Road maintenance action program must begin with identification of road surface defects before compiling a work program. One method of identification of road defects is the Road Condition Index (RCI) method. This method is simpler than the other methods because the survey method is by visualizing. This study aims to identify road defects with the RCI method carried out by several surveyors and how defects occur on the Caruban-Ngawi road section.The method used in this study is by direct survey of primary data on road surface defects conditions. There were 3 surveyors who conducted a survey with normal and opposite directions along the road. Data slices are made at lengths of every 100 m to identify road defects. The data is processed by doing an average on each data which is then made a strip map of road defects image. Data processing was done by determining the percentage of defects categories ranging from good, moderate, light defects, and heavy defects.The results of the study showed that the survey conducted by several surveyors was good and the general results were not significantly different. This means that the surveyors have almost the same perception in terms of assessing the condition of road defectss with the RCI method. The condition of road pavement on the Caruban-Ngawi road in general can be said that the road is still in good condition where heavy defects road damage in the normal and opposite directions is only 1.13% and 0.28% respectively.

Batu Tourism City is located in a mountainous area, so based on information from the BNPB, it has quite a large potential for landslides. Landslide hazards can frequently disrupt public traffic due to road cuts. Landslide mapping digitally will contribute to handling and mitigation activities since the database can be updated in real time to anticipate landslide hazards. This study aims to map landslide-prone areas located in the Payung zone, Songgokerto Village, and Batu City. Landslide areas can be determined by mapping analysis using GIS software. GIS can determine the classification level for a landslide susceptible area. Some input data that will influence landslides, such as rainfall, wind, earthquakes, etc., was collected as the control parameters. All parts of the study area could be classified as areas with minor, medium, and major potential for landslides. Primary data are collected from geo-surveying (aerial images) using drone devices for interpretation of landslide susceptibility areas, geophysical to identify the type of soil or rock layers that completed their behavior, and slip planes as well using geo-electric, geotechnical engineering to predict slope stability with the correlation from cone penetration test (CPT) data, and geo-hydraulic to observe the rainfall and the catchment area model using the available secondary data. Geometrically, measurement data found that the average slope angle at the upper and lower of the East Java Province highway is around 40–50o. Studies from geophysical data identified that the hilly terrain in the object study area has been dominated by the weathered rock layer. Geotechnical data obtained shows the soil layers at the slope location will be stable with the water content under 35% during the dry season and may become unstable with the water content reaching over 50% due to the increase in saturation during the rainy season. The landslide that occurred was more caused by seepage behavior from surface water flow towards the sloping plane, and then the safety factor during the rainy season reached the critical values at SF = 0.58. During the dry season, the unsaturated process due to the temperature change generates a safety factor (SF) of more than 1.2. The compilation data produced maps of susceptible landslides and surface flow distribution. Doi: 10.28991/CEJ-2023-09-04-016 Full Text: PDF

The paper discusses the comparison of fly ash with Lapindo mud as a land stabilizer for a landfill in Pasuruan, Indonesia. Land for landfills has a low level of stability due to the condition of garbage that has accumulated and undergoes a process of decay. This land condition is less favorable to support the construction of the building above it if one day the location is used for construction. Therefore, it is necessary to stabilize the soil first. The purpose of this study was to determine the effect of adding a mixture of TPA soil with fly ash and Lapindo mud. The method used by sieve testing and compaction of the specimens for each treatment consisted of a mixture of TPA soil with fly ash and TPA soil with Lapindo mud, while the percentages of fly ash and Lapindo mud to the dry weight of the original soil were respectively 0 %, 10 %, 15 %, and 20 %. The results showed that stabilization of the landfill with fly ash reduced the silt content while stabilization with Lapindo mud increased the levels of silt in the landfill so that fly ash was better than Lapindo mud for stabilization of the landfill. The specific gravity values for both stabilization mixtures increased equally. Based on the results of the standard compaction test for the addition of a mixture of fly ash, the OMC value decreases and the greater the value of dmaxs indicates that fly ash is good for landfill stabilization, while the addition of a mixture of Lapindo mud increases the OMC the smaller the value of dmaxs. For the direct shear test of the two mixed soils, the value of the internal friction angle (Æ) increased. The percentage value of the optimum mixture of mixed soil+fly ash is 14 % with an internal shear angle (Æ) of 38°, while the stabilization of landfill with Lapindo mud obtained the optimum mixture percentage value of 11 % with an internal shear angle (Æ) of 31°

