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JURNAL SAINTIS
Published by Universitas Islam Riau
ISSN : 14107783     EISSN : 25807110     DOI : -
Core Subject : Social, Engineering,
Civil Engineering, Building, Construction & Architecture Engineering Environmental Science
Saintis is devoted to research on civil engineering related fields including geotechnics, transports, structures, water resources and others related with civil engineering topics.
Arjuna Subject : -
Articles 5 Documents
 1 
Search results for , issue "Vol. 23 No. 01 (2023)" : 5 Documents clear
Pengaruh Pandemi Covid-19 Terhadap Produktivitas Pekerjaan Konstruksi di Pekanbaru: The Influence of The Covid-19 Pandemic on Construction Productivity in Pekanbaru Qorina Adhisty; Sapitri
JURNAL SAINTIS Vol. 23 No. 01 (2023)
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/saintis.2023.vol23(01).17745

Abstract

[ID] Pandemi Covid-19 di Indonesia memberikan pengaruh yang signifikan bagi industri konstruksi. Pertumbuhan nilai indeks konstruksi mengalami penurunan pada tahun 2020. Ini disebabkan banyaknya permasalahan yang dihadapi oleh proyek, mulai dari pengalihan anggaran untuk penanganan Covid-19, keterbatasan sumber daya dan keadaan lainnya. Oleh karena itu, diperlukan strategi untuk menghadapi dampak yang ditimbulkan yang dinilai mampu menurunkan produktivitas pekerjaan konstruksi.  Penelitian ini dilakukan untuk mengetahui pengaruh pandemi Covid-19 terhadap produktivitas pekerjaan konstruksi di Kota Pekanbaru. Metode penelitian yang digunakan adalah metode kualitatif dengan mengumpulkan data primer dari kuesioner yang disebarkan kepada 32 target responden yang berlatar belakang sebagai konsultan dan kontraktor proyek konstruksi. Pengolahan dan analisa data dilakukan menggunakan software Smart PLS untuk menguji validitas, reliabilitas, uji model struktural dan uji hipotesis. Hasil analisis menunjukkan uji validitas 11 dari 15 indikator dengan 4 variabel dinyatan valid, uji reliabilitas menunjukkan semua variabel memiliki tingkat keandalan yang tinggi, dan uji hipotesis menunjukkan bahwa H1, H2 dan H3 dapat diterima. Sehingga diperoleh kesimpulan bahwa pekerjaan konstruksi pada masa pandemi Covid-19 mengalami penurunan produktivitas sebesar 64% yang masing-masing disebabkan oleh bahan material sebesar 39,8%, perencanaan dan penjadwalan sebesar 19,4%, dan manajemen sebesar 27%. [EN] The Covid-19 pandemic in Indonesia has had a significant impact on the construction industry. The construction index value decreased in 2020. This is due to the many problems faced by the project, starting from budget diversion for handling Covid-19, limited resources and other circumstances. Therefore, strategies are needed to deal with the impacts which are considered capable of reducing the productivity of construction work. This research was conducted to determine the effect of the Covid-19 pandemic on the productivity of construction work in Pekanbaru. The research method used was a qualitative method by collecting primary data from questionnaires distributed to 32 target respondents with backgrounds as consultants and contractors on construction projects. Data processing and analysis were carried out using Smart PLS software to test validity, reliability, structural model testing and hypothesis testing. The results of the analysis show that the validity test of 11 out of 15 indicators with 4 variables is found to be valid, the reliability test shows that all variables have a high level of reliability, and the hypothesis test shows that H1, H2 and H3 are acceptable. So it was concluded that construction work during the Covid-19 pandemic experienced a decline in productivity of 64%, each of which was caused by materials by 39.8%, planning and scheduling by 19.4%, and management by 27%.
Evaluasi Kinerja Breakwater Terhadap Gelombang di Pantai Tanjung Medang Kecamatan Rangsang Kabupaten Kepulauan Meranti: Evaluation of Breakwater Performance Against Waves At Tanjung Medang Beach, Rangsang District, Meranti Islands Regency Azima, Fauzan; Harmiyati; Agus, Firdaus; Zaenal Muttaqin, Muchammad
JURNAL SAINTIS Vol. 23 No. 01 (2023)
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/saintis.2023.vol23(01).25225

