Fitri, Izzati Eka Nisa'ul (2026) Evaluasi Sifat Mekanis Beton Modifikasi Dengan Nanosilika Dan Serat PET Berdasarkan Pengujian Modulus Elastisitas, Poisson's Ratio Dan Kuat Tarik Belah Untuk Rehabilitasi Struktur. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Kebutuhan material beton berkinerja mekanis unggul menjadi krusial dalam mendukung rehabilitasi struktur infrastruktur yang mengalami degradasi, salah satunya melalui pemanfaatan limbah plastik Polyethylene Terephthalate (PET) sebagai material perbaikan (repair) berbasis nanosilika, misalnya untuk aplikasi concrete jacketing. Penelitian ini bertujuan mengevaluasi pengaruh substitusi nanosilika dan serat PET terhadap sifat mekanis serta bond strength beton hasil perbaikan, sekaligus menganalisis efisiensi biaya bahannya dibandingkan produk komersial. Pengujian dilakukan pada silinder beton umur 28 hari dengan empat variasi: OPC (kontrol), nanosilika 3% (NS3P0), serat PET 1% (NS0P1), dan kombinasinya (NS3P1), mencakup kuat tekan, modulus elastisitas, kuat tarik belah, dan bond strength. Rasio Poisson tidak dijadikan dasar simpulan karena keterbatasan instrumen regangan lateral. Menurut Kumar dkk. (2022), nanosilika memperbaiki mikrostruktur melalui reaksi pozzolanik dan filler effect, sementara Islam dkk. (2025) menyatakan serat PET meningkatkan daktilitas dan kontrol retak. Nanosilika 3% meningkatkan kuat tekan hingga 42,20 MPa (+18,5% terhadap OPC), namun menurunkan modulus elastisitas dan kuat tarik belah, dengan penyebab pasti yang belum dapat dipastikan karena hanya satu dosis diuji. Kombinasi NS3P1 meningkatkan seluruh parameter mekanis terhadap OPC, dengan rasio modulus 103,5%, berada dalam rentang kompatibilitas kekakuan praktis 80-120%. Pada bond strength, seluruh variasi mencapai nilai rata-rata di atas 2,80 MPa (kategori "excellent"), dengan efektivitas perbaikan (R) 91,48-97,38% terhadap OPC. Secara ekonomi, seluruh variasi menunjukkan potensi penghematan biaya bahan 63-85% dibandingkan produk komersial (di luar biaya aplikasi dan tenaga kerja). Secara keseluruhan, seluruh campuran repair berpotensi dikembangkan lebih lanjut sebagai material rehabilitasi struktur yang kompatibel secara mekanis dan ekonomis, setelah verifikasi tambahan terhadap shrinkage, pull-off/slant shear, kompatibilitas termal, permeabilitas, dan durabilitas interface.
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The need for concrete materials with superior mechanical performance is critical in supporting the rehabilitation of deteriorating infrastructure, including through the utilization of Polyethylene Terephthalate (PET) plastic waste as a nanosilica-based repair material, such as for concrete jacketing applications. This study aims to evaluate the effect of nanosilica and PET fiber substitution on the mechanical properties and bond strength of repaired concrete, and to analyze the material cost efficiency compared to commercial products. Tests were performed on 28-day concrete cylinders across four variations: OPC (control), 3% nanosilica (NS3P0), 1% PET fiber (NS0P1), and their combination (NS3P1), covering compressive strength, elastic modulus, splitting tensile strength, and bond strength (ASTM C496); Poisson's ratio data were not used as a basis for conclusions due to limitations of the lateral-strain instrument. According to Kumar et al. (2022), nanosilica improves the microstructure through pozzolanic reaction and filler effect, while Islam et al. (2025) note that PET fiber improves ductility and crack control. 3% nanosilica increased compressive strength up to 42.20 MPa (+18.5% over OPC), but decreased elastic modulus and splitting tensile strength, the exact cause of which could not be confirmed since only one dosage was tested. The NS3P1 combination improved all mechanical parameters relative to OPC, with an elastic-modulus ratio of 103.5%, within the practical 80-120% stiffness-compatibility range. In bond-strength testing, all variations achieved average values above 2.80 MPa ("excellent" category), with repair effectiveness (R) of 91.48-97.38% relative to OPC. Economically, all variations showed a potential material cost saving of 63-85% compared to commercial products (excluding application and labor costs). Overall, all repair mixtures show potential for further development as mechanically and economically compatible structural rehabilitation materials, pending additional verification of shrinkage, pull-off/slant shear, thermal compatibility, permeability, and interface durability.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Nanosilika, serat PET, Sifat Mekanis, Rehabilitasi Struktur Nanosilica, PET Fiber, Mechanical Properties, Structural Rehabilitation |
| Subjects: | H Social Sciences > HD Industries. Land use. Labor > HD9622 Cement. Concrete. Cement and concrete additives T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA418.16 Materials--Testing. T Technology > TA Engineering (General). Civil engineering (General) > TA433 Strength of materials. |
| Divisions: | Faculty of Vocational > 22301-Civil Infrastructure Engineering (D4) |
| Depositing User: | Izzati Eka Nisa'ul Fitri |
| Date Deposited: | 01 Aug 2026 03:38 |
| Last Modified: | 01 Aug 2026 03:38 |
| URI: | http://repository.its.ac.id/id/eprint/142081 |
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