Jurnal Rekayasa Sipil dan Desain
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Komparasi Kadar Daya Dukung Tanah Berbutir Halus Berdasarkan Uji CBR Menggunakan Alat Tekan Modifikasi dan Modified Proctor
Get PDFThe importance of soil as construction material needs to be considered carefully. With various soil conditions, a physical test is required to discover the characteristics of the soil and California Bearing Ratio (CBR) test in a laboratory to determine the bearing capacity of the basic land (subgrade). This research was conducted to assess the suitability of the CBR test value with two different compaction tools. The results of this study showed that the soils were classified into A-6 clay soil type. On the modified proctor compaction test, the maximum weight volume (γdmaks) was 1,70 gr/cm3, while the compaction with modified press tool obtained 1,75 gr/cm3. Based on the results of the values obtained from CBR standard test is 11,5% and 1,32% for the soaked sample .While the CBR value without immersion with modified press tool are 7,7% for 3 MPa, 16,2% for 6 MPa, 19,5% for 9 MPa, 20,5% for 12 Mpa. For the soaked samples are 1,53% for 3 Mpa, 2,7% for 6 Mpa, 3,56% for 9 Mpa, and 4,33% for 12 Mpa. In conclusion, the CBR value escalation is higher when using the modified pressure tool compared with the CBR standard method
Pengaruh Penggunaan Semen PCC pada Kuat Lentur Perkerasan Kaku dengan Penambahan Serat Kulit Kayu Gelam Pada Campuran Beton
Get PDFThe flexural strength of rigid pavement is the dominant parameter that influences the concrete pavement performance. In general, concrete is weak against its flexural tensile strength. One alternative that can be used to increase its flexural tensile strength is by adding artificial fibers and/or natural fibers to the concrete mixture. The purpose of this research is to find the effect of adding gelam bark fibers towards compressive strength, split tensile strength, and flexural strength of concrete using PCC cement. In this study, the concrete mixture was added with various percentages of fiber content i.e. 0,2%; 0,3%; 0,4%; 0,6%. The concrete was tested and compared its value of compressive strength, split tensile strength and flexural strength. The results of this study showed that the most influential use of fiber for concrete pavement was 0,4%. The addition of gelam bark fiber by 0,4% could increase the tensile strength of the concrete mixture aged 28 days and 56 days respectively by 6,95% and 23.72% toward the concrete without fibers. The testing of concrete at 28 days age results the split tensile strength value decreased by 4,2% and the compressive strength test decreased by 4,7%.Keywords: Gelam bark fiber, PCC cement, OPC cement, flexural tensile strength, split tensile strength and compressive strengt
Studi Kasus Pada Ruas Jalan Kecamatan Batu Ketulis Lampung Barat dengan Menggunakan Analisis Komputasi dan Metode Penanganannya
Get PDFBatu Ketulis is a sub-district located in West Lampung Regency, Lampung province. West Lampung is one of the areas in Lampung that has landslide-prone potential. This study is to determine the value of slope safety factors and calculate the stability of slopes using Bronjong to hold the soil carrying capacity to be safe and not landslide, which is calculated using computational programs with fellenius method, bishop with saturated, partially saturated, and unsaturated groundwater face conditions. The results showed that soil parameters affect the stability of the slope, the condition of fully saturated soil has the lowest value compared to other conditions. From the results of the study obtained the value of the smallest safe factor before handling, namely at location II with an elevation of 20 m and a slope angle of 30° ,35° ,40° of 1,074, 1,023, 1,008 in the condition of fully saturated groundwater face. In the condition of the slope after handling using bronjong obtained a value of 2,462, 2,303, 2,223 for the Fellenius method, while for the Bishop method of 2.12, 2,006, 1.95. Handling using bronjong has a big effect on increasing safe factors so that landslide handling using bronjong is quite stable if applied at the research site
Perbandingan Analisis Data Curah Hujan yang Hilang di Daerah Lampung Barat dengan Menggunakan Metode Normal Ratio, Rata-Rata Aljabar, Inversed Square Distance, dan Modified Method
