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Fadly Achmad
Universitas Negeri Gorontalo
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ANALISIS KAPASITAS DUKUNG FONDASI BERDASARKAN IN SITU TEST PADA REHABILITASI SENTRAL KOTA GORONTALO abdul Djou; Indriati Martha Patuti; Fadly Achmad
Composite Journal Vol. 2 No. 1 (2022): Composite Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/cj.v2i1.26

Abstract

Penelitian ini dilatarbelakangi oleh pembangunan Pasar Sentral Kota Gorontalo yang dibangun pada tahun 2000 dan telah dilakukan renovasi pada tahun 2020. Untuk merespon hal tersebut dilakukan penelitian analisis kapasitas dukung fondasi berdasarkan in situ test. Untuk keperluan tersebut perlu dilakukan pengujian kapasitas dukung tanah pada daerah lokasi pembangunan Pasar Sentral Kota Gorontalo tersebut. Kapasitas dukung tanah dan penurunan pada fondasi sangat berkaitan erat dengan beban struktur yang di atasnya. Pada lokasi penelitian ini dilakukan pengujian kapasitas dukung pada tanah berupa pengujian sondir dan pengujian N-SPT. Berdasarkan dari hasil uji N-SPT dilakukan analisis kapasitas dukung pada fondasi serta penurunan yang terjadi dan kemudian dianalisis dengan metode elemen hingga (Plaxis 2D). Hasil penelitian menunjukkan kapasitas dukung tanah pada titik BH.1 termasuk dalam kategori tanah dengan kapasitas dukung tanah lunak, sedangkan untuk kapasitas dukung tanah pada titik BH.2 termasuk dalam kategori kapasitas dukung tanah padat. Setiap lokasi memiliki nilai kapasitas dukung dan penurunan yang berbeda dikarenakan dari kedua lokasi BH memiliki tanah yang berbeda. Titik BH.2 memiliki nilai penurunan paling kecil yaitu sebesar 2,66 mm karena nilai kapasitas dukung tanahnya sangat besar. Semakin kecil kapasitas dukung pada tanah maka akan semakin besar penurunan yang akan terjadi pada bangunan. Semakin besar tekanan yang dipikul fondasi maka peluang untuk bangunan mengalami penurunan sangatlah besar.
PENGARUH LAMA RENDAMAN DAN PENUAAN ASPAL TERHADAP NILAI DURABILITAS CAMPURAN ASPAL COLD PAVING HOT MIX ASBUTON (CPHMA) Ardhy Prathama; Fadly Achmad; Frice L. Desei
Composite Journal Vol. 2 No. 1 (2022): Composite Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/cj.v2i1.39

Abstract

CPHMA adalah aspal siap pakai dan bisa dihampar dengan menggunakan suhu ruang. Kerusakan jalan pada permukaan sering terjadi karena proses penuaan aspal. Berdasarkan hal tersebut perlu dilakukanya penelitian mengenai keawetan campuran aspal (Durabilitas) dan pengaruh penuaan aspal guna mengetahui kekuatan dan masa pelayanan dari aspal CPHMA. Pembuatan benda uji pada penuaan aspal jangka pendek (Short-Term Oven Aging, (STOA) dilakukan dengan cara memasukkan benda uji dalam keadaan curah ke dalam oven selama 4 jam dengan suhu 135°C, sedangkan untuk penuaan jangka panjang (Long-Term Oven Aging, LTOA) dilakukan dengan cara memasukkan benda uji ke dalam oven dalam keadaan padat selama 2 hari untuk masa pelayanan 5 tahun dan 3 hari untuk masa pelayanan 10 tahun. Parameter keawetan campuran CPHMA dilihat dari Indeks Kekuatan Sisa (IKS), Indeks Durabilitas Pertama (IDP), dan Indeks Durabilitas Kedua (IDK). Berdasarkan hasil penelitian nilai kadar aspal CPHMA yang diperoleh melalui hasil ekstraksi adalah sebesar 7,05%. Nilai stabilitas untuk benda uji normal, LTOA 5 tahun, LTOA 10 tahun, dan STOA secara berturut-turut sebesar 634,61 kg, 504,58 kg, 451,21 kg, dan 1.261,45 kg. Nilai IKS pada benda uji normal sebesar 95,41%, pada benda uji LTOA 5 tahun dan 10 tahun secara berturut-turut sebesar 85,58% dan 84,95%. Nilai IKS pada benda uji STOA sebesar 96,15%. IDP dengan nilai kelandaian r pada rendaman 24 jam untuk benda uji normal, LTOA 5 tahun, LTOA 10 tahun dan STOA secara berturut-turut sebesar 1,49%, 1,66%, 1,81%, dan 0,16%. IDK benda uji normal, LTOA 5 tahun, LTOA 10 tahun dan STOA untuk nilai a secara berturut-turut sebesar 14,32%, 23,20%, 23,89%, dan 1,88%. Lama rendaman sangat berpengaruh terhadap nilai stabilitas yang diperoleh, semakin lama rendaman maka semakin rendah nilai stabilitas yang didapatkan. Hasil penelitian menunjukkan bahwa aspal CPHMA hanya diperuntukkan untuk kendaraan ringan hingga sedang.
KARAKTERISTIK MARSHALL CAMPURAN ASPHALT CONCRETE BINDER COURSE (AC-BC) MENGGUNAKAN ASBUTON PRACAMPUR DAN AGREGAT GORONTALO Prasetiyo, Eko; Desei, Frice L.; Achmad, Fadly
Composite Journal Vol. 4 No. 1 (2024): Composite Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/cj.v4i1.42

