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Mohd. Isneini
Universitas Lampung
Civil Engineering, Building, Construction & Architecture Other

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KERUSAKAN DAN PERKUATAN STRUKTUR BETON BERTULANG Isneini, Mohd.
Rekayasa : Jurnal Ilmiah Fakultas Teknik Universitas Lampung Vol 13, No 3 (2009): Edisi Desember Tahun 2009
Publisher : UNIVERSITAS LAMPUNG

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Concrete made with Portland cement has been a popular constructing material all over the worldfor the past 180 years or more. However, cement mortar and concrete have some disadvantagessuch as delayed hardening, low tensile strength, low chemical resistance, large drying shrinkage.To reduce these advantages, many attemps to use polymers have been made. One such attemps ispolymer-modified (or polymer cement) mortar or concrete, which is made by modifying ordinaryportland cement with polymer additives such as latexes, redispersible polymer powders, watersoluble polymer, liquid resin and monomers. In this paper will be introduced Types of damagesoccurred to Reinforced concrete structures, method of repaired and usage of polimer concrete asa material used for repairation. In Indonesia polymer concrete is not common yet to use asconcrete mass because the cost needed to produce it is still high, so usage polimer for repairing isa choice to make it popular as a contruction material.
Pengaruh komposisi penambahan serat polypropylene terhadap kuat tekan dan kuat lentur self compacting mortar (SCM) Suma, Damas Novalda; Noorhidana, Vera Agustriana; sebayang, surya; Isneini, Mohd.
Jurnal Rekayasa Sipil dan Desain Vol 11, No 1 (2023): Edisi Maret 2023
Publisher : Jurnal Rekayasa Sipil dan Desain

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AbstractSelf compacting mortar is a mortar which is able to flow under its own weight and completely fill the formwork without the need for external compaction, while maintaining its homogeneity. This study aims to determine the effect of variations in the addition of polypropylene fiber to the compressive strength and flexural strength of self compacting mortar (SCM), as well as to determine the optimum variation of the addition of polypropylene fiber in mixed mortar. In this study, the test specimens were made with a water-cement factor of 0.4 and the ratio between cement and fine aggregate was 1:2.5 and the addition of 2% superplasticizer by weight of cement and the addition of polypropylene fibers with variations of 0%, 0.04%, 0.06%, 0.08%, 0.1% of the volume of the mortar test object. Tests were carried out on specimens aged 28 days. The results showed that the compressive strength of SCM experienced an optimum increase in the addition of 0.04% polypropylene fiber which was 34.81 MPa with an increase percentage of 14.07% of mortar without fiber, while the flexural strength of SCM increased with increasing variations of polypropylene fiber until the increase The optimum variation occurred at 0.1% polypropylene fiber, namely 11.72 MPa with a percentage increase of 26.05% from mortar without fiber. Key words : polypropylene fiber, superplasticizer, compressive strength, flexural strength.
Analisis Variasi Layout Shearwall Dengan SNI 1726-2019 Terhadap Perilaku Bangunan Bertingkat (Studi Kasus: Gedung Pelayanan Publik Satu Atap Bandar Lampung) Setiawan, Andi; Isneini, Mohd.; Noorhidana, Vera Agustriana; Husni, Hasti Riakara
Jurnal Rekayasa Sipil dan Desain Vol 11, No 2 (2023): Edisi Juni 2023
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Earthquake resistant buildings are not designed only by strengthening the resistance of the structure, but are also designed to reduce earthquake forces. One of the structural reinforcement elements that can reduce earthquake forces is shearwall. The variation of shearwall layout will have a different effect on the performance level of the structure. This study aims to determine the performance level of the structure with a variety of shearwall layouts in a building structure model using the pushover analysis method. Determining the level of structural performance using pushover analysis is carried out using the help of structural analysis programs based on SNI 1726-2019, SNI 1727-2020, SNI 2847-2019 and ATC-40. From the research results it was found that the structural performance level according to ATC-40 (1996), for model 1 and model 6 were included in the damage control category, while for model 2, model 3, model 4 and model 5 were included in the immediate occupancy category. Placement of shearwall which has the optimum value according to ATC-40 for the X direction occurs in model 2 with the shearwall installed in an L shape which is placed near the center of mass of the building. Whereas in the Y direction it occurs in model 3 with the shearwall installed in an L shape which is placed away from the center of mass of the building. Key words : shearwall, model, structure performance level, pushover analysis.
Pengaruh Air Payau Terhadap Kuat Tekan Beton dengan Semen PCC Nugraha, Aditya Wisnu; Niken, Chatarina; Wahono, Endro Prasetyo; Isneini, Mohd.
Jurnal Rekayasa Sipil dan Desain Vol 11, No 4 (2023): Edisi Desember 2023
Publisher : Jurnal Rekayasa Sipil dan Desain

