Studi Eksperimental Penggunaan Engineered Cementitious Composite Sebagai Alternatif Perkuatan Pada Struktur Balok Beton Bertulang Terkorosi.

Bastian, Marthinus Alexander (2020) Studi Eksperimental Penggunaan Engineered Cementitious Composite Sebagai Alternatif Perkuatan Pada Struktur Balok Beton Bertulang Terkorosi. Masters thesis, Intitut Teknologi Sepuluh Nopember.

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Abstract

Balok bertulang merupakan elemen struktur yang rentan terhadap korosi apabila terpapar pada lingkungan laut. Metode perbaikan secara keseluruhan dirasa terlalu mahal, sehingga perlu adanya metode perbaikan terhadap daerah sensitif yang berkurang akibat korosi. Engineered Cementitious Composite (ECC) merupakan material yang memiliki kuat tarik tinggi dengan regangan mencapai 5.1%, yang dicapai dengan membentuk retak mikro yang banyak dan rapat. Retak mikro yang banyak dan rapat dapat mengekang pelebaran retak sehingga dapat meminimalisir proses terjadinya korosi. Penelitian ini bertujuan untuk melihat ketahanan material balok ECC yang dibandingkan dengan balok Supplementary Concrete (SC) dan balok Normal Concrete (NC) saat diberikan percepatan korosi, dan diukur berdasarkan tingkat kehilagan massa tulangan baja akibat korosi. Hasil yang didapatkan balok ECC menunjukan tidak adanya spalling sehingga menghasilkan kehilangan massa baja tulangan paling kecil yakni pada tulangan transversal sebesar 3.83 % dan tulangan longitudinal sebesar 1.63 %. Balok NC dan SC mengalami tingkat kerusakan paling parah ditunjukan dengan retak horisontal sejajar tulangan longitudinal hingga spalling. Retakan horisontal dan spalling mengakibatkan kehilangan massa baja tulangan yang tinggi pada balok NC dan SC yakni pada tulangan transversal sebesar 7.50 % dan 6.12 %, sedangkang pada tulangan longitudinal sebesar 3.28 % dan 2.88 %. Selain itu penelitian ini ingin melihat perilaku lentur balok NC dan SC terkorosi yang di-repair dengan lapisan ECC. Perilaku lentur balok NC dan SC terkorosi dengan lapisan ECC diuji dengan melakukan pengujian lentur four point bending. Hasil pengujian menunjukan kinerja kuat tarik tinggi dari ECC dengan menciptakan retak mikro yang banyak dan rapat dapat memperbaiki performa lentur dan kapasitas beban mirip dengan balok NC dan SC tanpa korosi. Selain itu, hasil penelitian menunjukan faktor delaminasi antara sambungan beton lama dengan lapisan ECC tidak berpengaruh pada penurunan perilaku lentur balok. Hasil ini menunjukan daya lekat antara lapisan ECC dengan beton lama NC dan SC sangat baik. Kata kunci: ECC, korosi, repairing, perilaku lentur. ================================================================================================== Reinforced beams are structural elements that are susceptible to corrosion when exposed to the marine environment. The overall repair method is considered too expensive to be applicated unless repairing only conducted in a sensitive area reduced due to corrosion. Engineered Cementitious Composite (ECC) is an alternative material that implies a high tensile strength with a strain reach up to 5.1%, which is achieved by forming a large and tight micro cracking. These cracks can constrain the widening of the crack, as a result, to significantly minimize the process of corrosion. These research aims are to obtain the durability of the implementation of ECC material within the Supplementary Concrete (SC) and the Normal Concrete (NC) as designated parameter. A series reinforced concrete beams with three designated parameters are presented. The beams comprised of similar reinforcement where the ratio of compression, tension, and transverse bars were 1.0%, 1.5%, and 1.0% respectively, were given accelerated corrosion. To this end, the beams were tested under four-point bending and they were intended to fail in flexure mode. It is found that ECC beams showing largest ductility compared to other two with no spalling indication. The steel mass loss of transversal and longitudinal are 3.83% and 1.63% respectively. NC and SC beams demonstrate a discernible ductile plateau with the severe damage with spalling after occurring horizontal cracks parallel to the longitudinal reinforcement. The steel mass loss for NC and SC of transversal and longitudinal reinforcement in order are 7.50%, 6.12% and 3.28%, 2.88%. The test also aims to provide improvement in the strengthening of the corroded beam by using ECC. All corroded beams are repaired within ECC patch and loaded under the same scheme to evaluate their performance. These results indicate the adhesion between the ECC layer with the old NC and SC concrete can meet in a good agreement. It is also found that the flexural cracks manifested in each beam after strengthening by ECC are less critical under a damage tolerance of composite. Key Words: Engineered cementitious composite, corrosion, repairing, flexure behavior.

Item Type: Thesis (Masters)
Subjects: Q Science
Q Science > Q Science (General)
Divisions: Faculty of Civil, Environmental, and Geo Engineering > Civil Engineering > 22101-(S2) Master Theses
Depositing User: Marthinus Alexander Bastian
Date Deposited: 19 Aug 2020 06:53
Last Modified: 19 Aug 2020 06:53
URI: http://repository.its.ac.id/id/eprint/79167

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