To obtain a good quality concrete asphalt, in the process of planning a mixture must consider the characteristics of a concrete asphalt mixture including durability which is the resistance of the asphalt mixture to the effects of weather, water, temperature changes, as well as wear due to vehicle wheel friction. Sugar palm fibres are many and easy to obtain because they come from agriculture. Sugar palm fibres have durable nature and are not easy to rot either in an open state (resistant to weather) or embedded in the soil. In this study, we will examine the effect of adding sugar palm fibres to the durability of the Laston AC-WC mixture, and sugar palm fibres as an addition to the binding of asphalt to the aggregate. The method used in this study is the Marshall method. The results showed that the durability of the mixture with 2% fibres added ingredients was still stronger than those using 1.5% so that the use of sugar palm fibres added in the Laston AC-WC mixture would help the durability of the mixture because the cavities in the mixture were getting smaller, so it was more waterproof, also the bond between aggregates which is the stability of the mixture can be maintained while maintaining the flexibility of the mixture. While the Marshall Immersion test results obtained strong mixture durability if the use of sugar palm fibres as added 2% in the mixture.
AbstrakWilayah Indonesia yang berada pada belahan dunia yang memiliki iklim hujan tropis menyebabkan bervariasinya intensitas curah hujan. Intensitas curah hujan akan sangat berpengaruh pada kestabilan tanah sebagai dasar pondasi sebuah struktur sipil. Dalam penelitian ini ditinjau pengaruh intensitas curah hujan dan kemiringan lereng dalam upaya pencegahan kerusakan struktur maupun kejadian bencana yang dapat ditimbulkan. Dilakukan pengujian laboratorium dengan menggunakan metode pembanding Universal Soil Loss Equation untuk menentukan besarnya erosi yang terjadi pada lereng tanah dengan kadar organik 18,67% dengan tingkat kepadatan 60% dan 70%. Dengan menggunakan Rainfall Simulator digunakan variasi intensitas hujan 23 mm/jam, 34 mm/jam dan 51 mm/jam diperoleh peningkatan nilai erosi tanah sebesar 40% dari intensitas tertinggi ke intensitas terendah. Dari faktor kemiringan lereng dimodelkan kemiringan 10 o , 15 o dan 20 o dan didapatkan hasil peningkatan nilai erosi sebesar 3%. Abstract The Effect of Rainfally and Land Slope to Erosion which Could Cause A Landslide.Indonesian region is located on tropical rain forest territory on earth causes variations of high intensity of rainfall. The intensity of rainfall will great ly affect the stability of soils as a foundation ground of a civil structure. In this study reviewed the influence of rainfall intensity and slope in the prevention of structural damage or catastrophic events that may occur. Experimental research conduct using comparison method Universal Soil Loss equation to determine the amount of erosion on the slope of ground with organic content of 18.67 with a density of 60% and 70%. Rainfall simulator used to set variations of rainfall intensity by 23 mm/hour, 34 mm/hour and 51 mm/hour is obtained an increase in ground erosion by 40% from the highest intensity to the lowest intensity. From the slope factor, sample is modeled slope with 10 o , 15 o and 20 o and showed increase of erosion up to 3%. Kata-kunci:Erosi lereng, intensitas hujan, tanah organik .
The development of the densification pattern of suburban settlements is an increasingly interesting subject since it relates to urban development policies and the concept of a planning approach. The purpose of this study was to analyze; characteristics of spatial physical transformation, transformation to densification, and densification as process. The research method used was the qualitative descriptive method. The data were obtained by direct and indirect observation. The results showed the growth of planned and organic settlement densification patterns through the formation and development phases. The development phase is a process of the space function change from a residential area to a service and trade function. The development of densification patterns and spatial transformation of the residential area of Bumi Tamalanrea Permai was due to the land plot policy which has implications for the infilling development process. the area development process around the pattern development and transformation phases was influenced by the development of the BTP (central business district) as a growth center. This study recommends considering spatial transformation as a determinant of the growth of settlement densification patterns followed by future management policies for the settlement area of Bumi Tamalanrea Permai and its surrounding areas.