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AbstractConcrete is a type of construction that is widely used today, one of which is water building infrastructure. Concrete must be resistant to various environmental conditions, such as brackish water. Brackish water is an aggressive environment with chemical contents that can interfere with the compressive strength of concrete. Currently, PCC type cement (Portland Composite Cement) tends to be more widely used than OPC (Ordinary Portland Cement) because the price is cheaper and more environmentally friendly, which has an impact on global warming. The aim of this research is to determine the impact of the aggressive environment of brackish water on the compressive strength of concrete with PCC cement. 18 cylindrical test objects with a diameter of 15 cm and a height of 30 cm were used, which were divided into two types of tests, namely protected concrete and concrete submerged in brackish water. Each test is carried out with three test objects at concrete ages of 28 days, 56 days, and 90 days. The data obtained was then analyzed using the Dixon criteria in accordance with ASTM E 178-02. Compressive strength testing is obtained from the Compression Testing Machine (CTM). The research results show that brackish water has a negative impact on the compressive strength of concrete. At the age of 28 days, the concrete submerged in brackish water reaches its design compressive strength. However, at 56 days and 90 days, the concrete experienced a decrease in compressive strength compared to protected concrete. This is because there is chloride and sulfate content in brackish water, which can damage the structure in the concrete.Keywords : brackish water, compressive strength, concrete, PCC. AbstrakBeton merupakan jenis konstruksi yang banyak digunakan saat ini salah satunya tiang pancang pada dermaga. Beton harus tahan terhadap berbagai kondisi lingkungan seperti air payau. Air payau adalah lingkungan agresif dengan kandungan kimia yang dapat mengganggu kuat tekan beton. Saat ini, semen jenis PCC (Portland Composite Cement) cenderung lebih banyak digunakan dibanding OPC (Ordinary Portland Cement) karena harganya yang lebih murah dan lebih ramah lingkungan karena pemanasan global. Tujuan penelitian ini adalah mengetahui dampak lingkungan agresif air payau terhadap kuat tekan beton dengan semen PCC. Digunakan 18 buah benda uji silinder dengan ukuran diameter 15 cm dan tinggi 30 cm yang terbagi menjadi dua jenis pengujian yaitu beton terlindung dan beton terendam air payau. Dimana setiap pengujian dilakukan dengan 3 buah benda uji pada umur beton 28 hari, 56 hari dan 90 hari. Dari data yang diperoleh kemudian dianalisis dengan kriteria dixon sesuai dengan ASTM E 178-02. Pengujian kuat tekan didapat dari alat Compression Testing Machine (CTM). Hasil penelitian menunjukkan bahwa air payau berdampak negatif terhadap kuat tekan beton. Pada umur 28 hari, beton terendam air payau mencapai kuat tekan rencananya. Namun, pada umur 56 hari dan 90 hari beton mengalami penurunan kuat tekan jika dibanding dengan beton terlindung. Hal ini dikarenakan terdapat kandungan klorida dan sulfat pada air payau yang dapat merusak struktur didalam beton.Kata kunci : air payau, beton, kuat tekan, PCC.
Studi Perbandingan Beban Gempa Pada Gedung Rawat Inap Non Bedah RSUD Dr. H. Abdul Moeloek, Bandar Lampung Dengan Analisis Respon Spektrum Sesuai SNI 1726:2012 dan SNI 1726:2019 Hania Cipta, Ade Permata; Isneini, Mohd.; Husni, Hasti Riakara; Kusnadi, Andi
Jurnal Rekayasa Sipil dan Desain Vol 11, No 2 (2023): Edisi Juni 2023
Publisher : Jurnal Rekayasa Sipil dan Desain

