Studi Eksperimental Perilaku Lentur dan Pola Retak Blaok Beton Bertulang HVFA dengan Perkuatan CFRP

Sekti, Bayu Anggoro (2026) Studi Eksperimental Perilaku Lentur dan Pola Retak Blaok Beton Bertulang HVFA dengan Perkuatan CFRP. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Produksi semen Portland berkontribusi terhadap emisi karbon, sehingga penggunaan fly ash dalam kadar tinggi perlu dikaji pada tingkat elemen struktur. Penelitian ini menganalisis perilaku lentur dan pola retak balok beton bertulang dengan beton High Volume Fly Ash (HVFA) 70% dan perkuatan Carbon Fiber Reinforced Polymer (CFRP). Lima balok berukuran 150 x 250 x 2000 mm diuji dengan pembebanan empat titik, yaitu Balok Normal (BN) dan Balok HVFA tanpa CFRP (BH) , Balok Normal dengan CFRP 1 buah (BN-C1) dan balok HVFA dengan satu buah pelat CFRP (BH-C1), serta Balok HVFA dengan dua buah pelat CFRP (BFA-C2). Pola retak diamati secara visual dan menggunakan Digital Image Correlation (DIC), kemudian hasil eksperimen dibandingkan dengan penelitian Rohman dkk. (2024) dan kapasitas lentur teoretis. Pada balok tanpa perkuatan, BFA mencapai beban maksimum 127,00 kN atau 12,20% lebih rendah daripada BN sebesar 144,65 kN. Kekakuan menurun dari 15,60 menjadi 14,38 kN/mm, sedangkan lendutan pada beban maksimum meningkat dari 20,83 menjadi 22,50 mm dan daktilitas meningkat dari 2,76 menjadi 3,00. Energi serapan BFA lebih rendah daripada BN yang mencapai 2.259,82 J. Satu pelat CFRP meningkatkan beban maksimum sebesar 21,86% pada beton normal dan 30,69% pada beton HVFA. Dua pelat CFRP pada BFA-C2 meningkatkan beban maksimum sebesar 46,72% terhadap BFA hingga 186,33 kN dan menurunkan lendutan pada beban maksimum menjadi 11,95 mm. Seluruh balok didominasi retak lentur, sedangkan balok berperkuatan menunjukkan indikasi debonding atau pelepasan selimut beton. Lokasi konsentrasi deformasi DIC secara umum sesuai dengan lokasi retak aktual. Perbandingan dengan Rohman dkk. menunjukkan kecenderungan berbeda akibat perbedaan mutu beton, dimensi, tulangan, dan konfigurasi pengujian. Rasio kapasitas eksperimen terhadap kapasitas teoretis sebesar 1,03-1,16 menunjukkan bahwa perhitungan teoretis memberikan hasil yang lebih konservatif.
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Portland cement production contributes to carbon emissions; therefore, the use of high-volume fly ash should be evaluated at the structural-member level. This study analyzes the flexural behavior and crack patterns of reinforced concrete beams made with 70% High Volume Fly Ash (HVFA) concrete and strengthened with Carbon Fiber Reinforced Polymer (CFRP). Five 150 x 250 x 2000 mm beams were tested under four-point loading: BN and BFA without CFRP, BN-C1 and BFA-C1 with one CFRP plate, and BFA-C2 with two CFRP plates. Crack development was observed visually and using Digital Image Correlation (DIC), while the experimental results were compared with Rohman et al. (2024) and theoretical flexural capacities. For the unstrengthened beams, BFA reached a maximum load of 127.00 kN, which was 12.20% lower than BN at 144.65 kN. Stiffness decreased from 15.60 to 14.38 kN/mm, whereas deflection at maximum load increased from 20.83 to 22.50 mm and ductility increased from 2.76 to 3.00. The absorbed energy of BFA was lower than that of BN, which reached 2,259.82 J. One CFRP plate increased the maximum load by 21.86% in normal concrete and 30.69% in HVFA concrete. Two CFRP plates on BFA-C2 increased the maximum load by 46.72% relative to BFA, reaching 186.33 kN, and reduced the corresponding deflection to 11.95 mm. All beams were dominated by flexural cracking, while the strengthened beams showed indications of debonding or concrete-cover separation. DIC deformation concentrations generally corresponded to the observed crack locations. The comparison with Rohman et al. showed different trends due to differences in concrete strength, dimensions, reinforcement, and test configuration. The experimental-to-theoretical capacity ratio of 1.03-1.16 indicates that the theoretical calculations were more conservative.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	CFRP, HVFA, kapasitas lentur, beban-lendutan, pola retak, DIC CFRP, HVFA, flexural capacity, load-deflection, crack pattern, DIC
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA418.16 Materials--Testing. T Technology > TA Engineering (General). Civil engineering (General) > TA440 Concrete--Cracking. T Technology > TA Engineering (General). Civil engineering (General) > TA681 Concrete construction
Divisions:	Faculty of Vocational > 22301-Civil Infrastructure Engineering (D4)
Depositing User:	Bayu Anggoro Sekti
Date Deposited:	01 Aug 2026 03:15
Last Modified:	01 Aug 2026 03:15
URI:	http://repository.its.ac.id/id/eprint/141465

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