Ngijo Village is a village in the Tasikmadu sub-district, Karanganyar Regency, Central Java. If seen from its location in Ngijo Village, most of the area has drainage channels that are still open. This makes the road conditions in Ngijo Village relatively narrow because the open drainage channels reduce the area of the road. As a result, it will disrupt the mobility of community activities and be dangerous when it rains due to rising water levels in the drainage canals.To overcome the problems in Ngijo Village, the researchers aim to make a canal cover deck. The drain cover deckers are made of eco-friendly concrete. Eco-friendly concrete is concrete composed of materials that do not damage the environment with added materials utilizing mask waste and plastic bottle waste. The method used in this community service is the preparation stage for the location of Ngijo village, the implementation stage by conducting direct socialization to the community about how to make deckers from eco-friendly concrete and the evaluation stage for the procurement of canal deckers. The results of this activity show that after the construction of deckers and the application of drainage channels it has a positive impact. The positive impact for the road in Ngijo Village is to be wider because it is not obstructed by the drainage channels which were originally open and the drainage channels are still functioning properly and will increase the mobility of community activities. applied to other products that can provide benefits to the environment. Another benefit is that the community is given insight that will add to their understanding and opinions which will create business opportunities in Ngijo Village.
Terdapat beberapa wilayah di Indonesia yang kekurangan persediaan air untuk kebutuhan irigasi akibat pengaruh iklim, sehingga beberapa di antaranya sering kali mengalami gagal panen karena kekurangan air. Salah satu wilayah yang mengalami masalah tersebut adalah Kabupaten Situbondo. Hal ini dapat disebabkan karena jumlah debit yang keluar dari intake tidak mampu memenuhi seluruh kebutuhan air di petak sawah. Kurniawan (2020) sebelumnya sudah melakukan penelitian analisis fase tanam menggunakan algoritma NDVI pada citra Sentinel 2. Namun proses pengolahan data pada penelitian tersebut membutuhkan kemampuan perangkat pengolah data yang tinggi dan membutuhkan ruang penyimpanan data yang besar sehingga membutuhkan waktu lebih lama pula dalam pemrosesan datanya. Pada penelitian kali ini, peneliti akan menggunakan perangkat pengolah citra berbasis Cloud yaitu Google Earth Engine dimana pemrosesan dan penyimpanan data dilakukan pada jaringan internet. Penelitian ini menggunakan indeks vegetasi NDVI dari Citra Sentinel 2 sebagai instrumen untuk mengidentifikasi fase tanam padi dan membuat peta distribusi fase tanam sebagai pedoman untuk menghitung kebutuhan air di petak-petak tersier D.I. Sampean. Nilai NDVI tertinggi terjadi pada tanggal 26 Januari 2019 yaitu Fase Tanam Mid-Season Stage 1 dengan luas sawah 756.91 Ha dan nilai NDVI terendah didapat pada akhir fase tanam tanggal 11 Maret 2020 dengan luas sawah 489.09 Ha. Hasil klasifikasi terbimbing menggunakan metode Machine Learning Random Forest memberikan akurasi yang sangat baik dengan nilai OA 100% dan kappa sebesar 1 pada citra akuisisi 12 Desember 2019. Debit kebutuhan irigasi tertinggi terjadi pada tanggal 25 Februari 2020 sebesar 253.20 lt/dt dan debit kebutuhan air irigasi terendah terjadi pada tanggal 11 Maret yang bertepatan dengan masa panen. Berdasarkan hasil perhitungan peneliti, kebutuhan air irigasi pada bulan Desember hingga bulan Januari sudah terpenuhi oleh curah hujan yang terjadi di wilayah UPT Pengairan Situbondo sehingga tidak membutuhkan debit irigasi dari saluran irigasi.
Eco-friendly concrete uses less waste material which has less negative impact on the environment. This research utilizes PET plastic bottles and masks as a substitute for aggregate in concrete. The aim is to find out whether the compressive strength of eco-friendly concrete meets the requirements of structural concrete. The method used is planning mix design on seven samples, one sample of normal concrete and six samples of concrete with replacement of aggregate composition. Samples with aggregate replacement were designed from variations of 0.1%, 0.2% and 0.3% by weight of cement and PET plastic bottles with composition variations of 5% and 10% of coarse aggregate. The test results of the average compressive strength of concrete for 28 days are 235 KN/m2 for normal concrete; 117 KN/m2, 85 KN/m2; 149 KN/m2; 64 KN/m2, 42 KN/m2 and 21 KN/m2. The highest average compressive strength was obtained at 149 KN/m2 but did not reach the design compressive strength of 235 KN/m2. It can be concluded that the use of substitute aggregates from PET plastic bottles and masks did not get concrete results that match the compressive strength of the plan, but the concrete still meets the requirements for the compressive strength of low-strength structural concrete.
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