Identifikasi Faktor-Faktor yang Mempengaruhi Nilai Idle TIME (IT) di Pelabuhan Dumai (Dermaga A)

Ports are place for docking, shipping and unloading. Any activities have done by any ships have some difference. Problem due shipping activities is idle time (IT) during working caused by several factors raining, loading, regulation, damaged crane ships, etc. Other problem from shipping a factor classification is necessity.Factors that cause idle time are classified into three groups. 1) Human error including waiting for truck, operator, worker, and delay for work. 2) Technical errors including emptying storage, damaged equipment, and damaged ship, 3) Factor fromnature including rain and tides. All these factors cause delays in shipping. Based on the analysis, the most dominant factor in fluctuation is due damaged equipments with the total number of hours were 283.6 hours a year. Mean for the dominant factor due damaged equipments waste 23.64 hours per month. Solution of the problems that occur are the good planning on shipping and co-ordination between companies and port management

Karakteristik Fisis dan Mekanis Abu Sawit (Palm Oil Fuel Ash) dalam Geoteknik

POFA is an agrowaste ash which is produced from fibers, nut shells, and empty fruit bunches when burnt at temperatures of about 800-10000C in boiler. The production of POFA is rising every year, it is disposed for landfills, now become an important environmental disposal issue. A large area is required for the disposal of these POFA waste materials. The landfill of POFA is the problem for the palm oil industry when it is not reused for any work. POFA contains a large amount of silicon dioxide with high pozzolanic reactivity and has high potential to be used in any engineering work. This research examined POFA characteristics in geotechnical application and its influence by curing periods on 0, 7 and 28 days. In this paper, physical and mechanical characteristics of POFA in geotechnical work will be shown. The chemical composition of POFA prove the existence of SiO2, Al2O3, Fe2O3 and CaO as important substances supporting pozzolan reaction during cured. The result shows that the characteristic of POFA has similar behaviour with sands. Coefficient of permeability decreased during curing periods. Besides, cohesion shear strength, angle of friction, cohesion undrained, and CBR value are improve during curing periods

Karakteristik Nilai Kuat Tekan Bebas Stabilisasi Semen Tanah CL-ML terhadap Siklus Pembahasan Pengeringan

The soil that classified as CL-ML soil have range of plasticity index around 4% s/d 7%, and liquid limit with range 12% s/d 30% according to the Casagrande Plasticity graph, this soil condition is very susceptible to the addition of water content so that cause soil at winter season being easily melted as a porridge and cracked as of existed at retrieval specimen location at dry season. This retrieval specimen location located at Government Office of Pekanbaru Area, Indonesia. This situation being problem if there is construction work above it such as road construction. Soil restoration is necessary for stabilizing soil. In this case used stabilizing soil chemically. Ihis research focuses to cycle process of wet-dry toward soil mechanical characterize effect that stabilized by cement. This research result showed that value of unconfined compressive strength toward wet-dry cycle have different values. Cement addition to CL-ML soil get very significant increasing of unconfined compressive strength. Highest increasing unconfined compressive strength is on 7 days curing, 3x 24 hours, drying second cycle about 1.636,51 kPa, this thing caused by cement that contained in 7 days cured soil reacted and turned into paste dan eventually cement that contained in soil start hardened, so that is able to increasing unconfined compressive strength value high enough

Analisis Kekuatan Daya Dukung Pondasi Helical Menggunakan Data Sondir pada Tanah Gambut

Bearing capacity of Helical Pile on peat soil can be obtained from cone penetration test (CPT). Bearing capacity based on CPT data is calculated by Bustamante & Gianeselli (LCPC) method, Schmertmann method, method Meyerhoff, Price & Wardle method, and Tumay & Fakhroo method. Meanwhile, there are two methods based on peat soil mechanisms to determine the bearing capacity of the helical pile such a cylindrical shear method and individual bearing method. This research evaluates bearing capacity of the five methods above by implementing two basic methods helical pile on peat soil that most closely to the actual bearing capacity. The results showed that the method Bustamante & Gianeselli (LCPC) to provide bearing capacity that most closely to the actual bearing capacity compared to other methods. Reduction factor is also necessary to modify bearing capacity the foundation Helical. After reduced, bearing capacity of each method has decreased significantly and tends to approach the actual bearing capacity

Korelasi antara Nilai CBR dan Nilai Kuat Geser sebagai Tanah Timbun

In constructing the roadway, subgrade is the important part to supporting the whole traffic load/construction load above. The bearing capacity of subgrade influences the flexible pavement, if bearing capacity is higher, then the application of flexible pavement is fewer to support the traffic load. Subgrade is affected by type of soil, density of soil, water content and others (Hendarsin, 2000). Generally, design of parking area uses the geometric design of road method. This case is inappropriate with actual condition, because the load support to parking area is static load. Nowdays, parking area planning uses CBR's data, while CBR is used to dynamic load estimation. Therefore, this research will be doing study about correlation between CBR value and UCS