Abstract

Indonesia memiliki cadangan aspal alam terbesar di dunia berupa aspal gunung, dikenal sebagai asbuton, yang terdapat di Pulau Buton, Provinsi Sulawesi Tenggara. Penelitian ini bertujuan untuk menganalisis karakteristik asbuton pracampur dan agregat Gorontalo serta karakteristik Marshall campuran AC-BC menggunakan kedua bahan tersebut. Metode yang digunakan adalah Marshall Test untuk memastikan campuran aspal panas memenuhi spesifikasi teknik Direktorat Jenderal Bina Marga. Aspal buton pracampur memiliki berat jenis 1,036, nilai penetrasi 54 mm, titik lembek 55,5°C, dan hasil ekstraksi menunjukkan 98% bitumen dan 2% mineral. Karakteristik agregat meliputi: Coarse Aggregate (CA) dengan berat jenis 2,56, nilai abrasi 24,84%, nilai angularitas 99,32/98,84%, absorpsi 1,27%, kelekatan agregat terhadap aspal >95%, dan material lolos saringan No.200 sebesar 0,6%. Medium Aggregate (MA) memiliki berat jenis 2,54, nilai abrasi 27,51%, nilai angularitas 99,32/98,84%, absorpsi 1,74%, kelekatan agregat terhadap aspal >95%, dan material lolos saringan No.200 sebesar 0,9%. Fine Aggregate (FA)/abu batu memiliki berat jenis 2,42, absorpsi 1,32%, sand equivalent 75,76%, dan material lolos saringan No.200 sebesar 9,92%. Pasir memiliki berat jenis 2,40, absorpsi 2,28%, dan material lolos saringan No.200 sebesar 2,03%. Semua nilai karakteristik aspal dan agregat memenuhi Spesifikasi Umum 2018 (Revisi 2). Nilai KAO AC-BC asbuton pracampur adalah 5,25%. Karakteristik Marshall menggunakan KAO 5,25% menunjukkan kepadatan 2,22 gr/cm³, VIM 4,95%, VMA 14,63%, VFA 66,19%, stabilitas 1.310,20 kg, flow 2,54 mm, dan Marshall Quotient 515,83 kg/mm. Disimpulkan bahwa campuran asbuton pracampur dan agregat Gorontalo memiliki stabilitas tinggi, cocok untuk jalan yang melayani lalu lintas berat dan padat.
ANALISIS PENGARUH TINGKAT PENDIDIKAN TERHADAP KOMPETENSI PEKERJA KONSTRUKSI BANGUNAN GEDUNG DI PROVINSI GORONTALO Amala, Ikdal; Utiarahman, Arfan; Achmad, Fadly
Composite Journal Vol. 4 No. 1 (2024): Composite Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/cj.v4i1.64

