Concrete is the result of a mixture of cement, aggregate and water. Under certain conditions, the concrete mixture can be added with additives and admixture to get the concrete as needed. Cement is the most important material in the manufacture of conventional concrete. When cement is produced, the same amount of CO2 will also be generated as a side effect and pollute the atmosphere. Fly ash as an alternative to cement will be introduced as an alternative concrete material to reduce the use of cement in the concrete mix. In addition to the use of charcoal fly ash as a partial substitute for cement, this study also uses palm oil clinkers as a substitute for fine aggregate as much as 20%. This replacement material is an industrial waste which has the main content of silica and alumina which is similar to the main material for forming concrete. In addition, the use of these two materials also aims to reduce the exploration of the use of natural materials. This research introduces 3 kinds of concrete composition. The grouping is based on the ratio of fly ash and cement used, namely (60%:40%), (70%:30%) and (80%:20%). The test object used is a concrete cylinder with a diameter of 150 mm and a height of 300 mm. Tests were carried out at the age of 28 days of concrete. The compressive strength test showed that the best concrete was produced from the combination of the addition of 60% fly ash of coal aged 28 days, which was 4.21 MPa.
Penelitian ini dilakukan untuk mengkaji besarnya pendapatan dan profitabilitas agribisnis usaha jagal sapi di Rumah Potong Hewan Kota Kendari. Penetapan responden menggunakan metode sensus sebanyak 13 orang pejagal. Data dikumpulkan dengan cara wawancara menggunakan alat bantu kuesioner terhadap responden, yang dilaksanakan bulan Oktober 2016. Data yang terkumpul selanjutnya ditabulasi, dianalisis secara kualitatif dan kuantitatif. Hasil penelitian menunjukan bahwa sapi yang dipotong setiap bulan sebanyak 480/bulan atau 37 ekor/ pejagal yang menghasilkan daging sebanyak 31.600/bulan atau 2.430,8 kg/ pejagal. Rata-rata pendapatan pejagal setiap bulan adalah Rp.36.552.840 dengan nilai profitabilitas yaitu 17,73% yang menunjukan mempunyai prospek yang baik dengan perolehan nilai profitabilitas lebih tinggi dibanding tingkat suku bunga bank yang berlaku. Kata kunci: Profitabilitas, Pendapatan, Usaha jagal, Ternak sapi, dan RPH
Scouring that occurs in cross-section a river can be caused by morphological conditions of the river and the effect of bridge piers that obstruct the flow. Availability of piers and abutments can cause the stability of soil base granules to be disrupted, downflow, and horseshoe vortex that causes soil base granules around the bridge pier to be transported the flow that causes occurrence in local scouring. The problems of local scours also occurred in Krueng Ineng river, Alue Buloh Village, Nagan Raya Regency. Local scours on the bridge piers will cause a structural collapse which has the impact of decreasing the stability of the bridge structure currently. In this study, local scour analysis are using empirical equations with the Froehlich, Lacey and Colorado State University Method. The Results of the analysis with used the peak discharge (Qp100) that occurs in the Krueng Seunagan watershed is 1513m3/sec. Analysis with a flow depth of 3.06m, Froude number 0.29, pier width with lenticular shaped 4m, and D50, D95 (average grain size analysis ) 0.91mm and 4.35mm, show a maximum scour depth at the field of 1.65m and 1.68m occurs in point (station) 2 and 3 on segment 5. Analysis with the Froehlich, Lacey Method and the CSU Method shows a scour depth is 1.68m, 4,47m (Qp100) and 2.43m. The closest measurement result in the field is the Froehlich Method. With this result, it will be input for local governments to plan appropriate handling for minimizing local scour in this study area.
Tebing sungai merupakan salah satu bagian yang paling rentan mengalami pengikisan oleh aliran air apabila tidak diberi pengamanan tebing yang baik. Pembangunan dinding penahan pinggir sungai merupakan salah satu upaya untuk mencegah erosi, selain itu juga untuk menambah estetika. Memperkenalkan cara membuat penahan erosi tebing sungai tipe hexagonal sebagai wadah penanaman rumput vetiver dalam penerapan konsep bangunan hijau pada kelompok masyarakat Desa Alue Buloh, Kabupaten Nagan Raya. Salah satu upaya pengabdian berbasis riset, berdasarkan kondisi permasalahan di atas konsep dasar yang ditawarkan adalah penanganan tebing sungai dengan konsep Grey and Green Construction in Collaboration yang merupakan gabungan antara bangunan pelindung tebing sungai dari beton dan tumbuhan/vegetasi yaitu jenis rumput vetiver. Metode bangunan hijau yang diterapkan adalah dengan cara membuat penahan tebing seperti pot yang dapat menjadi wadah penanaman rumput vetiver. Sehingga gabungan antara bangunan pelindung tebing sungai dari beton dan tumbuhan/vegetasi yaitu jenis rumput vetiver dapat mengatasi laju erosi sungai dengan konsep bangunan hijau. Penerapan bangunan hijau ini dilakukan secara tepat guna dengan mengupayakan penggunaan biaya yang cukup murah serta efisien, tapi tetap memiliki manfaat yang sangat besar dalam penanggulangan erosi tebing sungai, sebagai upaya dalam manjaga ekosistem alam, mengurangi laju erosi tebing sungai dan peningkatan perekonomian masyarakat.
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