Get PDFCurah hujan merupakan data yang sangat penting untuk memprediksi kondisi suatu daerah sebagai awal dari perencanaan pembangunan. Namun ada kalanya alat pencatat hujan pada stasiun tertentu rusak sehingga data hujan tidak tercatat atau disebut hilang. Dalam penelitian ini, saya mencoba menganalisis data curah hujan di lampung barat dengan menggunakan metode rata-rata aljabar, normal ratio, inversed square distance, serta metode modifikasi. Setelah saya teliti ternyata didapatkan bahwa metode modifikasi inversed square distance yang saya buat mendapatkan hasil yang paling baik. Nilai korelasi metode tersebut termasuk dalam kategori cukup baik. Kata kunci : Data Hujan Hilang, Curah Hujan, Lampung Barat, Metode Rata-Rata Aljabar, Metode Normal Ratio, Metode Inversed Square Distance, Metode Modifikas
Kinerja Fly Ash terhadap Stabilisasi Tanah Lunak sebagai Material Perbaikan Tanah Dasar (Subgrade)
Get PDFSubgrade has an important role in road construction work planning. However, a problem may appear because the soil which is used as the subgrade material has low quality, such as soft soil. One of the parameters to know the quality of the soil is by CBR testing and Atterberg Limit to know the index properties of soil that affect the quality. It is necessary to improve the subgrade soil through stabilization to produce construction materials based on standards by using additives in the form of fly ash. In this study, some variations of fly ash as a stabilization material are 0%, 5%, 10%, and 15% with curing time of 0 days, 7 days, and 14 days at room temperature. The results showed CBR value increased along with the increase in fly ash percentage as well as the length of curing time. The optimum CBR is 23.89% which is occurred in the addition of 15% fly ash with a 14-day curing time of at room temperature. The addition of fly ash percentage also affects the plasticity index of soils that have decreased from native soil by 28.19% to 9.02% in the addition of 15% fly ash. Key words : fly ash, soil stabilization, soft soil, CB
Hubungan Pengujian Cbr Metode Tumbukan Dengan Alat Uji Cbr Metode Tekanan Berdasarkan Uji Pemadatan Standard
Get PDFThe importance of soil as construction material needs to be considered carefully. With various soil conditions, a physical test is required to discover the characteristics of the soil and California Bearing Ratio (CBR) test in a laboratory to determine the bearing capacity of the basic land (subgrade). This research was conducted to assess the suitability of the CBR test value with two different compaction tools.The results of the CBR test with the collision method without immersion resulted in the design CBR value of 7.7% and the CBR value of the immersion sample of 3.6%. Meanwhile, the CBR test using a pressure modification device, the CBR values obtained in the samples not immersed at a pressure of 3 MPa, 6 MPa, 9 MPa, and 12 MPa, were 4.2%, 6.8%, 9.8%, and 11.4%. The CBR valuesfor the immersion samples were 2.95%, 4.2%, 4.45%, and 4.56%. The results obtained from the design CBR value of the pressure method with a pressure of 6MPa which is closest to the collision CBR value with a difference of 0.9% for no immersion and 0.6% for immersion. The assumption that the difference between the two methods is due to the compaction energy of 6 MPa strength is not the same as the energy produced from the use of hammer energy according to ASTM D 698, Test Method for Laboratory Compaction Characteristics
Simulasi Tampungan Bendungan Sukamahi, Kecamatan Megamendung Kabupaten Bogor
Get PDFBanjir yang sering terjadi di wilayah Jakarta dan sekitarnya yang hampir terjadi setiap tahunnya atau setiap musim penghujan datang menimbulkan kerugian harta benda, selain itu juga menggangu kegiatan perekonomian. Salah satu upaya untuk mengurangi pengaruh kerugian yang disebabkan oleh banjir di kota Jakarta tersebut yaitu membangun 2 (dua) buah bendungan di Daerah Aliran Sungai Ciliwung yang terletak di hulu sungai yang berada di Kabupaten Bogor, yaitu Bendungan Sukamahi yang berfungsi sebagai pengendalian banjir sungai ciliwung oleh sebab itu dilakukan simulasi tampungan menggunakan program HEC-HMS 4.5.Penelitian ini dibutuhkan beberapa analisis antara lain meliputi hujan harian maksimum, curah hujan rancangan, hujan efektif, hidrograf satuan banjir rancangan, dan simulasi tampungan menggunakan program HEC-HMS 4.5.Berdasarkan penelitian ini menunjjukan bahwa curah hujan yang mungkin terjadi (PMP) mrncapai 571,7967 mm, debit banjir 2, 5, 10, 20, dan 50 tahun mencapai 56,6853 m3/det, 72,8729 m3/det, 84,1311 m3/det, 110,5354 m3/det. Selain debit banjir, dalam penelitian ini berdasarkan terowongan tertutup didapat kapasitas pelimpah dan volume tampungan dalam kala ulang 50 tahun yaitu didapat tinggi muka air maksimum yaitu 597,4 m, dengan kelebihan 0,65 m diatas spillway dengan volume sebesar 969400 m3.Kata kunci : HEC-HMS, Bendungan, PMP, Simulasi Tampungan
