ABSTRAK: Data debit biasanya tersedia lebih sedikit dibandingkan data curah hujan, sehingga perlu dicari suatu hubungan antara aliran sungai yang diterapkan dalam periode tersedia data curah hujan di suatu wilayah DAS. Tujuan dari studi ini adalah untuk mengetahui kesesuaian metode berdasarkan analisis validasi data antara debit pengamatan dengan debit model. Metode yang dilakukan dengan pemodelan debit berdasarkan curah hujan dengan model Artificial Neural Network (ANN) program MATLAB R2014b. Sub DAS Brantas Hulu digunakan sebagai studi kasus karena sering mengalami permasalahan limpasan. Validasi dari metode ANN diuji dengan Root Mean Square Error (RMSE), Nash-Sutcliffe Efficiency (NSE), Koefisien Korelasi (R) dan Kesalahan Relatif (KR). Dari hasil kalibrasi menggunakan Model ANN diperoleh data yang paling baik terdapat pada data lima tahun epoch 500. Hasil verifikasi berdasarkan nilai R mempunyai hubungan yang relatif baik antara debit pengamatan dengan debit model. Hasil validasi menunjukkan kevalidan pada data satu tahun epoch 500.Kata kunci: limpasan, model artifical neural network (ANN), uji nash sutchlife efficient (NSE), koefisien korelasi (R). ABSTRACT:Discharge data is usually less available than rainfall data, so it is necessary to find a relationship between river flows that are applied in the period available rainfall data in a watershed area. The purpose of this study is to determine the suitability of the method based on the analysis of data validation between the observed discharge and the model discharge. The method is done by modeling the discharge based on rainfall with the Artificial Neural Network (ANN) MATLAB R2014b program. The Upper Brantas Watershed is used as a case study because it often has runoff problems. Validation of the ANN method was tested with Root Mean Square Error (RMSE), Nash-Sutcliffe Efficiency (NSE), Correlation Coefficient (R) and Relative Error (KR). From the results of calibration using the ANN Model, the best data is found in the five years data of epoch 500. Verification results based on the value of R have a relatively good relationship between observation discharges with model discharges. The validation results show the validity in a year data of epoch 500.
Early age compressive strength, porosity, and sorptivity of concrete using peat water to produce and cure concrete AIP Conference Proceedings 1887, 020027 (2017) Abstract. The performance of porous concrete made of recycled coarse aggregate was investigated. Fly ash was used as cement partial replacement. In this study, the strength of recycled aggregate was coMPared to low quality natural coarse aggregate which has high water absorption. Compression strength and tensile splitting strength test were conducted to evaluate the performance of porous concrete using fly ash as cement replacement. Results have shown that the utilization of recycled coarse aggregate up to 75% to replace low quality natural coarse aggregate with high water absorption increases compressive strength and splitting tensile strength of porous concrete. Using fly ash up to 25% as cement replacement improves compressive strength and splitting tensile strength of porous concrete.
Pervious concrete is a type of pavement made with minimal fine aggregate and high void ratio that allows stormwater to infiltrate into the soil and overcomes surface runoff problems. In this paper, the utilization of fly ash as supplementary cementitious material to the mechanical properties of pervious concrete made with recycled aggregate was investigated. Recycled aggregate was reclaimed from concrete waste to make pervious concrete. 0%, 50%, and 100% of recycled aggregate were used to replace natural coarse aggregate; while 0%, 15% and 25% of fly ash were used as cement replacement. The mechanical properties of pervious concrete were evaluated by determining the compressive strength, splitting tensile strength and flexural strength at 28 days. The results revealed that the use of recycled aggregate significantly affected the strength of pervious concrete. Further, the experimental results show that fly ash as supplementary cementitious material improved the compressive strength, splitting tensile strength and flexural strength of pervious concrete.
The use of concrete waste from the demolition of buildings is one of the conservation efforts to reduce its environmental impact. In this study, concrete waste was destroyed by the size of coarse aggregates, then made into porous concrete. Porous concrete from recycled coarse aggregate was used as filtration media to reduce the pollutants in wastewater to satisfy the water quality standards. For this purpose, wastewater from the communal wastewater treatment plant was filtrated through two layers of porous concrete made of recycled coarse aggregate with several different sizes, and the water quality output of the system was measured according to water quality parameter standard. The objective of this study is to examine the effectiveness of the aggregate sizes of normal coarse aggregate compared to recycled coarse aggregate as filtration media. From the result of the water treatment filtration model, it was found that the size of coarse aggregate in the porous concrete mix has a significant effect for reducing the water pollutants, as biological oxygen demand (BOD), chemical oxygen demand (COD) and total suspended solids (TSS). As a result of this study, porous concrete made from recycled coarse aggregate shows better performance on filtrating the water pollutants.
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