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ANALISIS INJEKSI EPOXY PADA PERBAIKAN RETAK BETON TERHADAP BEBAN LENTUR Herlambang, Fajar Surya; Setyono, Evin Yudhi
Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Vol 23, No 2 (2018): Wahana Teknik Sipil
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/wahanats.v23i2.1360

One of the causes of cracking in concrete beams is excessive gravitational load,mainly due to live loads that exceed capacity. The cracked beam can be repaired by the epoxy injection method but the condition of the repair is the strength value must reach the condition before cracking. The purpose of this study was to determine the effectiveness of injection in filling cracks and assessing epoxy ability in restoring beam strength. The specimen is a f'c 25 reinforced concrete block with dimensions of 15x15x60 cm. Tests are carried out with 2 methods, that are loading test according to SNI 03-4154-1996 and UPV. Load test and UPV were carried out at the age of 28 days and 3, 6. 9 days after epoxy injection. Based on the load test, epoxy injection is able to restore beam flexural strength up to 50% which is indicated by achieving load values after being injected. From the UPV test, it is known that epoxy injection is able to fill cracks which are characterized by increasing ultrasonic wave propagation speed on the test object after injection compared to when cracked but the injection cannot completely fill the cracked area which is indicated by a smaller wave propagation value than when the object the test has not experienced a crack. Based on a series of research activities, it is very necessary to pay attention to the injection process such as viscosity and injection pressure in order to obtain good results.Kata kunci : crack, injection, epoxy

COMPARISON OF ULTRASONIC PULSE VELOCITY TEST RESULTS WITH AND WITHOUT USING TRANSDUCER STABILIZER Herlambang, Fajar Surya; Setyono, Evin Yudhi
Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Vol 25, No 1 (2020): Wahana Teknik Sipil
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/wahanats.v25i1.1914

Some research on the Ultrasonic Pulse Velocity (UPV) test has not covered much about the problems encountered during the data collection process. Based on experience using UPV test equipment, it is known that instability occurs in reading the test results. This is caused by the inability of the operator, in maintaining the stability of the transducer both in its position and pressure, especially in the measurement with the overhead position. Therefore, in this study a tool was made to make the transducer stable in the test position. Comparison of measurement results shows that, the uncertainty of wave velocity measurement decreases from the range of 4% -17% to 0.2% -0.4%. Meanwhile, the uncertainty of measurement of wave travel time decreased from the range of 0.8% -14% to 0.1% -0.4%. This can be interpreted that, the level of accuracy of measurements using a transducer stabilizer is 99.6% -99.9%. Thus, the use of transducer stabilizers is believed to be able to improve measurement accuracy.

ANALISIS WASTE MATERIAL KONSTRUKSI PADA PROYEK GEDUNG (STUDI KASUS PADA PROYEK GEDUNG DI KABUPATEN BADUNG) IGAI Mas Pertiwi; Fajar Surya Herlambang; W Sri Kristinayanti
JURNAL SIMETRIK Vol 9, No 1 (2019)
Publisher : Pusat Penelitian dan Pengabdian Kepada Masyarakat (P3M) Politeknik Negeri Ambon

Kontribusi bidang konstruksi terhadap kerusakan alam diantaranya berasal dari pengambilan material, proses pengolahan material, distribusi material, proses konstruksi, pengambilan lahan untuk bangunan serta konsumsi energi pada operasional bangunan. Selain menimbulkan kerusakan alam pada saat pengambilan material, kegiatan konstruksi juga menghasilkan limbah yang cukup banyak. Salah satu agenda yang banyak diperbincangkan untuk menanggulangi masalah global warming dan limbah konstruksi adalah melakukan promosi sustainable construction atau yang sering disebut sebagai konstruksi berkelanjutan. Dalam konsep green construction salah satu hal yang perlu diperhatikan adalah pengelolaan limbah atau waste management. Tujuan penelitian ini adalah mengetahui jenis dan kuantitas sisa material konstruksi dominan yang timbul di proyek konstruksi dan mengkaji dampak sisa material konstruksi dominan tersebut terhadap lingkungan. Sampel penelitian adalah consumable material proyek konstruksi gedung di kabupaten Badung. Metode yang digunakan untuk pengumpulan data adalah pengamatan lapangan, wawancara dan penyebaran kuisioner. Analisis data menggunakan analisis kuantitatif untuk mengetahui jenis dan kuantitas sisa material konstruksi dengan menghitung waste index dan wastage level. Selanjutnya sisa material konstruksi tersebut dihitung waste cost untuk mengetahui besarnya kerugian biaya yang terjadi. Hasil penelitian terhadap variable waste dan penyebab terjadinya waste material yang terjadi pada proyek pembangunan Gedung adalah penambahan jenis pekerjaan dan pekerjaan struktur merupakan variable paling dominan terhadap terjadinya waste dan pekerjaan rework and repair, revisi dan distribusi gambar yang lambat serta perubahan desain merupakan faktor yang mempunyai dampak/pengaruh paling tinggi terhadap terjadinya waste. Sedangkan untuk jenis material proyek yang mempunyai prosentase terbesar sebagai waste adalah besi beton ulir, besi beton polos, batu bata dan keramik.

