Aziz, Muhammad Wildan (2022) Studi Perbandingan Daktilitas Dan Pola Keretakan Pada Struktur Beton Geopolimer Dan Struktur Beton Semen Portland Dengan Metode Elemen Hingga (Finite Element Method). Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Abu terbang (fly ash) merupakan limbah pengolahan batu bara di Indonesia dan masih belum banyak dimanfaatkan. Pada perkembangan teknologi material abu terbang yang notabene merupakan material pozzolan yang dapat dimanfaatkan sebagai bahan utama pembuatan beton geopolimer. Beton geopolimer yang memiliki ikatan formwork polimer yang berpotensi dijadikan material struktur beton bertulang dengan beberapa keunggulan.
Keunggulan beton geopolimer jika dibandingkan dengan beton semen portland yaitu : tahan pada lingkungan asam (tahan korosi), kuat lekat tulangan dengan material beton lebih baik, stabil pada temperature tinggi, nilai fracture energy lebih tinggi. Penelitian eksperimental terdahulu tersebut menimbulkan hipotesa bahwa nilai daktilitas dari beton geopolimer lebih baik dari beton semen portland.
Identifikasi kuat tarik dari beton geopolimer yang lebih baik, menimbulkan hipotesa bahwa keretakan dari beton geopolimer akan lebih sedikit jumlahnya jika dibandingkan dengan beton semen portland. Selain itu identifikasi karakteristik lentur daripada elemen balok beton bertulang menunjukkan bahwa kemampuan dari beton bertulang material geopolimer lebih baik daripada beton bertulang material semen portland. Identifikasi nilai daktilitas dan pola keretakan berdasarkan kuat tekan beton yang sama akan dilakukan dalam penelitian dengan metode elemen hingga menggunakan program bantu ATENA 3D.
Permodelan dalam software analysis ATENA 3D dilakukan setengah balok bertulang geometri dari rencana balok dikarenakan objek model simetris pada sumbu vertical. Permodelan pembebanan dengan kontrol perpindahan setiap 0.001 m. Tulangan baja beton dimodelkan sebagai wire dengan parameter kuat lekat. Tumpuan pinned didefinisikan pada permukaan balok yang tidak dapat bergerak kearah memanjang spesimen. Tumpuan roll yang dapat bergerak arah memanjang spesimen didefinisikan pada baja linear bagian bawah balok beton bertulang. Kontrol permodelan dengan penelitian terdahulu untuk memvalidasi bahwa analisa dengan metode elemen hingga sesuai, dengan rasio selisih nilai daktilitas antara finite element analysis dengan hasil eksperimental untuk GPC adalah sebesar 4.6% sedangkan untuk OPC sebesar 1.7%. Analisa struktur beton bertulang 2 spesimen antara OPC dan GPC pada kuat tekan sama yaitu 35 MPa dilakukan guna mengetahui perbandingan nilai daktilitas keduanya. Nilai daktilitas balok beton geopolymer (GPC) 23% lebih besar jika dibandingkan dengan nilai daktilitas balok beton semen portland (OPC). Nilai daktiltias yang didapatkan untuk spesimen GPC sebesar 4.53 sedangkan untuk spesimen OPC sebesar 3.67.
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Fly ash is a waste from coal processing in Indonesia and is still not widely used. In the development of fly ash material technology which incidentally is a pozzolan material that can be used as the main ingredient for making geopolymer concrete. Geopolymer concrete that has polymer formwork bonds has the potential to be used as a reinforced concrete structural material with several advantages.
The advantages of geopolymer concrete when compared to portland cement concrete are: resistant to acidic environments (corrosion resistance), better bond strength of reinforcement with concrete material, stable at high temperatures, higher fracture energy value. The previous experimental research led to the hypothesis that the ductility value of geopolymer concrete was better than portland cement concrete.
The identification of the tensile strength of geopolymer concrete is better, leading to the hypothesis that the cracks of geopolymer concrete will be less in number when compared to portland cement concrete. In addition, identification of the flexural characteristics of reinforced concrete beam elements indicates that geopolymer reinforced concrete is better than portland cement reinforced concrete. Identification of ductility values and crack patterns based on the same compressive strength of concrete will be carried out in research using the finite element method using the ATENA 3D program.
The modeling in the ATENA 3D analysis software is carried out by half a reinforced beam geometry from the beam plan because the model object is symmetrical on the vertical axis. Loading modeling with displacement control every 0.001 m. Concrete steel reinforcement is modeled as a wire with adhesive strength parameters. Pinned supports are defined on the surface of the beam that cannot move along the length of the specimen. Roll supports that can move in the longitudinal direction of the specimen are defined on the linear steel bottom of the reinforced concrete beam. Control the model with previous research to validate that the analysis using the finite element method is appropriate. The ratio of the difference in ductility values between finite element analysis and experimental results for GPC is 4.6% while for OPC it is 1.7%. Analysis of the reinforced concrete structure of 2 specimens between OPC and GPC at the same compressive strength of 35 MPa was carried out to determine the comparison of the ductility values. The ductility value of geopolymer concrete beam (GPC) is 23% greater than the ductility value of portland cement concrete beam (OPC). The ductility value obtained for the GPC specimen is 4.53 while for the OPC specimen it is 3.67.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Reinforced Concrete Beams, Geopolymer Materials and Portland Cement, Ductility Value, Crack Patterns, Balok Beton Bertulang, Material Geopolimer dan Semen Portland, Nilai Daktilitas, Pola Keretakan. |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA444 Reinforced concrete T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering) |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis |
| Depositing User: | MUHAMMAD WILDAN AZIZ |
| Date Deposited: | 06 Feb 2022 06:13 |
| Last Modified: | 06 Feb 2022 06:13 |
| URI: | http://repository.its.ac.id/id/eprint/92845 |
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