Abstract

[IN] Pantai Tanjung Medang di Kabupaten Kepulauan Meranti mengalami abrasi dan kerusakan akibat gelombang besar, mengancam pemukiman dan pelabuhan. Untuk mengatasinya, dibangun pemecah ombak (breakwater). Namun, seiring waktu dan kenaikan muka air laut, kinerja breakwater dinilai tidak lagi maksimal, terutama saat pasang besar. Penelitian ini bertujuan mengevaluasi kinerja breakwater eksisting dengan menganalisis karakteristik gelombang. Metode yang digunakan adalah hindcasting gelombang berdasarkan data angin 10 tahun dari BMKG Tanjung Balai Karimun untuk mendapatkan tinggi, periode, dan transformasi gelombang. Analisis dilanjutkan dengan penentuan elevasi muka air laut menggunakan metode Admiralty, serta analisis run-up dan overtopping gelombang. Hasil analisis menunjukkan bahwa gelombang dominan berasal dari arah timur laut dengan ketinggian di atas 1 m, menjadikannya gelombang destruktif. Pada kondisi muka air tertinggi (HHWL), breakwater setinggi 3 m mengalami overtopping dari berbagai arah (nilai run-up tertinggi 2,25 m dari utara), sehingga tidak sepenuhnya aman meskipun masih efektif memecah gelombang. Sementara itu, breakwater setinggi 1,6 m sudah tidak efektif dalam mereduksi energi gelombang yang datang. [EN] Tanjung Medang Beach in Meranti Islands Regency has experienced abrasion and damage from large waves, threatening settlements and the local port. A breakwater was built to mitigate this issue. However, over time, due to changing natural conditions and rising sea levels, its performance is considered suboptimal, especially during high tides. This study evaluates the existing breakwater's performance by analyzing wave characteristics. The method involves wave hindcasting based on 10 years of wind data from BMKG Tanjung Balai Karimun to determine wave height, period, and transformation. The analysis is supplemented by determining the sea level elevation using the Admiralty method, followed by a run-up and overtopping analysis. The results indicate that the dominant waves come from the northeast with heights exceeding 1 m, classifying them as destructive waves. At the highest water level (HHWL), the 3 m high breakwater experiences overtopping from various directions (with the highest run-up value of 2.25 m from the north), rendering it not entirely safe, although it remains effective at breaking incoming waves. Meanwhile, the 1.6 m high breakwater is no longer effective in reducing wave energy.
Evaluasi Neraca Air Pada Irigasi Kuok II: Water Balance Evaluation In Kuok II Irrigation Aferta, M Ferdi; Agus, Firdaus; Adriati, Yolly; Harmiyati
JURNAL SAINTIS Vol. 23 No. 01 (2023)
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/saintis.2023.vol23(01).25231

Abstract

[IN] Daerah irigasi kuok II memiliki luas sawah sekitar 200 hektar, sumber air irigasinya di supplay dari sungai irigasi kuok II. Permasalahan ketersediaan air didaerah irigasi ini berdasarkan pra penelitian dilapangan terindikasi kekurangan ketersediaan air, dimana lahan yang dapat diairi hanya 50% pada saat musim kemarau hal ini disebabkan menyusut nya debit air disungai irigasi Kuok II..Perhitungan neraca air ini digunakan untuk mengevaluasi ketersediaan air serta menentukan kondisi suatu daerah mengalami defisit atau surplus. Analisa dilakukan dari data sekunder yaitu analisa hidrologi hujan rata-rata daerah. Setelah itu dilakukan perhitungan analisa evapotranspirasi menggunakan pendekatan penman, dan Metode Thornwhaite & Mather. Daerah Irigasi (D,I) Kuok II terdiri dari 215,71 hektar sawah potensial, dengan perkiraan kebutuhan air sebanyak 244,59 l/hari, Kebutuhan air irigasi di hitung selama masa persiapan lahan dimana Nilai IR tertingggi terjadi pada bulan Maret periode II yaitu, 470,71 l/det/ha, kebutuhan air irigasi paling sedekit terjadi pada bulan Januari periode 1 yaitu, 12,65l /det/ha, Sedangkan ketersediaaan debit air pada irigasi Kuok II berdasarkan perhitungan Run Off, mampu memenuhi kebutuhan dengan total ketersediaan sebesar 851,94 l/dt, Besarnya perbedaan antara kebutuhan air di sawah dengan ketersediaan air disumber irigasi 381,23 l/dt. Dari hasil analisa perhitungan kebutuhan dan ketersediaan air irigasi didapatkan hasil bahwa ketersediaan air pada Daerah Irigasi Kuok II mampu mencukupi kebutuhan air untuk persawahan. Hal ini didasarkan pada besar nya nilai Run Off pada periode 2010-2020, perkiraan kebutuhan air 244,59 l/hari dan ketersediaan debit air pada irigasi Kuok II berdasarkan perhitungan RUN Off sebesar 851,94 l/hari. [EN] The Kuok II Irrigation Area, covering approximately 200 hectares of rice fields, depends on water from the Kuok II irrigation river. Preliminary field observations indicated limited water availability, particularly during the dry season, when only about half of the land could be irrigated due to reduced river discharge. To assess this condition, a water balance analysis was conducted using secondary hydrological data, including rainfall analysis, evapotranspiration estimation with the Penman approach, and the Thornthwaite & Mather method. These methods are widely used in irrigation studies to determine crop water demand and evaluate the balance between supply and requirement. The Kuok II Irrigation Area (D.I) has a potential of 215.71 hectares of rice fields with an estimated daily water requirement of 244.59 liters. The analysis shows that irrigation needs vary throughout the year at 470.71 l/sec/ha during land preparation, while the lowest occurs in January (Period I) at only 12.65 l/sec/ha. Runoff analysis based on data from 2010–2020 indicated that the available water discharge in the Kuok II irrigation river reaches 851.94 l/sec, which exceeds the irrigation demand by 381.23 l/sec. These results suggest that despite seasonal fluctuations, the overall availability of irrigation water is sufficient to meet the needs in the Kuok II area. In conclusion, the integration of rainfall data, evapotranspiration estimation, and water balance calculations demonstrates that water resources in the Kuok II Irrigation Area are adequate to support sustainable rice cultivation, while emphasizing the need for continuous monitoring to maintain efficient and effective water management.
Evaluasi Kekuatan Struktur Kolom Dengan Pendekatan Probabilitas Gaussian Pada Gedung Kuliah Terpadu Politeknik Negeri Bengkalis: Evaluation of The Strength of Column Structure Using a Gaussian Probability Approach on Gedung Kuliah Terpadu Politeknik Negeri Bengkalis Sukmawati , Mega; Kurniawan, Mahadi; Anggreana, Vella; Sapitri
JURNAL SAINTIS Vol. 23 No. 01 (2023)
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/saintis.2023.vol23(01).25233