COMPARISON OF ULTRASONIC PULSE VELOCITY TEST RESULTS WITH AND WITHOUT USING TRANSDUCER STABILIZER Fajar Surya Herlambang; Evin Yudhi Setyono
Wahana Teknik Sipil: Jurnal Pengembangan Teknik Sipil Vol 25, No 1 (2020): Wahana Teknik Sipil
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/wahanats.v25i1.1914

Some research on the Ultrasonic Pulse Velocity (UPV) test has not covered much about the problems encountered during the data collection process. Based on experience using UPV test equipment, it is known that instability occurs in reading the test results. This is caused by the inability of the operator, in maintaining the stability of the transducer both in its position and pressure, especially in the measurement with the overhead position. Therefore, in this study a tool was made to make the transducer stable in the test position. Comparison of measurement results shows that, the uncertainty of wave velocity measurement decreases from the range of 4% -17% to 0.2% -0.4%. Meanwhile, the uncertainty of measurement of wave travel time decreased from the range of 0.8% -14% to 0.1% -0.4%. This can be interpreted that, the level of accuracy of measurements using a transducer stabilizer is 99.6% -99.9%. Thus, the use of transducer stabilizers is believed to be able to improve measurement accuracy.

Kuat Tekan Beton Pasca Kebakaran pada Struktur Beton Bertulang di Pasar Seririt, Buleleng, Bali Fajar Surya Herlambang; I Komang Sudiarta
Logic : Jurnal Rancang Bangun dan Teknologi Vol 15 No 1 (2015): March
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (97.679 KB)

struktur beton bertulang yang mengalami kebakaran dalam jangka waktu lebih dari 4 jam danmenghanguskan seluruh isi bangunan diyakini akan mengalami penurunan nilai kuat tekan. Walaupun demikiantidak serta merta struktur tersebut dibongkar jika bangunan akan difungsikan kembali. Untuk itu perlu dilakukananalisis menyeluruh terhadap struktur bangunan tersebut. Salah satu data penting dalam melakukan analisisadalah nilai kuat tekan beton pasca kebakaran. Dalam penelitian ini, tinjauan permasalahan adalah mengetahuikuat tekan beton pasca kebakaran pada Pasar Seririt di Kabupaten Buleleng, Provinsi Bali. Pengujian kuat tekanbeton yang digunakan adalah uji kuat tekan beton inti dan uji Hammer. Karena Pasar Seririt telah berdiri sejaktahun 1990-an dan tidak ditemukannya data teknis, maka digunakan Peraturan Beton Bertulang Indonesia 1971sebagai acuan dasar pembahasan. Dari hasil pengamatan di lapangan diketahui beton mengalami keretakan,pengelupasan selimut beton, perubahan warna dan menjadi rapuh sedangkan dari hasil pengujian diketahuibahwa kuat tekan beton masih dalam kriteria struktur atau lebih besar dari 225 kg/cm2 (K225). Berdasarkan hasilpengukuran dimensi di lapangan diketahui bahwa tebal plat lantai tidak memenuhi kriteria tebal minimumketahanan terhadap kebakaran sehingga mengalami kerusakan yang menyeluruh.