Abstract

Most of the construction workers in Indonesia are only having experience-based knowledge. They are skilled but are only elementary school graduates. Only a small proportion are able to reach the high school level. This is a fundamental problem for construction workers in Indonesia because many of the construction workers lack in engineering knowledge. This is a descriptive qualitative study. The findings indicate that: 1) Field identification, referring to the 2016 and 2013 SKKNI, reveals that both respondents are still lacking in the application of Occupational Health and Safety (K3). 2) The utility factor values ​​of the two respondents are both above 50%, where the utility factor of the blacksmith is 63.96% with a work productivity ratio of 18.39 kg/hour, while the of carbon steel worker 63.42% with productivity work of 2.73 m2/hour. 3) Both respondents occupy the lower level in the IQF, where blacksmith is categorized at level 1 and carbon steel workers is categorized at level 2. 4) The education level of construction workers does not affect their competence. Most of the knowledge related to the guild profession is obtained from work experience factors.
TINJAUAN KARAKTERISTIK MARSHALL CAMPURAN ASPHALT CONCTRATE WEARING COURSE (AC-WC) MENGGUNAKAN LIMBAH PLASTIK POLY ETHYLENE THEREPHTHALATE (PET) Alkam, Moh. Alkam; Desei, Frice L.; Achmad, Fadly
Composite Journal Vol. 3 No. 1 (2023): Composite Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/cj.v3i1.68

Abstract

Asphalt mixtures have several disadvantages, such as permanent deformation caused by too heavy pressure by truckloads and cracks caused by heat and humidity. In addition, plastic wastes that are increasingly piling up provide opportunities to be used in asphalt mixtures to improve the performance of asphalt mixtures. Concerning this issue, research about the substitution of plastic waste in asphalt mixtures is highly essential to be conducted. Moreover, this research was performed by substituting plastic waste into the asphalt and then mixing it into aggregate. The asphalt weight was taken from optimum asphalt content, while the mixture process was performed at the temperature of + 170°C by employing a high-speed mixing technique to keep the temperature stable during the mixing process. In comparison, the compaction was conducted at the temperature of + 150-160°C. At the same time, the test object was made as many as 25 samples to determine the optimum asphalt content and 25 samples for a mixture of asphalt with plastic waste. The type of plastic used in this research was Polyethylene Terephthalate (PET), with a percentage of plastic waste contents of 0,3%; 0,6%; 0,9%; 1,2%, and 1,5%. The research finding obtained that the highest stability value was 1.176,06 kg at 1,2% plastic content. Specifically, the stability values that met the interim specifications for asphalt plastic mixture were 981,02 kg; 1.152,78 kg; and 1.176,06 kg at plastic contents of 0,6%, 0,9%; and 1,2%, respectively. The highest flow was 3,62 mm at 1,5% plastic content, and the highest MQ was 331,26 kg/mm at 0,9% plastic content. At the same time, the addition of plastic content tended to increase VIM in plastic asphalt mixtures. The VIM values were 3,79%; 4,10%, 4,19%; 4,29%; and 4,33%, respectively. Likewise, the addition of plastic contents could increase VMA values in asphalt mixture where the VIM values were 19,08%; 19,34%, 19,42%; 19,51%; and 19,52%, consecutively. In contrast, adding plastic content to the asphalt mixture could decrease VFA and density values. In detail, the VFA values were 80,15%; 78,81%; 78,41%; 77,99%,, and 77,82% respectively, whilst the consecutive density values were 2,32 gr/cm; 2,32 gr/cm'; 2,31 gr/cm; 2,31 gr/cm'; and 2,31 gr/cm. Based on this analysis result, it could be inferred that 1,2% plastic content was suitable for use in asphalt mixtures with a stability value of 1.176,06 kg. This value increased by 38% from the stability value of conventional asphalt mixtures.
KAJIAN DURABILITAS DAN PENUAAN ASPHALT CONCRETE-WEARING COURSE (AC-WC) ASBUTON PRACAMPUR TERHADAP VARIASI LAMA RENDAMAN Attamimi, Mohamad Faldi; Achmad, Fadly; Desei, Frice L.
Composite Journal Vol. 1 No. 1 (2021): Composite Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (497.488 KB) | DOI: 10.37905/cj.v1i1.17