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The rapidly growing population is directly proportional to the increasing amount of land use, especially in urban areas, one of which is in the city of Bandar Lampung. The construction of vertical structures or high-rise building structures is an option in overcoming the limited land. However, high-rise building structures are considered to be risky to lateral loads such as earthquake loads, so that in planning, earthquake loads must be considered.This study aims to determine differences in response to the earthquake acceleration spectrum in the City of Bandar Lampung, especially the Non-Surgical Inpatient Building at Dr. H. Abdul Moeloek based on SNI 1726:2012 and SNI 1726:2019. Based on the results of this study, it was found that due to the influence of the earthquake the input spectrum response was in accordance with SNI 1726:2012 and SNI 1726:2019, the base shear force due to the earthquake spectrum response for SNI 1726:2012 was 12900.4864 kN and SNI 1726:2019 was 14931.0787 kN . Interstory drift between levels that occur in the structure are still in the safe category because they do not exceed the story drift allowable levels, 48.4615 mm.
Pengaruh Penggunaan Ordinary Portland Cement (OPC), Semen Modifikasi Jenis III dan Jenis IV, dan Portland Composite Cement (PCC) Terhadap Kuat Tekan Beton Prameswari Tw, Aqilla Regita; Irianti, Laksmi; Sebayang, Surya; Isneini, Mohd.
Jurnal Rekayasa Sipil dan Desain Vol 11, No 4 (2023): Edisi Desember 2023
Publisher : Jurnal Rekayasa Sipil dan Desain

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Abstract Cement is one of the main materials used in making concrete. Cement is useful as a hydraulic binder when mixed with water. Based on the differences in usage characteristics and properties of cement, this research will discuss the effect of using OPC cement (type I), modified cement (type III and type IV), and PCC cement to see how the compressive strength of concrete develops over time with testing periods of 3 days, 7 days, 14 days, and 28 days. The research method used is an experimental study aimed at obtaining a comparison of compressive strength of concrete using OPC and PCC cement. The test specimens used are cylindrical in shape (diameter 150 mm and height 300 mm) with a total of 48 samples with 4 variations, each consisting of 3 samples. The planned concrete quality is 25 MPa. The highest compressive strength of concrete at 3 days, 7 days, 14 days, and 28 days is obtained by OPC cement, modified cement type III, PCC cement, and modified cement type III, while the lowest compressive strength of concrete at 3 days, 7 days, 14 days, and 28 days is obtained by modified cement type IV. Key words : cement, OPC cement, PCC cement, modified cement, compressive strength. AbstrakSemen merupakan salah satu bahan utama dalam pembuatan beton. Semen berguna sebagai perekat hidrolis ketika dicampur dengan air. Berdasarkan perbedaan karakteristik penggunaan dan sifat pada semen, maka penelitian ini akan membahas mengenai pengaruh penggunaan semen OPC (jenis I), semen modifikasi (jenis III dan jenis IV), dan semen PCCuntuk melihat bagaimana kuat tekan beton terhadap perkembangan umur beton dengan waktu pengujian beton berumur 3 hari, 7 hari, 14 hari, dan28 hari. Metode penelitian yang akan dilakukan adalah studi eksperimental yang bertujuan untuk mendapatkan hasil perbandingan kuat tekan beton pada semen OPC dan semen PCC. Benda uji yang digunakan berbentuk silinder (diameter 150 mm dan tinggi 300 mm) dengan sampel sebanyak 48 buah dengan 4 variasi yang masing-masing terdiri dari 3 sampel. Mutu beton yang direncanakan, yaitu 25 MPa. Kuat tekan beton terbesar pada umur 3 hari, 7 hari, 14 hari, dan 28 hari secara berturut diperoleh oleh semen OPC, semen modifikasi jenis III, semen PCC, dan semen modifikasi jenis III, sedangkan kuat tekan beton terkecil pada umur 3 hari, 7 hari, 14 hari, dan 28 hari diperoleh oleh semen modifikasi IV. Kata kunci : semen, semen OPC, semen PCC, semen modifikasi, kuat tekan.
Finite Element Analysis on Reinforced Concrete Beams Strengthened with GFRP (Glass Fiber Reinforced Polymer) Using Software Surahman, Ridho; Isneini, Mohd.; Alami, Fikri
Jurnal Rekayasa Sipil dan Desain Vol. 8 No. 1 (2020): Edisi Maret 2020
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v8i1.1285

