Beach sands are one of the natural wealth sources in Indonesia. The beach sand are formed by the blasht of waves and ocean flow on the corals, then it will produce a smooth and round teksture that very good for concrete material. The reasearch uses beach sands and shells from Madura island as concrete materials. This reasearch also uses river sands as control. For material validation test the results to density of the sand beach of a 2,64, while in the river sand to density of 2,69. After a testing material of concrete, the next stage of the mix design with the quality of concrete plans K-225. The results from both of the materials are very satrsfying. From the mixed beach sand materials show compressive strength 227,41 kg/cm2, while in the river sands in compressive strength all the concrete at 260,00 kg/cm2. The use of shells as divided into three variations 3%, 5% and 7% from the needs of cement to show positive results in the proportion of the 3% and 5% compressive strenght all the concrete had increased to 237,78 kg/cm2, and 231,11 kg/cm2. While for the 7% proportion, the compressive strenght it decreases to 220,00 kg/cm2. So beach sand can be used as a mixture of concrete, and the proportion of seashells said he was 3% of the total demand for cement.Keyword: sand beach, shells, compressive strength ABSTRAK Pasir pantai adalah salah satu kekayaan alam yang melimpah di seluruh wilayah Indonesia. Pasir pantai yang terbentuk akibat hembusan ombak dan arus laut pada karang memiliki tekstur yang halus dan bulat sangat bagus untuk material penyusun beton. Pada penelitian ini digunakan pasir pantai pulau madura dan cangkang kerang sebagai penyusn beton. Sebagai pembanding penulis juga menggunakan pasir sungai sebagai kontrol. Pada uji material didapat berat jenis pasir pantai sebesar 2,64 gr/m3, sedangkan pada pasir sungai didapat berat jenis sebesar 2,69 kg/m3. Maka dari itu, pada penelitian ini penulis membuat dua mix design yang berbeda bergantung pada sifat-sifat material penyusun beton, tetapi mutu yang disyaratkan sama yaitu K-225. Dari dua material tersebut didapat hasil yang memuaskan, pada campuran pasir pantai didapat kuat tekan sebesar 227,41 Kg/cm3. Sedangkan pada pasir sungai di dapat kuat tekan sebesar 260,74 Kg/cm3. Penggunaan cangkang kerang menggunakan tiga variasi 3%, 5% dan 7% dari kebutuhan semen, menunjukkan hasil yang posistif pada proporsi 3% dan 5% kuat tekan beton berhasil naik menjadi 237,78 Kg/cm3 dan 231,11 Kg/cm3. Sedangkan pada 7% kuat tekan beton turun menjadi 220,00 Kg/cm3. Jadi pasir pantai bisa digunakan sebagai campuran beton, dan proporsi optimum cangkang kerang ialah 3% dari total kebutuhan semen. Kata kunci: Pasir pantai, Cangkang kerang, Kuat tekan betonJurnal Rekayasa Sipil dan Lingkungan, ISSN 2548-9518
Study ini membandingkan kuat hancur, berat volume antara beton ringan dengan beton dengan mengganti sebagian semen (PC) dengan limbah pertanian. Limbah pertanian yang dimaksud adalah sekam padi dan ampas tebu. Penggunaan limbah pertanian tersebut sebaga material pengganti semen dikarenakan mempunyai sifat pozzolan yang cukup tinggi. Pemakaian limbah pertanian ini dengan membakar ampas tebu dan sekam padi dengan suhu tertentu sehingga menjadi abu. Limbah tebu diambil dari Pabrik Gula Prajekan Bondowoso, dibakar dengan suhu 8000C selama 8 jam. Limbah Padi diambil dari limbah Pabrik Padi di Kalisat Jember, dibakar dengan suhu 8500C selama 45 menit. Kandungan silika dari hasil pembakaran tersebut masing-masing sebesar 59,5% dan 79,5% . Prosentase pengganti sebagian PC sebesar 5%, 10%, 15% dan 20%, dengan perbandingan campuran abu ampas tebu (AAT) dan abu sekam padi (ASP) adalah 1:1. Pengujian dilakukan pada umur 28 hari dengan bentuk benda uji silender berukuran 10x20 cm. Hasil kuat hancur tertinggi pada benda uji dengan subsitusi PC sebesar 5% dan berat volume yang terendah pada benda uji dengan pengantian semen sebesar 20%. Effect of Cement Substitution with Agricultural Waste on Lightweight Structural ConcreteThis study compares the shattering strength, volume weight between lightweight concrete and concrete by replacing part of the Portland cement (PC) with agricultural waste. The agricultural waste in question is rice husk and sugarcane bagasse. The use of agricultural waste is as a substitute for cement because it has quite high pozzolanic properties. Use of this agricultural waste by burning sugarcane bagasse and rice husk with a certain temperature so that it becomes ash. Sugarcane waste is taken from Bondowoso Prajekan Sugar Mill, burned at 8000C for 8 hours. Rice waste is taken from the rice factory waste in Kalisat Jember, burned at 8500C for 45 minutes. The silica content of the combustion products was 59.5% and 79.5%, respectively. The percentage of partial PC replacement is 5%, 10%, 15%, and 20%, with a ratio of bagasse ash (BA) to rice husk ash (RHA) is 1: 1. The test was carried out at 28 days in the form of a 10 x 20 cm slender test object. The highest yield of crushing strength in specimens with PC substitution of 5% and the lowest volume weight in specimens with cement replacement of 20%.