Analisis Pengaruh Pembagian SUB-DAS Terhadap Debit Puncak dengan Menggunakan Software HEC-HMS
Get PDFSungai Way Besai yang terletak pada kecamatan Sumberjaya, kabupaten Lampung Barat memiliki DAS yang cukup besar sehingga DAS tersebut dapat dibagi dalam beberapa Sub-DAS. Pembagian jumlah Sub-DAS di sungai Way Besai dilakukan untuk mengetahui apakah terjadi perbedaan nilai debit puncak pada saat dilakukan perhitungan debit puncak pada beberapa jumlah sub-DAS yang berbeda. Model HEC-HMS merupakan model hidrologi numerik yang dikembangkan oleh Hidrologic Engineering Center (HEC) dari US Army Corps Of Engineers. Pada penelitian ini dilakukan 3 pembagian sub-DAS yaitu pembagian 5 sub-DAS, 11 sub-DAS, dan 25sub-DAS. Metode yang dilakukan pada software HEC-HMS yaitu metode user gage weighting untuk perhitungan precipitation, metode SCS curve number untuk perhitungan volume runoff, metode SCS unit hydrograph untuk perhitungan direct runoff, metode constant monthly untuk perhitungan baseflow, dan metode muskingum untuk perhitungan routing. Hasil dari penelitian ini menunjukan bahwa semakin banyak jumlah pembagian sub-DAS semakin besar nilai debit puncak yang dihasilkan
Analisis Kedalaman Gerusan Lokal (Local Scouring) di Hilir Bangunan pelimpah (Stepped Modified Spillway) dengan Model Fisik 2D
Get PDFSpillway is a hydraulic structure whose existence is very important because it is built to release excess water or flood discharge that cannot be accommodated in the dam. The hydraulics analysis of this study used a spillway design (Stepped modified Spillway) with a 2-D physical model and the sediment used was sand with a uniform diameter of 1.8 mm or passed sieve no. 16. This research was carried out 5 times for every 25 minutes of upstream water level observations.In the Stepped spillway spillway the maximum scour (dsmax) occurs at an upstream height (H0) of 3 cm of 0.125 m with an Lds of 0.09 m from the downstream of the spillway. Meanwhile, for the Stepped Modified Spillway spillway, the maximum scour (dsmax) occurs at an upstream height ( H0) 3 cm is 0.076 m with Lds of 0.221 m. This shows that the greater the flow rate, the greater the depth of scour that occurs. So it can be concluded that the Lacey method is the closest to the laboratory results. This is because a balance has been achieved. The deeper the local scour that occurs, the more volume of sediment carried downstream of the weir.Keywords: Stepped and stepped modified spillway, local scour, sediment
Hubungan Nilai CBR Laboratorium dengan Pemadatan Modified dan Nilai Dynamic Cone Pentrometer (DCP) di Lapangan
Get PDFTanah merupakan salah satu bagian penting dalam pekerjaan konstruksi teknik sipil. Kekuatan tanah dasar sangat penting guna menopang beban konstruksi. Beberapa cara untuk mengestimasi nilai CBR adalah dengan soil grading dan data plastisitas tanah. Namun pada kenyataannya di lapangan, banyak kendala yang dihadapi maka seringkali dilakukan uji DCP (Dynamic Cone Penetrometer). Penelitian ini dilakukan untuk mengetahui persamaan hubungan antara CBR laboratorium dan DCP serta perbandingannya dengan persamaan SNI. Penelitian dilakukan dengan menguji tanah di Teluk Ratai Kabupaten Pesawaran pada tiga titik dengan pengujian CBR laboratorium (Unsoaked), DCP mould, dan DCP lapangan. Sampel tanah dipadatkan dengan variasi pemadatan 10, 25, dan 56 tumbukan dan kadar air optimum sebesar 22,95% yang didapat dari uji pemadatan dengan proctor modified. Hasil penelitian menunjukkan persamaan korelasi CBR Laboratorium dengan gd adalah y = 30,878x – 26,98 dengan korelasi persamaan CBR dan DCP didapat Log (CBR) = 2,26557 – 0,807 Log (DCP). Bila dibandingkan dengan nilai CBR hasil persamaan CBR SNI, nilai CBR dari persamaan CBR dan DCP memiliki nilai yang lebih tinggi. Kata kunci : tanah, daya dukung, CBR laboratorium, DCP lapangan