to bear the traffic load applying on the surface of the pavement. This study examined changes in the carrying capacity of soft soil after stabilization process using asphalt emulsion. The results of this study indicate that the stabilization process using asphalt emulsion can lower the Plasticity Index and increase the dry density and strength of the soil.Keywords: subgrade, stabilization, asphalt emulsion, Plasticity Index, dry density, soil strength.]]>
<![CDATA[PENGARUH STABILISASI ASPAL EMULSI TERHADAP KARAKTERISTIK LAPISAN TANAH DASAR YANG BERASAL DARI TANAH LUNAK ]]>
<![CDATA[Syahril, Syahril]]>;
<![CDATA[Suratman, Ilyas]]>;
<![CDATA[Sugeng Subagio, Bambang]]>;
<![CDATA[Siegfried, Siegfried]]>
<![CDATA[ Jurnal Transportasi Vol 11, No 1 (2011) ]]>
Publisher : <![CDATA[Jurnal Transportasi ]]>
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DOI: 10.26593/jt.v11i1.438.%p
<![CDATA[Subgrade is an important part in road pavement construction, which serves as the foundation and must have the ability to bear the traffic load applying on the surface of the pavement. This study examined changes in the carrying capacity of soft soil after stabilization process using asphalt emulsion. The results of this study indicate that the stabilization process using asphalt emulsion can lower the Plasticity Index and increase the dry density and strength of the soil.Keywords: subgrade, stabilization, asphalt emulsion, Plasticity Index, dry density, soil strength.]]>
<![CDATA[Modelling Subgrade Modulus Using Deflection of Falling Weight Deflectometer ]]>
<![CDATA[Siegfried Siegfried]]>;
<![CDATA[Sufanir A M S]]>
<![CDATA[ International Conference on Engineering and Technology Development (ICETD) 2017: 4rd ICETD 2017 ]]>
Publisher : <![CDATA[Bandar Lampung University (UBL) ]]>
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<![CDATA[The value of sub grade modulus is required for pavement management system (PMS), design and evaluation of a pavement system. In the overlay thickness design the first thing should be carried out is to predict the modulus of existing sub grade. While in the PMS this value is used for reference in segmenting of tested road links. There are several methods available to calculate subgrade modulus based on the Falling Weight Deflectometer (FWD) deflections. Generally, calculation of sub grade modulus from FWD deflections need information of total pavement thickness above sub grade level. This information is quite difficult because it needs testing using equipment called Ground Penetrating Radar (GPR). This equipment is relatively expensive and the main thing it needs the skilled engineers to interpret the GPR results. This research aims to find the correlation between FWD deflection to that of the modulus of existing subgrade, so that the calculation of sub grade modulus based on FWD deflection does not need the information of total pavement thickness anymore. The research starts by simulating pavement under standard traffic load (4200 kg) and then calculate the surface deflection on the points which are located as exactly same as the FWD geophone are. The simulated pavement model consists of 3 layers i.e. surface layer of flexible, base layer of granular, and sub grade. A computer program called KenPave is used for this simulation. This program is able tocalculate the deflection, stress, and strain in any location of pavement system by inputting layer thicknesses, modulus of each layer as well as Poisson’s ratio. There are 3800 variations of simulated pavement system which vary modulus and thickness of each layer.After that it is carried out modeling of subgrade modulus and the value of deflection at the 900 mm offset (D 900). It is then obtained a logarithmic model that correlates the value of sub grade modulus and the deflection at 900 mm offset. The correlation factor is quite good (r21, A M S Sufanir = 87.5%). The final step of the research is to test this model using field data of FWD and the results are compared to back calculation results using FWDArea and Elmod programs. It is then found that when the results are plotted each other, they all fall around line of equality. It means that the sub grade modulus obtained from the model is not significantly different to that of back calculation result. In the other words, the logarithmic model between sub grade modulus and FWD deflection of 900 mm offset is acceptable. This model could help pavement engineers for predicting the modulus of existing sub grade very fast.]]>
<![CDATA[PENGARUH STABILISASI ASPAL EMULSI TERHADAP KARAKTERISTIK LAPISAN TANAH DASAR YANG BERASAL DARI TANAH LUNAK ]]>
<![CDATA[Syahril Syahril]]>;
<![CDATA[Ilyas Suratman]]>;
<![CDATA[Bambang Sugeng Subagio]]>;
<![CDATA[Siegfried Siegfried]]>
<![CDATA[ Jurnal Transportasi Vol. 11 No. 1 (2011) ]]>
Publisher : <![CDATA[Forum Studi Transportasi antar Perguruan Tinggi (FSTPT) ]]>