Abstract

The fundamental problem in roads construction is the road damage that occurs before the road’s designted time is reached. Causes of such a damage consist of weather, water, temperature, or the reduction in the quality of pavement layers due the aging process. The manufacture of test object for Short-Term Oven Aging (STOA) was carried out by heating the test object in loose condition with 135°C of temperature for 4 hours before compaction, while the manufacture of test piece for Long-Term Oven Aging (LTOA) was carried out by heating the test object for 2 days in 85°C temperature after the specimen was compacted. The durability parameters of the AC-WC mixture was observed from Residual Streght Index (RSI), First Durability Index (FDI), and Second Durability Index (SDI). Based on the findings of Pre-Blended Buton Asphalt AC-WC mixture produced 6,0% of Optimum Bitumen Content (OBC). The RSI of the test object in normal, STOA, and LTOA obtained 97,11%, 94,82%, and 95,77% respectively. Furthermore, the FDI of the test object in normal, STOA, and LTOA obtained r value of 0,42%, 0,74%, and 0,60% respectively. Meanwhile, the SDI of the test in normal, STOA, and LTOA obtained a value of 4,87%, 9,75%, and 7,73% respectively. In addition, the Sa of the test object in normal, STOA, and LTOA in 96 hours of soaking were 95,13%, 90,25%, and 92,27% respectively. All in all, the finding showed that the AC-WC mixture with Pre-Blended Buton Asphalt in normal condition attained 72 hours of durability, while for the test specimen which is subjected to aging (STOA and LTOA) attained 48 hours of durability.
MIKRO ZONASI RESPON SPEKTRUM GEMPA DI KABUPATEN GORONTALO UTARA UNTUK KEBUTUHAN DESAIN BANGUNAN TAHAN GEMPA Aldo, Rivaldo Inaku; Achmad, Fadly; Patuti, Indriati Martha
Composite Journal Vol. 2 No. 2 (2022): Composite Journal
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/cj.v2i2.51

Abstract

The issuance of SNI 1726:2019 regarding the response of the earthquake spectrum in Indonesia has not accommodated districts and sub-districts. The distribution of values on the zoning map for Indonesia is only divided by province, including Gorontalo. Gorontalo province is included in the high-risk zone because its soil motion parameter Ss is maroon with a value of 1.2–1.5g, while the ground motion S1 parameter is light brown with a constant acceleration spectrum of 60% g, Thus, it is necessary to divide the micro-scale map of the earthquake response spectrum zonation. This research aimed to analyze the value of the earthquake spectrum created with a zoning micro map in Gorontalo Utara District. This research is expected to be an initial reference in planning for the earthquake-resilient building, particularly in Gorontalo Utara District. The object of research is located in Gorontalo Utara District. This research only used secondary data obtained from several agencies, namely, BPJN Gorontalo and drilling service companies in Gorontalo Province. The secondary data used is the result of SPT (Standard Penetration Test) driling. Preparation of spectrum responses and zonation micro map referred to the guidelines of SNI 1726:2019 and the QGIS learning module. The data analyzed are based on the N-SPT data, which previously had been processed. The data obtained were processed to obtain the value that became the goal of this research by correcting the N-SPT (Standard Penetration Test) data, making the earthquake response spectrum plan, and making the response spectrum using QGIS 3.16. Gorontalo Utara District is classified as a soft-to-moderate site with an value of 9-37. The short period bedrock acceleration value SS is 1.49-2.33g. When viewed by color, Gorontalo Utara District is including in maroon to purple. The value of 1 second bedrock acceleration period S1 is 0.6-0.78. When viewed by color, it is including whitish orange to pink. The peak ground acceleration value PGA is 1.49-2.33g which, by color, is included in yellowish orange to red. The value of bedrock acceleration for a period of 1 second and the highest peak ground acceleration value occurred in Ilangata Village with SS values ​​of 2.12-2.33g, S1 0.74-0.78g and PGA values ​​0.79-0.85g. Meanwhile, the lowest value occurred in Deme 2 Village with an SS value of 1.49g, S1 0.6g and a PGA value of 0.6g. It shows that the higher the acceleration value, the greater the earthquake that occurs, and vice versa. Based on the results of this study, the acceleration value affects the estimation of the earthquake that occurs, or the acceleration is directly proportional to the force.
Co-Authors abdul Djou Agung, Riski Dewa Ahmad Rifqi Asrib Akadira, Tora Aldo, Rivaldo Inaku Alkam, Moh. Alkam Amala, Ikdal Amir, Nur Hikmah Ardhy Prathama Arfan Utiarahman Arfin Sudirman Arip Mulyanto Attamimi, Mohamad Faldi Azhar Balu, Rasyid Desei, Frice Dolly Indra Eko Prasetiyo Frice L Desei Frice L. Desei, Frice L. Husain Syam Imran Kaaba Indriati Martha Patuti Kholil, Syukur lilis nurhayati Mukarramah, Rifqatul Ria Defriyanti Ali Riau, Dwi Putranto Riskiyanto Maksud, Riskiyanto Sampurna, Ahmad Satma, Satma Sofiani, Anggi