Tinjauan Kuat Tekan Beton Akibat Curring Pada Beton yang Dicor di Lapangan I.G.A. Neny Purnawirati; Fajar Surya Herlambang
Jurnal Talenta Sipil Vol 5, No 1 (2022): Februari
Publisher : Universitas Batanghari Jambi

Pelaksanaan curring beton adalah perawatan beton yang dilakukan setelah beton mengeras. Bertujuan agar beton tidak kehilangan kelembaban terlalu cepat, yang nantinya dapat memicu terjadinya penyusutan pada beton. Jika kelembaban terjadi terlalu cepat, maka beton dapat mengalami penyusutan lebih cepat dan menyebabkan beton mengalami keretakan. Proses pengerasan beton hingga beton tersebut berumur 28 hari, diperlukan adanya perlakuan khusus, yakni perawatan beton. Dalam proses pengerasan beton, terjadi hidrasi semen yang mengakibatkan adanya uap air. Jika beton terlalu cepat kehilangan air, maka beton akan menjadi retak dan tentunya berpengaruh pada kuat tekan akibat retak tersebut. Berdasarkan hal tersebut, dalam penelitian ini dilakukan pembuatan benda uji berupa pelat lantai dengan Panjang 1 meter dan lebar 1 meter dengn tebal pelat lantai 12 cm. Pelat ini dilengkapi dengan besi 15âˆ… "> 8 mm – 150 mm dan perancah. Benda uji dibuat sebanyak 2 buah benda uji, yakni 1 benda uji diperlakukan dengan curring dan 1 benda uji diperlakukan tanpa curring. Mutu beton direncanakan 20 MPa dengan umur beton 28 hari. Curring beton dilakukan selama 7 hari berturut – turut dengan cara menyiram permukaan beton secara continue. Pengujian kuat tekan beton dilakukan setelah beton berumur 28 hari dengan pengujian non destructive test. Pelat lantai dengan yang melewati proses curring beton selama 7 hari berturut turut, menghasilkan kuat tekan maksimum sebesar 23,41 MPa. Pelat lantai yang tidak melewati proses curring beton menghasilkan kuat tekan maksimum sebesar 21,32 MPa. Pelat lantai dengan curring beton meningkatkan kuat tekan beton sebesar 13,46% dibandingkan dengan pelat lantai tanpa curring beton.

OPTIMALISASI PEMANFAATAN LIMBAH ABUTA (ABU SEKAM PADI, DAN SERBUK BATA) SEBAGAI SUBTITUSI SEMEN PADA CAMPURAN BETON RAMAH LINGKUNGAN Wicaksono, Teguh Mulyo; Mukhlisin, Muhammad; Fatmawati, Leily; Rahmawati, Roselina; Supriyadi, Supriyadi; Sukoyo, Sukoyo; Sudarmono, Sudarmono; Herlambang, Fajar Surya; Anastasya, Frida
Bangun Rekaprima Vol 10, No 1 (2024): April 2024
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/bangunrekaprima.v10i1.5681

Construction prioritizes the strength of concrete without thinking about the negative impact on the environment. The cement industry is estimated to contribute 5-7% of CO2 gas emissions in the world. On the other hand, Indonesia is also faced with environmental problems caused by various industrial waste. From this problem an innovation emerged, namely ABUTA (husk ash and brick ash). The aim of this innovation is to create a concrete innovation using Abuta Waste (Rice Husk Ash, and Brick Powder). For the manufacture of economical, environmentally friendly concrete to reduce the negative impacts caused by excessive use of cement and reduce industrial waste in Indonesia. In writing this proposal the author used the experimental writing method and data collection method. The concrete innovation applied is concrete with a mixture of variations in the composition of rice husk ash powder and red brick powder of 10% of the cement composition in conventional concrete so that it is more economical and environmentally friendly. In this study, the ACI (American Concrete Institute) mix design method was used with the required design quality of 30 MPa. It is hoped that this innovation can become an environmentally friendly concrete innovation to reduce the negative impacts of excessive cement use and reduce industrial waste in Indonesia. Based on the mix design, the proportion of ash mixture (rice husk ash and brick powder) is 1:1. Meanwhile, the ratio of the amount of ash mixture to cement is 10%: 90%. The compressive strength of concrete with a 0% Abuta mix variation (7 days old) was 19.5, while the concrete innovation with a 10% Abuta mix variation (7 days old) was 15.70 Mpa. This means that the 10% mixture reduces the compressive strength value by 46.28% below the 0% abuta mixture variation. Using a mixture of 10% ash (rice husk ash and brick powder) in innovative concrete can reduce production costs by IDR. 76,700/m³. Based on the materials obtained in this manufacture, it can be concluded that to obtain optimal compressive strength, better quality materials are needed. The application of concrete can be applied in casting work floors and non-structural construction work such as buildings that require general load power such as housing, sculpture, home interiors and others.

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

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.

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