Tujuan dari penelitian ini adalah untuk mengetahui karakteristik agregat dari Sungai Bittuang, mengetahui komposisi campuran AC-WC dan mengetahui karateristik Marshall, Indeks Perendaman Sisa pada Campuran AC-WC. Metodologi dalam penelitian ini adalah melakukan serangkaian pengujian karakteristik berupa agregat kasar, agregat halus, filler dan aspal lalu merancang komposisi campuran kemudian membuat benda uji berupa campuran AC-WC serta pengujian Marshall Konvensional. Hasil penelitian menunjukkan bahwa Karakteristik agregat yang berasal dari Sungai Bittuang Kabupaten Tana Toraja, untuk Campuran AC-WC memenuhi spesifikasi yang diisyaratkan dalam standar Bina Marga 2018. Berdasarkan hasil rancangan komposisi pada campuran AC-WC yang menggunakan agregat Sungai Bittuang, adalah dengan agregat kasar 36,90%, agregat halus 50,30%, filler 5,80%, dengan kadar aspal optimum 7,00%. Hasil pengujian karakteristik campuran AC-WC melalui pengujian pada Marshall konvensional diperoleh karakteristik campuran beraspal yang memenuhi spesifikasi yaitu stabilitas, flow, VIM, dan VFB, sedangkan untuk VMA tidak memenuhi syarat spesifikasi pada kadar aspal 5.00%. Sementara Hasil uji Marshall Immersion (Indeks Kekuatan Sisa) pada campuran Laston AC-WC yang menggunakan agregat Sungai Bittuang Kecamatan Bittuang Kabupaten Tana Toraja memenuhi Spesifikasi Umum Bina Marga 2018, yaitu 95,03% > 90 %.
Raw water treatment commonly uses effective coagulants with the purpose to reduce the concentration of particles causing turbidity. One of the most popular coagulants is poly aluminum chloride (PAC) with some advantages. It has low corrosiveness. Formed floccules are relatively easier to detach and pH result is in moderate level. Another alternative chemical substance as a coagulant is Chitosan, a high degradability, non-toxic substance, with high market availability. Chitosan usage produces small amount of sludge and no cationic residue. This research intended to analyze the comparison of effectiveness of PAC and chitosan as coagulants for raw water treatment in Jeneberang River. Samples were taken in two locations; at the long storage (first location) and at the ground sill (second location) in Jeneberang River. Samples were analysed at Water Quality Laboratory of Environmental Engineering Department, Engineering Faculty, Hasanuddin University. For first location, PAC has 94.57% effectiveness to reduce turbidity when compared to as for chitosan which gained 69.67% effectiveness in reducing turbidity. Therefore, the results show that PAC is more effective and efficient as a coagulant for raw water treatment in Jeneberang River when compared to Chitosan.
Perubahan tutupan lahan yang terjadi berdampak pada kondisi hidrologi disuatu DAS. Kondisi hidrologi yang dimaksud dengan besaran keluaran DAS adalah debit yang menggambarkan besaran air. Penelitian ini bertujuan untuk mengetahui pengaruh perubahan tutupan lahan terhadap aliran sungai di DAS Pangkajene. Data dianalisis dengan menggunakan analisis hidrologi dan perubahan tata guna lahan. Hasil penelitian menunjukkan bahwa terjadi peningkatan debit banjir rancangan sebesar ±18,83 m³/det pada masing-masing kala ulang. Perubahan tata guna lahan yang terjadi adalah luas area sawah, tambak, dan pemukiman bertambah sedangkan luas area hutan menjadi berkurang. Meningkatnya nilai debit banjir tidak signifikan dikarenakan perubahan tata guna lahan juga tidak berubah cukup banyak.
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