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DOI: 10.26593/jtrans.v11i1.438.%p
<![CDATA[Subgrade is an important part in road pavement construction, which serves as the foundation and must have the ability to bear the traffic load applying on the surface of the pavement. This study examined changes in the carrying capacity of soft soil after stabilization process using asphalt emulsion. The results of this study indicate that the stabilization process using asphalt emulsion can lower the Plasticity Index and increase the dry density and strength of the soil.Keywords: subgrade, stabilization, asphalt emulsion, Plasticity Index, dry density, soil strength.]]>
<![CDATA[Menentukan Modulus Elastisitas Stabilisasi Subgrade Berbasis Defleksi ]]>
<![CDATA[Sri Atmaja P. Rosyidi]]>;
<![CDATA[Niken Wukirasih]]>;
<![CDATA[Siegfried Siegfried]]>
<![CDATA[ Jurnal Rekayasa Sipil Vol 18, No 1 (2022) ]]>
Publisher : <![CDATA[Civil Engineering Departement, Andalas University ]]>
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DOI: 10.25077/jrs.18.1.1-16.2022
<![CDATA[Metode evaluasi perkerasan jalan berbasis teknologi tidak merusak atau non-destructive testing (NDT) merupakan pendekatan pengujian yang diperlukan saat ini dalam menjalankan sistem manajemen perkerasan jalan. Pengujian NDT memiliki keunggulan dari pengujian konvensional berbasis laboratorium maupun pengujian lapangan yaitu lebih cepat, ekonomis dan meminimalisasi gangguan pelaksanaan pengujian di lapangan serta tidak meninggalkan kerusakan pada struktur yang dievaluasi. Makalah ini bertujuan untuk mengukur modulus elastisitas bahan subgrade atau tanah dasar yang distabilisasi dengan menggunakan pengujian NDT Light Weight Deflectometer (LWD) Pusjatan. Penelitian dilaksanakan metode eksperimen dimana pengujian LWD dilaksanakan di model fisik lapisan tanah dasar perkerasan jalan dengan skala 1:1, dengan dimensi 3 × 1 m dan tebal 1 m. Tanah dasar berasal dari tanah lempung ekspansif yang diberikan bahan tambah untuk stabilisasi. Pengujian dilakukan pada 16 titik pengamatan untuk 0 hari, 3 hari dan 7 hari. Pengujian LWD menganalisis lendutan dengan menilai deformasi vertikal dari beban yang dijatuhkan di atas lapisan perkerasan jalan. Peralatan LWD selain digunakan untuk mengukur kekakuan bahan perkerasan, alat ini mudah dioperasikan dan memiliki dimensi alat yang cukup sederhana sehingga praktis untuk dapat untuk digunakan di lokasi konstruksi dengan berbagai kondisi. Hasil pengujian LWD merupakan nilai modulus elastisitas dinamis tanah dari analisis lendutan dengan pendekatan Boussineq. Dari penelitian ini ditemukan bahwa alat LWD secara efektif dapat mengukur kualitas dalam nilai kekakuan lapisan subgrade selama masa peningkatan daya dukung tanah yang distabilisasi. selama tahap konstruksi. Terdapat peningkatan daya dukung tanah lapisan subgrade yang dapat diukur, yaitu nilai modulus elastisitas pada masing-masing hari pengamatan 0, 3 dan 7 hari. Perbandingan empirik pengujian LWD terhadap nilai modulus elastisitas dari korelasi DCP (dynamic cone penetrometer) menunjukkan nilai korelasi yang baik dengan nilai modulus elastisitas LWD yang lebih besar dibandingkan hasil pengujian DCP.]]>
<![CDATA[Calculation of Effective Structural Number Using Simple Neural Network for Some Road Links in Indonesia ]]>
<![CDATA[Siegfried Syafier]]>
<![CDATA[ Jurnal Tiarsie Vol 14 No 2 (2017): Jurnal TIARSIE 14.2 ]]>
Publisher : <![CDATA[Fakultas Teknik Universitas Langlangbuana ]]>
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DOI: 10.32816/tiarsie.v14i1.15
<![CDATA[In the pavement maintenance system, the parameter of effective structural number (SNeff) would be a considered factor in deciding whether a road link would be repaired or not. To calculate this parameter, it is required the testing of Falling Weight Deflectometer (FWD) and information of layer composition and thicknesses. The combination of these information and using the method of AASHTO’93, it can be calculated the SNeff. These two information generally would be gained through the testings of core drill and test pit which would take time and cost. To overcome these problems, the neural network method or precisely the artificial neural network is developed for analysis of pavement structure. From the analysis, it can be said that the neural network of single perceptron can be used for predicting the SNeff with an acceptable error. In general the value of SNeff obtained from neural network calculation is lower than that of AASHTO’93. In this paper it is also recommended to develop the neural network using multi layer perceptron for the use on pavement system analysis that might be decreasing the error.]]>
<![CDATA[Penggunaan Light Weight Deflectometer Pusjatan Untuk Quality Control Pekerjaan Pemadatan Tanah Dasar ]]>
<![CDATA[Siegfried Syafier]]>
<![CDATA[ Jurnal Tiarsie Vol 15 No 2 (2018): Jurnal TIARSIE 15.2 ]]>
Publisher : <![CDATA[Fakultas Teknik Universitas Langlangbuana ]]>