Abstract:The landfill in eks sanitary landfill of city now days not yet can be to built building, althought the extension enough represention are developing special of economic sector, The landfill become no productif area because have bearing capacity and compebility are low. The problem solve to landfill is done stabilization with fly ash .The sampel of landfill taken from ex sanitary landfill Lhowok Doro, Gadang, Malang city, while the sampel fly ash from PLTU Paiton, Probolinggo. The composition mix fly ash to add landfill are 5%, 10%, 15% and 20% with increment are 7 days. The main tools of research are unconfined compression tools and procedure of test use ASTM (2003). The results of research indicate the stabilization with fly ash can be repair properties and mechanics of landfill. The properties of soils : water content decrease 9,14%, spesific gravity increase 0,13 after stabilization. While the mechanics of landfill increase 3.02 kg/cm 2 .Key words : Landfill, fly ash, stabilization, index properties, mechanics of soils.Abstrak: Tanah bekas timbunan sampah (landfill) di lokasi eks TPA sampah perkotaan sampai saat ini banyak yang belum dapat digunakan untuk mendirikan bangunan, padahal luasnya cukup representatif untuk memacu pembangunan khusunya sektor perekonomian suatu wilayah. Landfill ini menjadi lahan tidur karena mempunyai sifat yang buruk untuk bangunan yaitu daya dukung yang rendah dan komprebilitas yang tinggi. Guna mengatasi permasalahan tersebut maka diadakan penelitian perbaikkan landfill dengan menggunakan fly ash sebagai bahan stabilisasinya. Sampel landfill diambil dari eks TPA sampah Lhowok Doro, Gadang, Kota Malang, sedangkan sampel fly ash diambil dari PLTU Paiton, Probolinggo. Komposisi campuran fly ash sebesar 5%, 10%, 15, dan 20% dari berat kering landfill dengan masa perawatan 7 hari. Alat uji utama digunakan alat tekan bebas dan prosedur uji digunakan standar ASTM (2003). Hasil penelitian memperlihatkan bahan stabilisasi dengan fly ash dapat memperbaiki sifat fisis dan mekanik landfill. Pada sifat fisis : kadar air mengalami penurunan 9,14% dan spesific gravity mengalami peningkatan 0,13 setelah distabilisasi. Sementara pada sifat mekanik, kekuatan landfill menjadi semakin baik sebesar 3.02 kg/cm 2 . Kata-kata Kunci : Tanah bekas timbunan sampah, fly ash, stabilisasi, sifat fisis, sifat mekanis. PENDAHULUANDalam setiap pekerjaan teknik sipil tidak lepas dengan aspek yang paling penting yaitu tanah. Beberapa permasalahan yang sering dijumpai pada hakekatnya disebabkan sifat teknis tanah yang buruk ditandai dengan air tanah yang berlebihan, komprebilitas yang besar dan daya dukung yang rendah. Beberapa tanah memiliki perubahan volume yang signifikan seiring dengan perubahan kadar airnya. Salah satu dari jenis tanah yang mempunyai sifat fisis dan mekanik yang buruk adalah tanah bekas timbunan sampah (landfill) bekas Tempat Pembuangan Akhir (TPA) sampah perkotaan.Tanah bekas timbunan sampah (landfill) adalah tanah bekas timbunan sampah yang sudah berumur lebih dari 20 tahun. Akibat a...

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