Abstract

[IN] Gedung Kuliah Terpadu (GKT) 1 Politeknik Negeri Bengkalis direncanakan 3 lantai dengan bentuk asimetris dan berfungsi sebagai gedung administrasi dan laboratorium, dengan kondisi wilayah Bengkalis yang berpotensi gempa sangat kecil. Berdasarkan hal tersebut, pada GKT 1 dilakukan evaluasi pada struktur kolom dengan asumsi bahwa di daerah Bengkalis terjadi peningkatan percepatan tanah puncak atau (Peak Ground Acceleration, PGA) menurut SNI 1726-2019. Tujuan penelitian ini untuk mengetahui apakah keandalan struktur kolom yang direncanakan stabil dari pengaruh nilai tekuk dalam menahan beban aksial maksimum yang bekerja, akibat peningkatan percepatan tanah puncak atau (Peak Ground Acceleration, PGA). Metode yang digunakan adalah metode probabilitas distribusi normal (Gaussian), yang dapat menentukan keandalan struktur kolom dalam menahan beban kerja maksimum akibat peningkatan percepatan tanah puncak atau (Peak Ground Acceleration, PGA) yang dilakukan pada GKT 1. Dengan struktur kolom yang ditinjau yaitu C27, yang merupakan kolom kritis dengan beban aksial paling maksimum (Pmaks) yang diterima. Hasil evaluasi pada kolom kritis C27, beban aksial maksimum 109,044 ton menghasilkan nilai tekuk sebesar 95,0488 mˉ² dengan keandalan 99,8% berdasarkan kondisi eksisting dilapangan, sedangkan untuk beban aksial maksimum 155,040 ton setelah diasumsikan terjadinya percepatan tanah puncak (Peak Ground Acceleration, PGA) berdasarkan SNI 1726-2019 menghasilkan nilai tekuk 97,5715 mˉ² dengan keandalan sebesar 91,9 %. [EN] Gedung Kuliah Terpadu (GKT) 1 Politeknik Negeri Bengkalis is designed as a three-story building with an asymmetrical shape, functioning as an administrative and laboratory facility. Considering that Bengkalis is located in an area with very low earthquake potential, an evaluation was conducted on the column structure by assuming an increase in Peak Ground Acceleration (PGA) based on SNI 1726-2019. This study aims to determine whether the reliability of the designed column structure remains stable in resisting maximum axial loads when subjected to increased soil acceleration. The method applied in this research is the normal distribution probability (Gaussian) method, which is used to assess the reliability of the column structure in withstanding maximum loads resulting from the assumed increase in PGA. The structural analysis focuses on column C27, identified as the critical column due to receiving the highest axial load (Pmax). The evaluation results show that for column C27, the maximum axial load of 109.044 tons produces a bending value of 95.0488 mˉ² with a reliability of 99.8% under existing field conditions. However, when the maximum axial load increases to 155.040 tons—based on the assumed peak ground acceleration according to SNI 1726-2019—the bending value rises to 97.5715 mˉ², and the reliability decreases to 91.9%. These findings indicate that an increase in PGA significantly affects the reliability of the column structure, although it remains within the safe category.
Pengaruh Penambahan Admixture Adhesive Manufacturer 78 Terhadap Kuat Tekan Beton Dengan Metode Self Healing Concrete: The Effect of Additional Admixture Adhesive Manufacture 78 On The Concrete Compressive Strength Using the Self-Healing Concrete Method Hasyim, Nanda; Syarif, Firman; Kurniawan, Mahadi; Anggrena, Vella
JURNAL SAINTIS Vol. 23 No. 01 (2023)
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/saintis.2023.vol23(01).25239

