Identifikasi Perilaku Lapisan Antarmuka Perbaikan Beton dengan Material Perkuatan Polypropylene Fiber

Rismayanti, Intan (2025) Identifikasi Perilaku Lapisan Antarmuka Perbaikan Beton dengan Material Perkuatan Polypropylene Fiber. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kerusakan dini pada struktur beton merupakan permasalahan serius yang menuntut solusi perbaikan yang tidak hanya ekonomis, tetapi juga memiliki ketahanan jangka panjang guna menjaga fungsi dan keselamatan struktural. Penelitian ini mengevaluasi efektivitas penggunaan serat polypropylene (PP) sebagai material perkuatan dalam sistem mortar dua lapis untuk aplikasi retrofitting struktur beton. Fokus utama diarahkan pada identifikasi karakteristik mekanik dari variasi campuran mortar yang dimodifikasi serta pengaruh perlakuan antarmuka (interfacial treatment) meliputi permukaan polos, interlocking, bonding agent, dan kombinasinya, terhadap perilaku retak dan kekuatan ikatan antar lapisan (interfacial bond). Pengujian laboratorium dilakukan untuk menilai performa mekanik campuran mortar melalui uji kuat tekan, lentur, tarik belah, dan geser miring. Analisis perilaku retak dilakukan secara visual dan menggunakan metode Digital Image Correlation (DIC) untuk mengamati distribusi regangan dan pola keruntuhan secara detail selama proses pembebanan. Selain itu, simulasi numerik dengan pendekatan tiga dimensi berbasis Nonlinear Finite Element Analysis (3D-NLFEA) digunakan untuk memodelkan hubungan tegangan-regangan (stress-strain) serta menganalisis ketangguhan antarmuka yang terbentuk dari berbagai konfigurasi lapisan perbaikan. Pemodelan ini sekaligus berfungsi untuk mensimulasikan hasil eksperimental dan mengevaluasi efektivitas sistem mortar dua lapis dalam skenario pembebanan struktural. Hasil penelitian menunjukkan bahwa penambahan serat PP secara signifikan meningkatkan daktilitas, kapasitas lentur, serta ketahanan terhadap retakan, meskipun menyebabkan sedikit penurunan pada kekakuan awal. Kombinasi antara serat PP dan perlakuan antarmuka interlocking serta bonding agent terbukti efektif dalam memperkuat interfacial bonding, menghasilkan pola retakan yang lebih terkendali dan peningkatan kekuatan struktural yang lebih merata. Simulasi numerik menunjukkan kesesuaian yang baik dengan data eksperimental, memperkuat validitas pendekatan model yang digunakan. Dengan demikian, sistem mortar dua lapis yang diperkuat serat PP dan dirancang dengan konfigurasi antarmuka yang tepat dapat menjadi solusi retrofitting yang andal untuk meningkatkan integritas struktural beton eksisting secara berkelanjutan.
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Premature deterioration in concrete structures is a serious issue that demands repair solutions that are not only cost-effective but also durable in the long term to ensure structural functionality and safety. This study evaluates the effectiveness of polypropylene (PP) fiber as a strengthening material in a two-layer mortar system for retrofitting existing concrete structures. The focus is directed toward identifying the mechanical characteristics of modified mortar mixtures and examining the influence of interfacial treatments including plain surfaces, interlocking configurations, bonding agents, and their combinations on crack behavior and interfacial bond strength. Laboratory testing was conducted to assess the mechanical performance of the mortar mixtures through compressive strength, flexural strength, splitting tensile strength, and slant shear tests. Crack behavior was analyzed both visually and using the Digital Image Correlation (DIC) method to observe strain distribution and failure patterns in detail during the loading process. In addition, three-dimensional numerical simulations based on Nonlinear Finite Element Analysis (3D-NLFEA) were employed to model the stress–strain response and analyze the interfacial toughness developed through various repair layer configurations. These simulations also served to reproduce the experimental results and evaluate the effectiveness of the two-layer mortar system under structural loading scenarios. The results of the study demonstrate that the addition of PP fiber significantly improves ductility, flexural capacity, and crack resistance, although it slightly reduces the initial stiffness. The combination of PP fiber with interlocking surfaces and bonding agents was found to be effective in enhancing interfacial bonding, resulting in more controlled crack propagation and more uniform improvement in structural strength. The numerical simulations showed good agreement with the experimental data, supporting the validity of the adopted modeling approach. Therefore, the two-layer mortar system reinforced with PP fiber and designed with appropriate interfacial configurations offers a reliable retrofitting solution for sustainably improving the structural integrity of existing concrete.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Retrofitting, Fiber Polypropylene, Interfacial, 3D-NLFEA, Retrofitting, Fiber Polypropylene, Interfacial, 3D-NLFEA.
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA418.16 Materials--Testing.
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis
Depositing User:	Intan Rismayanti
Date Deposited:	25 Jul 2025 06:12
Last Modified:	25 Jul 2025 06:14
URI:	http://repository.its.ac.id/id/eprint/121411

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