Abstract

In testing reinforced concrete beams strengthened with 4 layers of GFRP can increase the maximum load up to 112% (Nalarita, 2019). The test can be done by modeling using finite element based software.The beam that is modeled has a dimension of 1,7 m long, 15 cm wide and 15 cm high with 4 layers of 1,3 mm/layer GFRP. The beams that are modeled are only a quarter section because of symmetrical geometry and loading.The percentage difference between the results of modeling and experimental tests on normal beams is 1,49% for deflection in the middle span. The crack that occurs in normal beams in modeling and experimental shows the same crack pattern, which is flexural crack. The percentage difference between modeling and experimental tests on the strengthened beam is 21,81% for the deflection in the middle span. In experimental and modeling tests, the applied GFRP undergoes debonding before the concrete compressive strain reaches its ultimate strain.Keywords: Concrete, GFRP, debonding, modeling
Studi Numerik Perkuatan Balok Beton Bertulang dengan Mengkombinasikan Penggunaan GFRP dan Wire Mesh pada Beton Mutu Normal Agustina, Nadia; Isneini, Mohd.; Alami, Fikri
Jurnal Rekayasa Sipil dan Desain Vol. 8 No. 2 (2020): Edisi Juni 2020
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v8i2.1301

Abstract

Pada penelitian ini meneliti dua jenis balok yaitu balok beton bertulang normal tanpa perkuatan yang dijadikan balok kontrol (BN) dan balok beton bertulang dengan perkuatan lentur kombinasi GFRP dan Wire mesh (GGWW). Dalam memodelkan beton dan GFRP dideskripsikan sebagai elemen solid, kemudian untuk model baja tulangan dan wire mesh sebagai elemen truss dan model epoksi sebagai elemen cohesive. Interaksi yang diberikan pada hubungan antara baja tulangan dan beton serta hubungan antara epoksi dan wire mesh menggunakan teknik interaksi embedded region kemudian pada hubungan lapisan perkuatan dan lapisan epoksi menggunakan teknik interaksi tie constraint. Berdasarkan input beban maksimum hasil eksperimental, perbedaan persentase lendutan pada model balok BN sebesar 0,79% antara model numerik dan eksperimental kemudian pada model balok GGWW adalah sebesar 31,5%. Pola retak pada model balok BN numerik dan eksperimental menunjukkan tipe retak lentur keseluruhan dan pada model balok GGWW terjadi kegagalan lekatan antara serat beton dan perkuatan (debonding). Kata kunci : perkuatan, lendutan, regangan, debonding.
Investigasi dan Retrofitting Struktur Balok dan Kolom Beton Bertulang dengan Glass Fiber Reinforced Polymer (Gfrp) Clever, Arnaldo; Alami, Fikri; Isneini, Mohd.
Jurnal Rekayasa Sipil dan Desain Vol. 8 No. 2 (2020): Edisi Juni 2020
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v8i2.1308