Abstract

[IN] Penelitian ini menggunakan metode Self Healing Concrete yang dimana beton diharapkan mampu memperbaiki dirinya sendiri dari kerusakan retakan dengan memanfaatkan bakteri yang didapat dari ekstrak limbah sayuran. Untuk mengetahui peningkatan kekuatan beton setelah dicampur dengan bahan tambah limbah tomat dan Mastersure1007 additive dengan metode self healing concrete dengan variasi limbah sayuran 3%, dan 0,8% Mastersure 1007 dan Mengetahui pengaruh penambahan ekstrak limbah sayuran dan Mastersure 1007 pada beton dengan metode self healing concrete terhadap kuat tekan beton Penelitian ini bersifat eksperimen (reserch) yang dilakukan dilaboratorium dengan mengacu pada ISO 140440 dengan benda uji berbentuk silinder sebanyak 27 sampel. Dan akan dilakukan uji tekan. Hasil dari penelitian ini, kuat tekan beton tanpa diretakkan variasi 1% adhesive manufacturer 78 dan 3%, 5%, 7%, 9% limbah sayuran secara berturut-turut adalah 44,59 Mpa, 42,28 Mpa, 42,71 Mpa, 49,85 Mpa, 41,25 Mpa, sedangkan kuat tekan beton diretakkan variasi 3%, 5%, 7%, 9% secara berturut-turut adalah 36,85 Mpa, 38,02 Mpa, 42,16 Mpa, 44,68 Mpa. Nilai slump pada beton campuran 1% adhesive manufacturer 78 memiliki nilai 43 mm, pada beton variasi 3%, 5%, 7%, 9% secara berturut-turut adalah 44,33 mm, 45,66 mm, 48,33 mm, 53,66 mm, sedangkan beton diretakkan memiliki nilai slump variasi 3%, 5%, 7%, 9% secara berturut-turut adalah 48,66 mm, 47 mm, 44,33 mm, 42,66 mm. Pemulihan retakan pada beton yang dilihat secara visual dengan perawatan selama 28 hari, dapat menutup retakan yang berukuran sehelai rambut pada beton. [EN] This study uses the Self Healing Concrete method where the concrete is expected to be able to repair itself from crack damage by utilizing bacteria obtained from vegetable waste extracts. To determine the increase in the strength of concrete after being mixed with tomato waste and adhesive manufacturer 78 (AM78) additive with a self-healing concrete method with variations of vegetable waste 3%, 5%, 7%, 9% and 1% adhesive manufacturer 78 and to know the effect of adding vegetable waste extract and Adhesive Manufacturer (AM78) on concrete with self-healing concrete method for the recovery of cracks that occur in concrete. This research is experimental (reserch) conducted in the laboratory with reference to SNI 03-2834-2000 with a cube-shaped test object of 27 samples. The treatment period is 28 days and a pressure test will be carried out. Crack recovery in concrete can only be seen visually by taking pictures. The results of this study, the compressive strength of the uncracked concrete was 1% adhesive manufacturer 78 and 3%, 5%, 7%, 9% vegetable waste respectively 44.59 Mpa, 42.28 Mpa, 42.71 Mpa, 49.85 Mpa, 41.25 Mpa, while the compressive strength of cracked concrete with variations of 3%, 5%, 7%, 9% respectively were 36.85 Mpa, 38.02 Mpa, 42.16 Mpa, 44.68 MPa. The slump value in the 1% adhesive manufacturer 78 mixed concrete has a value of 43 mm, the variation of 3%, 5%, 7%, 9% concrete is 44.33 mm, 45.66 mm, 48.33 mm, 53 respectively. .66 mm, while the cracked concrete has slump values of variations of 3%, 5%, 7%, 9% respectively are 48.66 mm, 47 mm, 44.33 mm, 42.66 mm. The visual restoration of cracks in concrete with 28 days of treatment can close hair-sized cracks in concrete.

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