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DOI: 10.32816/tiarsie.v15i2.35
<![CDATA[Pemadatan merupakan salah satu aktivitas yang perlu mendapat perhatian penuh dalam pelaksanaan konstruksi suatu sistem perkerasan jalan. Untuk itu perlu dilakukan quality control yang ketat dalam pelaksanaannya. Tanah dasar sebagai bagian dari sistem perkerasan jalan merupakan bagian yang tidak terpisahkan dari sistem tersebut. Kebutuhan akan tanah dasar yang kuat dimulai dari proses pemadatan dan pengawasan pelaksanaannya. Light Weight Deflectometer (LWD) Pusjatan menjadi salah satu alternatif alat untuk melaksanakan quality control pemadatan. Terlihat bahwa dengan menggunakan alat LWD Pusjatan ini sebagai alat bantu quality control beberapa keuntungan bisa didapat antara lain efisien dari segi waktu, biaya, dan jumlah personil yang dibutuhkan.]]>
<![CDATA[Studi Eksperimental Pengaruh Penggunaan Karet Alam Pada Pen 60/70 Terhadap Karakteristik Aspal ]]>
<![CDATA[Alfhi Iskandar]]>;
<![CDATA[Indah Arlini]]>;
<![CDATA[Siefried Syafier]]>;
<![CDATA[Fauzia Mulyawati]]>
<![CDATA[ Jurnal Rekayasa Infrastruktur Vol. 8 No. 2 (2022): Jurnal Rekayasa Infrastruktur ]]>
Publisher : <![CDATA[Program Studi Teknik Sipil Universitas Wiralodra ]]>
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DOI: 10.31943/jri.v8i2.172
<![CDATA[Indonesia mempunyai perkembangan moda transportasi tinggi sehingga sarana dan prasarana harus memadai. Bahan yang digunakan pada jalan yaitu aspal Pen 60/70. Namun, masih banyak jalan yang mengalami kerusakan karena aspal yang digunakan tidak dapat menahan beban berlebih, dan tidak tahan terhadap suhu dengan temperatur tinggi. Sehingga dibuatlah modifikasi aspal menggunakan bahan tambah berupa karet alam. Pengujian ini bertujuan untuk mengetahui karakteristik aspal dengan bahan tambah karet alam guna meminimalisir kerusakan pada perkerasan jalan. Metode yang digunakan ialah metode kuantitatif dengan melakukan uji laboratorium dan membuat benda uji sesuai dengan standar ketentuan aspal. Hasil dari pengujian karakteristik aspal Pen 60/70 dengan aspal karet menunjukan bahwa aspal dengan campuran karet alam lateks pravulkanisasi mengalami peningkatan dalam kinerja pencampuran dan elastisitas pada aspal karet serta menjadikan aspal lebih lengket dan flexible sehingga tidak mengurangi kerekatan yang mengakibatkan retak pada jalan akibat beban berlebih. Kata kunci: Aspal Karet, Aspal Pen 60/70, Karet alam, Lateks pravulkanisasi, perkerasan jalan]]>
<![CDATA[PREDIKSI TEBAL LAPISAN BERASPAL MENGGUNAKAN DATA LENDUTAN FWD DAN METODA NEURAL NETWORK UNTUK SINGLE LAYER PERCEPTRON ]]>
<![CDATA[Siegfried Siegfried]]>
<![CDATA[ Jurnal Jalan-Jembatan Vol 26 No 1 (2009) ]]>
Publisher : <![CDATA[Direktorat Bina Teknik Jalan dan Jembatan ]]>
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<![CDATA[At the time the use of non destructive test for pavement has been a trend because of its effectiveness and mobility. Falling Weight deflectometer (FWD) is famous equipment for this aim. Actually the use of FWD is to collect structural data in term of deflection. The deflection data also can be used to predict the thickness of bituminous layer using the neural network of single layer perceptron. For three locations tested it is found that the difference between the thickness obtained from test pit and the average result using this neural network calculation is less than 10%. It is recommended that this method can be considered to use for collecting pavement data especially for building a data base. Keywords : Neural network, Single layer perception, deflection, FWD]]>
<![CDATA[KAJIAN PENGARUH TEMPERATUR DAN BEBAN SURVAI TERHADAP MODULUS ELASTISITAS LAPISAN BERASPAL PERKERASAN LENTUR JALAN ]]>
<![CDATA[Djunaedi Kosasih]]>;
<![CDATA[Siegfried Siegfried]]>
<![CDATA[ Jurnal Jalan-Jembatan Vol 24 No 3 (2007) ]]>
Publisher : <![CDATA[Direktorat Bina Teknik Jalan dan Jembatan ]]>
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<![CDATA[The use of back calculation method in pavement system analysis is very common nowadays. There are many computer programs available to perform back calculation process on FWD deflection data. The results from back calculation process are the elastic moduli of pavement layers. These pavement layer moduli, particularly asphalt layer moduli, are affected by such factors as temperature and survey load. This study was carried out on jln. Sukarno-Hatta in Bandung where FWD deflection data were measured at various temperatures and survey loads. This paper outlines back calculation process performed comparatively using program BackCalc and program BackFAA. It was found that temperature and survey load influenced the resulting pavement moduli significantly, and as expected, the two computer programs resulted in quite consistent pavement moduli. Key words: FWD deflection bowl, back calculation process, program BackCalc, program BAKFAA]]>
