Identifikasi Dan Pemetaan Lahan Kritis Dengan Menggunakan Teknologi Sistem Informasi Geografis (Studi Kasus Das Jenerakikang Sub Das Jeneberang) Kabupaten Gowa Sulawesi Selatan

ABSTRACTThe increasein Population effected on increase land requirements that force the people to convert forest land into residental land which had an impact on the declining qulity of the environtment causing the land to be a critical. The objectives of this Research are: (1) to find out factors that affect the class of critical land (2) to find out the class of critical land (3) to find out contermeasures of critical land. The object of this study is land of DAS Jenerakikang. Primary data used include slope, soil structure, soil texture, effektive depth of soil, land management and land use. Secondary data used include DEM data, Citra Landsat-8, rainfall data, produktivity of land. The type of this research is deskriptif eksploratif with the analytical method used is the skoring analysis method to identifity the class of critical land. The result of the study show there are 4 factors that affect the class of critical land are topography, soil, erosion, and vegetation. There are 4 categories of critical land specifically class of critical land with an areal 32,02 hectares, class of rather critical land with an areal 2.734,1 hectares, class of potential critical land with an areal 1.088,8 hectares ang class of ncritical land with an areal 56,229 hectares. Countermesures of critical land make us of physical-mechanic with application terracing and biological/vegetative with application multiple cropping.ABSTRAKPenambahan jumlah penduduk mengakibatkan terjadinya peningkatan kebutuhan lahan yang memaksa masyarakat melakukan alih fungsi lahan hutan menjadi lahan pemukiman yang berdampak pada menurunnya kualitas lingkungan sehingga menyebabkan lahan tersebut menjadi kritis. Tujuan dari penelitian ini adalah: (1) Untuk mengetahui faktor yang mempengaruhi tingkat kekritisan lahan (2) Untuk mengetahui tingkat kekritisan lahan (3) Untuk mengetahui upaya penanggulangan lahan kritis. Objek penelitian ini yaitu Lahan di DAS Jenerakikang. Data primer yang digunakan meliputi data kemiringan lereng, struktur tanah, tekstur tanah, kedalaman efektif tanah, manajemen lahan dan data penggunaan lahan. Data sekunder yang digunakan meliputi data DEM, Citra Landsat-8, data curah hujan, produktivitas lahan. Jenis penelitian ini merupakan jenis penelitian deskriptif eksploratif dengan metode analisis yang digunakan yaitu metode skoring untuk mengidentifikasi tingkat kekritisan lahan. Hasil penelitian menunjukkan bahwa terdapat 4 faktor yang berpengaruh terhadap tingkat kekritisan lahan yakni topografi, tanah, erosi dan vegetasi. Terdapat 4 kategori lahan kritis yakni tingkat lahan kritis dengan luas 32,02 Ha tingkat lahan agak kritis dengan luas 2.734,1 Ha, tingkat lahan kritis potensial kritis dengan luas 1.088,8 Ha dan tingkat lahan tidak kritis dengan luas 56,229 Ha. Upaya penanggulangan lahan kritis menggunakan metode fisik–mekanik dengan penerapan terasering dan metode biologis/vegetatif dengan penerapan multiple Cropping.

Modifying Additives Effect on Use Properties of Asphalt Concrete

The article dwells on the results of the survey of the asphalt concrete modified with various additives. It contains the results of the impact made by the modifying additives on the physical mechanic and performance properties (rutting resistance, fatigue life and permanent deformation accumulation resistance) of the Type A Grade I asphalt concretes. In the article the regularities of the influence exerted by the formula-related and technological factors on the asphalt concrete properties were established. Consistent with the obtained results forecasting of rutting in accordance with AVTODOR STO 2.28-2016 and forecasting of fatigue damage accumulation on the basis of the Miner’s cumulative model of damage linear addition were executed. On the basis of the forecast results the interrepair life of the road structures with the pavement courses of asphalt concretes containing the surveyed modifiers was evaluated.

Study on cementitious properties of steel slag

The converter steel slag chemical and mineral components in China?s main steel plants have been analysed in the present paper. The electronic microscope, energy spectrum analysis, X-ray diffraction analysis confirmed the main mineral compositions in the converter slag. Converter slag of different components were grounded to obtain a powder with specific surface area over 400m2/kg, making them to take place some part of the cement in the concrete as the admixture and carry out the standard tests. The results indicate that the converter slag can be used as cementitious materials for construction. Furthermore, physical mechanic and durability tests on the concrete that certain amount of cement be substituted by converter steel slag powder from different steel plants are carried out, the results show that the concrete with partial substitution of steel slag powder has the advantages of higher later period strength, better frost resistance, good wear resistance and lower hydration heat, etc. This study can be used as the technical basis for ?Steel Slag Powder Used For Cement And Concrete?, ?Steel Slag Portland Cement?, ?Low Heat Portland Steel Slag Cement?, ?Steel Slag Road Cement? in China, as well as a driving force to the works of steel slag utilization with high-value addition, circular economy, energy conservation and discharge reduction in the iron and steel industry.