Perkembangan dunia konstruksi yang sudah sangat pesat di Indonesia terbukti dengan adanya metode baru untuk konstruksi yaitu Building Information Modelling (BIM). Munculnya BIM ini diklaim dapat membuat pekerjaan menjadi efektif dan efisien. Sebelum adanya BIM, kegiatan engineering dilakukan dengan menggunakan metode konvensional atau yang telah dikenal dengan AutoCAD, SAP, Ms. Project yang sering digunakan untuk pekerjaan perencanaan proyek. Pekerjaan menggunakan aplikasi tersebut memakan lebih banyak waktu karena dari masing-masing aplikasi tersebut harus dikerjakan secara manual. Hal ini berbeda dengan BIM yang antar aplikasinya dapat terintegerasi satu sama lain, sehingga dapat mempercepat proses pekerjaan yang akan menyingkat waktu dan juga membuat sumber daya manusia menjadi lebih sedikit. Dalam penelitian ini akan dijelaskan apa saja perbedaan jelas proses perencaan konstruksi khususnya saat pembuatan metode kerja dan shopdrawing yang ditinjau dari segi biaya, mutu, waktu. Dan juga akan mengetahui apa saja kelebihan dan kekurangan BIM karena ini adalah sesuatu yang baru, maka dari tiu untuk penelitian ini dilakukan dengan metode kueisioner dan wawancara kepada para draftrer dan engineer yang sudah berkecimpung didunia konstruksi dan sudah merasakan menggunakan BIM. Dengan studi kasus perencanaan Jalan Tol Jakarta – Cikampek II Selatan (Paket 3) dilakukan perbandingan efiseiensi biaya dan waktu dengan metode konvensional dan BIM. Penelitian ini menghasilkan kesimpulan bahwa aplikasi BIM dapat mempercepat proses pelaksanaan kerja sebesar 43.82%, tetapi berbeda dengan biaya lebih mahal dari konvensional dikarenakan biaya investasi awal untuk lisensi software yang mahal.
Extreme weather triggers high-intensity rainfall, and it triggers land movement that eventually becomes landslides. The water of rain will enter to the ground through the rock gaps and accumulate along the landslide area to reduce effective stress and reduce the shear strength of the soil. Morphologically, Sukaresmi Village, Cisaat Sub-District, Sukabumi Regency is located at the foot of Mount Gede with a bumpy surface relief. This condition is one factor that triggers landslides because the soil is prone to movement. This research aims to identify the field slope zone for landslide prediction in the Sukaresmi village, hoping that the surrounding community could anticipate further landslides. The research was carried out using the Geoelectrical Resistivity method of the Schlumberger configuration as many as eight measuring points with 1 m electrode spacing. This research indicates that the subsurface conditions are divided into three constituent rocks: Clay, Tuff, and Volcanic Breccia. The field slide zone is located between the Tuff rock and turf layer at a depth of 4-7. 5 m long, 82 m (Line 1), and 40 m (Line 2), with a resistivity value range of 56-158 Ωm. The efforts that the local government can make to anticipate the condition of the building to remain safe include analyzing soil stability, strengthening slopes, and making retaining walls to increase the value of the safety factor.
The porous asphalt mixture is a new generation of flexible pavement that is able to pass water in the upper layer (wearing course) both vertically and horizontally. The porous asphalt layer effectively provides more safety, especially when it rains to avoid aquaplaning which causes roughness of the surface to be more rough. Therefore, at this time there are many studies on the use of alternative materials to replace the limited natural materials with materials that can be utilized. The results showed that porous asphalt mixture with used tire crumb as a fine aggregate mixture had an increase in flow value of 6.32% with a decrease in stability value by 27.52% and a decrease Marshall Quotient value at 31.82%. The testing of roughness is increased by 17.71% and Mu-Meter 24.14%. This research is effective in overcoming environmental problems which include processing tire waste of 3.03 tons for 1 km of road pavement construction work.
Seawater intrusion can cause groundwater that is looked fresh initially but becomes brackish and even salty. It makes decreasing the quality of groundwater in the area. The Goa Cina Beach, Malang has a geological structure of rock in limestone, sand, and gravel. These rocks have greater porosity, so that the potential to pass water or water infiltration is also quite large, both freshwater and saltwater. Starting from these problems, it is needed to identify groundwater distribution that is not affected by the seawater intrusion process. The geoelectric method effectively determines geological parameters such as depth of bedrock, minerals, fluids, and shallow exploration to identify groundwater aquifers. Data acquisition was carried out using the geoelectrical resistivity method with Wenner configuration with three measurement points. Furthermore, the data processing used Res2dinv Software. The results showed that the measured resistivity value between 0.01000-501 Ωm with a maximum depth of 19.9 meters. The seawater intrusion distribution is assumed to be on lines 1 and 2 at an average depth of 10-19.9 meters with a resistivity value of 0.01000-0.230 Ωm. At the same time, the area that is not expected to experience seawater intrusion is on Line 3. The making of wells for coastal areas needs to consider the distance from the shoreline and rock porosity for minimizing the potential for seawater intrusion.
Excessive use of cement can cause damage to the environment. Using materials that have similar properties to cement as a concrete mixture can reduce the use of cement. Because the silica content in glass is quite large, glass has the potential to be used as a partial substitute for cement in concrete. This study aims to determine the effect of glass powder used as a partial cement substitute on the compressive strength of normal concrete. This study uses cylindrical specimens with 15 cm in diameter and 30 cm in height according to SNI 03-2834-2002. They were tested at seventh, fourteenth, and twenty-eighth day. The variations of the glass powder are 0%, 4%, 8%, 12%, and 16%. Based on the results of the testing at the twenty eighth days, the concrete's compressive strength at 0% variation is 22.8 MPa, at 4% variation is 24.0 MPa, at 8% variation is 17.5 MPa, at 12% variation is 17.6 MPa, and at 16% variation is 7.9 MPa. Thus, using glass powder as a partial substitute for cement in concrete mixtures affects the compressive strength of normal concrete. At the twenty-eighth day, the compressive strength of the concrete has increased by 5% to 24.0 MPa.
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