Abstract

Bangunan Rumah Sakit Pendidikan Universitas Lampung sudah cukup lama terhenti dan terbengkalai pembangunannya, sehingga memunculkan kekhawatiran akan kekuatan eksisting yang ada jika pembangunan dilakukan kembali. Oleh sebab itu, perlu dilakukan evaluasi dan perkuatan struktur untuk meningkatkan kekuatan dan kelayakan bangunan tersebut.Ada dua metode yang digunakan dalam mengevaluasi bangunan ini yaitu metode survey langsung di lapangan dan metode analisis menggunakan program berbasis FEA. Untuk perhitungan perkuatan digunakan peraturan American Concrete Institute (ACI 440.2R, 2008). Sedangkan material utama perkuatannya digunakan Glass Fiber Reinforced Polymer (GFRP).Dari hasil pengolahan data, didapatkan 46,5% dari 43 balok lantai 1 yang ditinjau membutuhkan perkuatan di daerah lentur dan 21,95% dari 41 kolom basement dan lantai 1 yang ditinjau membutuhkan perkuatan di daerah aksial. Pada perhitungan perkuatan balok lentur didapatkan paling banyak 7 lapis material GFRP dan 6 lapis untuk material CFRP. Sedangkan pada perhitungan perkuatan kolom aksial didapatkan paling banyak 8 lapis GFRP dan 7 lapis untuk material CFRP. Element struktur balok lentur yang diperkuat pada penelitian ini memiliki tipe keruntuhan tarik dan untuk struktur kolom aksial yang diperkuat memiliki tipe keruntuhan tekan. Kata kunci :    Evaluasi Struktur, Perkuatan Struktur, GFRP, Balok  dan  Kolom
Kinerja Kuat Geser Interface Beton Lama (Substrate) Dan Beton Baru (Overlay) Dengan Variasi Sudut Kemiringan Dan Volume Fraksi Serat Baja Hussein, Imam; Noorhidana, Vera Agustriana; Isneini, Mohd.
Jurnal Rekayasa Sipil dan Desain Vol. 8 No. 3 (2020): Edisi September 2020
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jrsdd.v8i3.1385

Abstract

Dalam suatu pekerjaan struktur seringkali dijumpai pekerjaan perbaikan atau perkuatan struktur beton. Permasalahan yang sering muncul pada pekerjaan perbaikan atau perkuatan struktur terletak pada lekatan antara beton lama dan baru, dimana pertemuan (interface) merupakan bagian terlemah dari struktur. Penelitian ini bertujuan untuk mengetahui kinerja kuat geser lekatan interface antara beton lama (substrate) dengan beton baru (overlay) dengan variasi sudut kemiringan dan volume fraksi serat baja pada beton baru. Metode yang digunakan adalah metode Slant Shear Test, dengan menggunakan benda uji berbentuk prisma dengan dimensi 150 x 150 x 300 mm. Terdapat 2 variasi yang digunakan yaitu, (1) variasi sudut kemiringan 30°,45°, dan 70°dan (2) variasi campuran serat baja pada lapis overlay sebesar 0%, 0,5%, 1% dan 1,5%. Pada setiap variasi dibuat benda uji kuat tekan (kubus 150 x 150 x 150) dan kuat tarik lentur (balok 100 x 100 x 400). Dari hasil penelitian dapat disimpulkan bahwa 1) Kemiringan interface antara beton lama dan beton baru terhadap arah beban tekan mempengaruhi kuat geser lekatan antara beton lama dan beton baru, 2) Penambahan serat baja dalam beton overlay dapat meningkatkan kuat lekatan antara beton lama-baru dan kuat tarik lentur beton.  Kata kunci : kuat geser, interface, substrate, overlay, kuat tarik lentur.
Co-Authors Agustina, Nadia Andi Kusnadi Andi Setiawan Anggraeni, Sylvia Dewi Asmara, Kabul Budi Bayzoni Bayzoni, Bayzoni Clever, Arnaldo D.W.S.B.U, Chatarina Niken Endro Prasetyo Wahono Fikri Alami Firdha, Risty Amelia Hania Cipta, Ade Permata Hasti Riakara Husni Hussein, Imam Karima, Fadila Amelia Laksmi Irianti Niken, Chatarina Novrian, Ridho Rizky Nugraha, Aditya Wisnu Prameswari Tw, Aqilla Regita Putra, Mayka Purnama Ratna Widyawati Satria, Fungky Andi Suma, Damas Novalda Surahman, Ridho Surya Sebayang Vera Agustriana Noorhidana