Abstract-Aggregate gradation is one important part of the performance of asphalt mixture. Workability is one of the important parameters in asphalt mixture design that can easily be done in the field. Marshall compactor type is the most widely used in Indonesia even in the world. Therefore it is necessary to measure the workability using a type of Marshall compactor. The purposes of this study were: (1) measures the workability of asphalt concrete on five aggregate gradation targets that would be obtained the relationship between gradation index (GI) and workability index (WI), and (2) Workability is one of the important parameters in asphalt mixture design that can easily be done in practice, not just a mixture must be strong and durable. The parameters workability with Workability Index (WI) at 8 types of mixtures Hot Rolled Asphalt (HRA) using a gyratory compactor [3]. The results showed that the mixture with a mixing temperature of 150 °C has the best workability (WI> 6) than on mixing temperature of 120 °C and 75 °C reduction in temperature caused by the transport process, placed and compacting. Reduction temperatures below 120 ° C will result in a mix of hard compacted so that it will have a low density, high air voids, and high permeability.The workability on a type of mixture of Asphalt Treated Base (ATB), Asphalt Concrete (AC), Hot Rolled Sheet (HRS) using Marshall compactor was evaluated [4]. Asphalt concrete aggregate grading is set at five types of gradation are gradation lower limit, between the lower and the middle, the middle limit, between the middle and the upper limit, and the upper limit. However, workability is measured only at middle limit optimum bitumen content, so it has not demonstrated the workability of the mixture for another aggregate gradation. How the test requires a relatively large specimen. Asphalt mixture is measured workability requires 6 specimens. If the duplo specimen, it takes 12 specimens only to find the one value of workability. Use of the different specimen of the mixture will be very prone to drift results because the position of the aggregate in the mix will be different with another specimen, the temperature will change, and the mixing process is done manually. The results showed the value of the workability of the asphalt concrete for five types of gradation does not have a significant influence. WI values of asphalt concrete are between 2.389 up to 2.396 [4].Workability of a large stone aggregate gradation, the maximum aggregate size is 37.5 mm was examined [5]. Three types of compactor, namely compactor press play or gyropac, kango hammer vibration compactor, and compactor with impact techniques of free fall (Marshall compactor). Workability is influenced by the level of asphalt and aggregate gradation. Asphalt content, the greater the content of asphalt gives a tendency easier for compacted or treated. Fuller aggregate gradation approach provides better workability. Further [5] make the relationship between the height of the test specimen with the number of gy...
Batang, merupakan lokasi rawan kecelakaan dengan rata-rata 12 kejadian kecelakaan per tahun. Tujuan makalah ini adalah memaparkan hasil Audit Keselamatan Infrastruktur Jalan secara kuantitatif dan kualitatif berdasarkan hasil ukur defisiensi keselamatan di lapangan agar menjadi model evaluasi bagi auditor jalan. Data analisis yang digunakan adalah hasil ukur dan pengamatan defisiensi keselamatan infrastruktur jalan di lokasi penelitian serta data anatomi kecelakaan yang dikeluarkan oleh kantor Polda Jateng. Hasil audit dihitung dengan indikator nilai resiko penanganan defisiensi Hasil audit keselamatan jalan menunjukkan bahwa beberapa bagian fasilitas jalan berada dalam kategori "bahaya" dan atau "sangat berbahaya", yang harus segera diperbaiki untuk memperkecil potensi terjadinya kecelakaan, yaitu: (1) aspek geometrik yang meliputi jarak pandang menyiap, posisi elevasi bahu jalan terhadap elevasi tepi perkerasan, radius tikungan; (2) aspek perkerasan yang meliputi kerusakan berupa alur bekas roda kendaraan; (3) aspek harmonisasi yang meliputi rambu batas kecepatan di tikungan, lampu penerangan jalan, dan sinyal sebelum masuk tikungan.
The increasing of commodity freights production in the internal – regional zone is a national development strategy to create interzone consolidation to accelerate the productivity of an internal – regional zone staple commodity. Sustainable freight transportation development requires a strategic direction based on the commodity freights production dominant characteristics in an internal-regional zone. This research has been done to estimate the distribution model and route assignment model of staple alternative commodity. Estimated generation production of commodity freights movement in production zones is influenced by zone demographic variables, infrastructure, and means of transportation. Gravity method is used to estimate the distribution model and route assignment model by calibrating it with Newton-Raphson method. The application and development of the gravity method in the modelling analysis will determine the estimation effect of sustainable freights transportation needed. The computational simulation result is an approach of mathematical model illustration for complex and systematic estimation. Therefore, the modelling results can provide the direction of sustainable highway construction on the highway network system, will determine the effectiveness and efficiency of traffic movement, and distribute the movement
Current selection of aggregate gradation fails to explain completely the position of the aggregate gradation on a continuous scale. This study proposes a gradation index (GI) as a new parameter to determine the position of the aggregate gradation of the asphalt mixture on the continuous scale. The GI was used to develop a model of the Marshall properties. The aim of this study was to develop a model between the GI and bitumen content of the Marshall properties that includes density, voids in the mix (VIM), voids in mineral aggregate (VMA), voids filled with asphalt (VFA), stability, and flow. The materials used were unmodified Asphalt Cement 60/70 with bitumen content variation of 4.5% to 8.0% of the mix and five variations of the aggregate gradation. Curve fitting method is used to find partial correlation factor of the aggregate gradation and the bitumen content of the Marshall properties. Multiple Polynomial Regression (MPR) models were specified to find the relationship between the GI and bitumen content of the Marshall properties. The visualization of the relationship between the GI, bitumen content and Marshall properties used contour charts. The results showed that the MPR determines the model of the relationship between the GI and bitumen content of the density, VIM, VMA, VFA, stability, and flow that have a very strong relationship (R 2 > 0.9). Therefore, the model can be used to predict the Marshall properties.
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