Article history: Received : Revised: Accepted: *Corresponding Author: I Dewa Gede Jaya Negara. Jurusan Teknik Sipil, Fakultas Teknik Universitas Mataram, Mataram, Indonesia; Email: jayanegara@unram.ac.id Abstrak: Air merupakan kebutuhan bagi semua mahluk hidup dimuka bumi ini, dan jika terjadi terbatasnya keberadaan air apa lagi pada lahan kering maka akan dapat membatasi segala aktifitas kehidupan yang ada disekitarnya. Demikian halnya yang ada di wilayah Kabupaten Lombok Utara yaitu di Wilayah Tampes, keberadaan sumber air permukaan hanya terdapat dibeberapa lokasi saja dengan potensi air sangat minim, sementara sumber air yang ada tidak dimanfaatkan untuk pertanian sehingga lahan kering yang ada tidak dapat diusahatanikan atau nganggur. Adanya potensi air disekitar permukiman ternyata belum mampu dimanfaatkan untuk memberikan nilai ekonomi oleh warga sekitar, karena terbatasnya pengetahuan masyarakat. Untuk mengantisipasi adanya perubahan iklim global, yang berdampak pada ketersediaan air yang akan semakin menurun, maka warga di wilayah ini kering harus disiapkan dengan cara memberikan penyuluhan-penyuluhan. Masyarakat harus mendapatkan wawasan tentang hal tersebut, dan agar masyarakat naninya mampu menjalin komunikasi dengan fihak-fihak lain yang terkait untuk membantu kesulitan yang dihadapinya. Pengabdian ini dilakukan dengan mengadakan sosialisasi Tentang Pentingnya sumberdaya air dan lahan kering untuk meningkatkan ekonomi keluarga, sosialisasi dilakukan pada tingkat lapang dengan melibatkan tokoh masyarakat dan warga sekitar sungai. Sasaran pengabdian adalah masyarakat yang bermukim di sekitar sungai di dusun Tampes dan tokoh masyarakat. Tujuan sosialisai ini adalah untuk meningkatkan pengetahuan masyarakat tentang pemanfaatan sumber air dan lahan kering untuk pertanian. Soaialisasi dilakukan dengan urutan kegiatan survey awal, tinjauan lapangan, ceramah dan diskusi, yang dilakukan ditingkat lapang dengan masyarakat. Hasil yang dicapai adalah warga sekitar sungai telah mendapatkan pengetahuan tentang manfaat air sungai yang ada dan memahami cara memanfaatkannya, mampu membuat ide-ide yang diusulkan ke desa untuk dijadikan program desa.
The advantages of using self-compacting concrete (SCC) are reducing the time of construction and the number of employments, reducing noise that can disturb the surrounding environment, and increasing the density of hardened concrete structural elements, automatically affecting bond strength reinforcement in SCC. The bond strength is a parameter as an essential factor affecting the behavior of reinforced concrete. In this manuscript, the Adaptive Neuro-Fuzzy Inference System (ANFIS) model was built to predict the bond strength in SCC. For showing the performance of the ANFIS model, the level of accuracy-based correlation coefficient (R 2 ) and Root Mean Square Error (RMSE) were determined. Learning process data consists of input and output. The input in this study includes compressive strength of concrete (f' c ), the diameter of steel reinforcement (d b ), and development of length (L d ), while the output bond strength (τ). The results of the proposed model were in good agreement with the experimental results, as evidenced by an R 2 of 0.71 and an RMSE of 3.31 MPa in the testing data, indicating that the proposed ANFIS model is capable of accurately predicting steel reinforcement bond strength in SCC.
The self-weight of the concrete slab in high-rise building construction significantly affects the risk of structural failure in earthquake-prone areas as the earthquake force is directly proportional to the mass of the building. To reduce the building mass then the sandwich concrete slab is introduced. This study focuses on variations of aspect ratio effect on the slab behavior under central point loading. The aspect ratios are set at 1.0, 1.26, 1.5, and 2.0. A normal concrete slab with an aspect ratio of 1 as the control specimen is prepared. Tension reinforcement of D10-150 is placed in both x-and y-direction. While the compression reinforcement of P8-200 for both directions is used. The slabs were supported on four edges and tested under a central point load. Results found that the slab with an aspect ratio of 2.0 has a greater stiffness than other slabs as well as the resistance load capacity. The slab with an aspect ratio less than 2.0 behaves similarly with no significant differences. Generally, the slab ductility index decreases with increasing the aspect ratio. All slabs have ductile behavior which is indicated by both the strain measurement and the relationship of the load-deflection curves. An aspect ratio of 2.0 as the limit used by the Standard for distinguishing one-way and two-way slab elements is proven valid and acceptable.
Development in the construction sector continues to increase. The most common building material nowadays is concrete. Although normal concrete is often is being used, at this time high strength concrete and lightweight concrete have also been widely used in construction. In the codes for concrete materials, either SNI 03-6805-2002 or PBI NI-2 1971, it is stated about the assessment factor of compressive strength development for normal concrete according to the age of the concrete. However, these codes have not accommodated the assessment factor for high-strength and lightweight concrete. An experimental approach was used to determine the assessment factor and is discussed in this paper. The specimens were cylinders of high strength concrete, normal concrete, and lightweight concrete and tested for compressive strength after curing times of 3, 7, 14, 21, 28 days, 56, and 90 days. According to the experimental result, it presents that the concrete compressive strength increases with the increasing of concrete age. The assessment factor for the development of compressive strength of high-strength concrete shows the highest value, while lightweight concrete provides the lowest factor. The assessment factors of compressive strength development for normal concrete lie in between the values given in PBI NI-2 1971 and SNI 03-6805-2002. Meanwhile, the assessment factors stated in SNI 03-6805-2002 retains the highest value.
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