This research aims to make a bearing capacity distribution map of shallow foundations (footplate), which is to provide convenience in terms of examining substructure buildings planned by the consultant by the owner. Spatial concepts method, ArcGIS and kriging, are used to simplify the analysis stage in making bearing capacity maps. Bearing capacity distribution map of soil shows that most of the University of Jember area at two meters depth has hard soil consistency and has a bearing capacity of around 83.9 - 110.9 kg/cm2. The results of comparative analysis of ArcGIS and CPT has a ratio of 0,758 for point 1 and 0,765 for point 2.
Saat ini perkembangan konstruksi bangunan banyak mengarah ke bangunan green building. Green Building Council Indonesia (GBCI) telah menyelenggarakan kegiatan sertifikasi bangunan berdasarkan peringkat penilaian Greenship. Melalui Islamic Development Bank (IsDB) Universitas Jember melaksanakan pembangunan gedung Auditorium. Bangunan ini perlu adanya penerapan penilaian kriteria green building pada perencanaan gedung Auditorium agar dapat mengetahui rating/sertifikasi sebagai tolok ukur sudah sejauh mana tingkat penerapan kriteria green building. Metode yang digunakan pada penelitian adalah metode wawancara, observatif/pengamatan, dan studi dokumen. Penelitian dilakukan berdasarkan perangkat penilaian Greenship versi 1.2 tahap Desain Recognition (DR). Hasil penilaian kriteria green building gedung Auditorium Universitas Jember dari masing-masing kategori Greenship versi 1.2 diantaranya Tepat Guna Lahan memperoleh nilai 10 (sepuluh) poin, Efisiensi dan Konservasi Energi memperoleh nilai 7 (tujuh) poin, Konservasi Air memperoleh nilai 3 (tiga) poin, Sumber dan Siklus Material memperoleh nilai 2 (dua) poin, Kesehatan dan Kenyamanan Dalam Ruang memperoleh nilai 3 (tiga) poin, dan Manajemen Lingkungan Bangunan memperoleh nilai 3 (tiga) poin. Berdasarkan total akhir penilaian didapatkan poin sebesar 28 (dua puluh delapan) poin dengan presentase 36,36% dan berada pada predikat Perunggu (Bronze) berdasarkan Perangkat Penilaian Greenship untuk Bangunan Baru versi 1.2. kata kunci : green building, GBCI, Desain Recognition, dan Perunggu
The apartment is a vertical building used for residential purposes. It is included in a high rise building category with high occupational risk accident level due to its work complexity, or high elevation factors. This research discussed the risk assessment of occupational accident at one of the apartment constructions in Surabaya in order to determine its dominant risk factors and mitigation. Failure Mode and Effect Analysis (FMEA) method was applied to this research. It is a risk assessment method based on severity, occurrence, and detection. Following the relevant assessment, it resulted in 3 types of occupational accidents with the highest Risk Priority Number, namely height work accident, falling material from tower crane, and risk of landslide excavation.
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