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All Journal Mitra Akademia: Jurnal Pengabdian Masyarakat Jurnal Talenta Sipil
Purnawirati, I.G.A. Neny
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Humanities Civil Engineering, Building, Construction & Architecture Economics, Econometrics & Finance Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Social Sciences

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Biaya dan Waktu pada Pelaksanaan Pekerjaan Struktur Balok Precast dan Balok Konvensional Purnawirati, I.G.A. Neny; Herlambang, Fajar Surya
Jurnal Talenta Sipil Vol 7, No 2 (2024): Agustus
Publisher : Universitas Batanghari Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33087/talentasipil.v7i2.628

Abstract

Concrete is a construction material that is widely used in Indonesia, when compared to the use of wood and steel materials, there are two methods of concrete work, namely the conventional method and the precast method. In the Kuta Art Market Development Project there are several blocks using the conventional method and some using the precast method. How to compare the cost and time of conventional beam work and the precast method and which method is more effective to use. To be able to determine the choice of the right method to use, an analysis of costs and implementation time is carried out. Furthermore, the results of the analysis are compared so as to get an effective method to use. From the results of the analysis carried out at the Kuta Art Market Development Project, a comparison of costs and implementation time obtained that the total cost for the work of 5 conventional blocks was IDR 47,656,004.04 and the time needed to complete the work of 5 conventional blocks was 5 days. Whereas the total cost required for the work of 5 precast beams is Rp. 46,006,742.42 and the time required to complete the work of 5 precast beams is 4.09 days. When compared, the cost of precast beam work is Rp. 1,649,301.32 (3.5%) cheaper and the execution time for precast beam work is 0.91 days (18%) faster than conventional beam work.
Kuat Lentur Balok Tanpa Tulangan dengan Kemiringan Sambungan 45o di Setengah dan Seperempat Bentang Herlambang, Fajar Surya; Purnawirati, I.G.A. Neny
Jurnal Talenta Sipil Vol 8, No 1 (2025): Februari
Publisher : Universitas Batanghari Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33087/talentasipil.v8i1.857

Abstract

Concrete casting processes in projects often cannot be completed in a single, continuous pour. This can be due to staged construction methods, extensive casting areas resulting in large concrete volumes, or limitations in manpower, equipment, and materials. Consequently, construction joints become necessary. This study aims to identify how variations in the inclination of joints in unreinforced concrete beams affect their flexural strength. Additionally, it seeks to compare the flexural strength between unreinforced beams with varying joint inclinations to determine if there are significant differences in their load-carrying capacity. The research method involves casting several unreinforced concrete beam specimens with identical dimensions but varying joint inclinations. A flexural testing machine is then used to apply concentrated or distributed loads to these specimens. A common point of contention in the field is where the concrete casting should ideally be stopped. This research aims to address this question. The approach involves testing the flexural strength of concrete beams measuring 15x20x120 cm with a concrete compressive strength (f'c) of 20 MPa. These beams are unreinforced, allowing for the observation of concrete behavior without the influence of reinforcement. The beam casting is carried out in two stages with a 1-day interval between pours, and the joint inclination is set at 45 degrees. The joints are positioned at ¼ and ½ of the beam span. Concrete adhesive is added to the joints as a reinforcement measure. Flexural strength tests are conducted at concrete ages of 14, 21, and 28 days. The test results indicate that all beams with joints fractured at the joint, with the fracture pattern following the joint line. Overall, the flexural strength of beams with joints decreased by up to 75%. Therefore, incomplete concrete casting processes result in concrete joints that pose equal risks, and it cannot be determined whether joining at ¼ or ½ of the span is preferable. This demonstrates that concrete joints are vulnerable points prone to flexural failure
Peningkatan Pengetahuan Serta Keterampilan Penulangan dan Pengecoran Pada Masyarakat Candi Kuning, Tabanan, Bali Surya Herlambang, Fajar; Purnawirati, I.G.A. Neny; Ardika, I Nyoman; Intara, I Wayan; Suasira, Wayan; Jaya, I Made
Mitra Akademia: Jurnal Pengabdian Masyarakat Vol 6 No 3 (2023): Mitra Akademia: Jurnal Pengabdian Masyarakat
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/mapnj.v6i3.5725

Abstract

Reinforced concrete is the most widely used structure compared to steel or wood. Reinforced concrete is generally very easy to work with. The material is very easy to get. It's so easy, it's often done by workers who don't have knowledge and skills about concrete structures. This condition is exacerbated by building owners who do not pay attention to the details of reinforced concrete structures. The owner does not want to pay for the planning consultant or supervisor. The combination of these causes the condition of the building to be not in a safe condition even though in reality there are still many buildings that are being worked on haphazardly and are still in good condition. In the rules of Civil Engineering where safety is the main thing, the conditions above must be corrected. One of the efforts of the academic community to improve this situation is to implement a Community Service Program (PKM) in the form of Technical Guidance (Bimtek) for construction workers. This Bimtek is filled with the provision of theory and practice. The theory presented is knowledge about reinforcement and concrete constituent materials. While the practice consists of working on reinforcement: cutting, bending and assembling reinforcement. For concrete practice consists of mixing and casting concrete. From this Bimtek, the construction workers understand and able to do reinforcement, mix and pour concrete properly. It is hoped that after attending this Bimtek, the construction workers will be able to apply their knowledge and skills to the projects they are working on in order to obtain a good reinforced concrete structure. In its implementation, this Bimtek received a good reception from the Perbekel and the community. In his speech, the Perbekel of Candi Kuning Village hoped that the masons who had attended this Bimtek would become pioneers of correct concrete structure work, be able to increase competitiveness and get increased wages. Through the representatives of the participants, they expressed their gratitude for the knowledge taught and hoped that similar activities could be carried out again.
Co-Authors Fajar Surya Herlambang I Made Jaya, I Made I NYOMAN ARDIKA Intara, I Wayan Suasira, Wayan