Mustofa, Mohammad Fajar Satria Agung (2026) Pengaruh Subtitusi Semen dengan Nanosilika dan Tambahan Limbah Polyethylene Terephthalate (PET) Terhadap Kuat Lentur, Kuat Tekan, dan Kuat Lekat Sebagai Material Perbaikan Struktur Beton. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Kerusakan pada struktur beton menuntut material perbaikan yang tidak hanya memiliki kekuatan mekanis yang memadai, tetapi juga kemampuan lekat yang baik terhadap beton eksisiting serta biaya yang murah. Pemanfaatan nanosilka sebagai material pozzolanik dan limbah Polyethyene Terephthalate (PET) sebagai serat berpotensi memenuhi kebutuhan tersebut sekaligus mengurangi limbah plastik. Penelitian ini bertujuan untuk menganalisis pengaruh subtitusi nanosilika dan lenambahan serat PET terhadap kuat tekan, kuat lentur, dan kuat lekat beton sebagai material perbaikan, serta membandingkan biayanya dengan material perbaikan komersial. Lima variasi campuran yang diuji yaitu NS0P0 (beton normal), NS3P0 (nanosilika 3%), NS0P1 (fiber PET 1%), NS3P1 (kombinasi nanosilika 3% dan PET 1%), dan FCS (fiber consol 1%), dengan mutu rencana 35 MPa. Kuat tekan diuji pada umur 3 jam, 1 hari, 7 hari dan 28 hari mengacu pada ASTM C39, kuat lentur pada balok utuh mengikuti ASTM C78, dan kuat lekat (flexural bond strength) pada balok komposit substret-overlay, dengan evaluasi terhadap kriteria material perbaikan ASTM C928/928M. Hasil menunjukkan bahwa substitusi nanosilika meningkatkan kuat tekan, tertinggi pada NS3P0 (42,2 MPa) diikuti NS3P1 (41,5 MPa) pada umur 28 hari, sementara nanosilika juga mempercepat perkembangan kekuatan awal. Sebaliknya, kuat lentur tertinggi dicapai beton normal (6,18 MPa), sedangkan NS3P0 terendah (4,71 MPa) diduga akibat sifat getas; penambahan serat membantu mempertahankan kuat lentur melalui mekanisme penahan retak. Pada kuat lekat, NS3P1 menghasilkan nilai tertinggi (1,911 MPa) dengan seluruh keruntuhan terjadi pada bidang antarmuka (bond interface), yang menunjukkan bidang sambungan sebagai bagian terlemah sistem komposit. Berdasarkan kuat lekat sebagai parameter terpenting material perbaikan, NS3P1 dinilai sebagai variasi terbaik meskipun sebaran hasilnya relatif lebar. Dari sisi biaya, seluruh variasi penelitian jauh lebih ekonomis, dengan NS3P1 lebih murah sekitar 63% dibandingkan material komersial termurah. Penelitian ini menunjukkan bahwa material perbaikan berbasis nanosilika dan limbah PET memiliki potensi dari segi teknis dan ekonomi sebagai alternatif material perbaikan struktur beton.
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Damage to concrete structures demands repair materials that possess not only adequate mechanical strength but also good bonding capability to the existing concrete, as well as economical cost. The use of nanosilica as a pozzolanic material and polyethylene terephthalate (PET) waste as fiber has the potential to meet these requirements while reducing plastic waste. This study aims to analyze the effect of nanosilica substitution and the addition of PET fiber waste on the compressive, flexural, and bond strength of concrete as a repair material, and to compare its cost with commercial repair materials. Five mixture variations were tested, namely NS0P0 (normal concrete), NS3P0 (3% nanosilica), NS0P1 (1% PET fiber), NS3P1 (combination of 3% nanosilica and 1% PET), and FCS (1% consol fiber), with a design strength of 35 MPa. Compressive strength was tested at 3 hours, 1 day, 7 days, and 28 days in accordance with ASTM C39/C39M, flexural strength on solid beams following ASTM C78, and flexural bond strength on substrate–overlay composite beams, evaluated against the ASTM C928/C928M repair material criteria. The results show that nanosilica substitution increased compressive strength, highest in NS3P0 (42.2 MPa) followed by NS3P1 (41.5 MPa) at 28 days, while nanosilica also accelerated early-age strength development. Conversely, the highest flexural strength was achieved by normal concrete (6.18 MPa), while NS3P0 was the lowest (4.71 MPa) presumably associated with its brittle nature; the addition of fiber helped maintain flexural strength through a crack-bridging mechanism. For bond strength, NS3P1 produced the highest value (1.911 MPa), with all failures occurring at the bond interface, indicating the joint plane as the weakest part of the composite system. Based on bond strength as the most critical parameter for repair materials, NS3P1 was assessed as the best variation despite its relatively wide result distribution. In terms of cost, all research variations were far more economical, with NS3P1 approximately 63% cheaper than the least expensive commercial material. This study demonstrates that nanosilica- and PET-waste-based repair materials have technical and economic potential as an alternative for concrete structural repair.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Beton Perbaikan, Nanosilika, Limbah PET, Kuat Lekat, Kuat Lentur, Repair Concrete, Nanosilica, PET Waste, Flexural Strength, Bond Strength |
| Subjects: | T Technology > T Technology (General) 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) > TA681 Concrete construction |
| Divisions: | Faculty of Vocational > 22301-Civil Infrastructure Engineering (D4) |
| Depositing User: | Moch Fajar Satria Agung Mustofa |
| Date Deposited: | 03 Aug 2026 01:16 |
| Last Modified: | 03 Aug 2026 01:16 |
| URI: | http://repository.its.ac.id/id/eprint/141479 |
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