Pengaruh Rasio Tulangan Terhadap Daktilitas Beton Geopolymer

Putra, Jonathan Eka (2016) Pengaruh Rasio Tulangan Terhadap Daktilitas Beton Geopolymer. Undergraduate thesis, Institut Technology Sepuluh Nopember.

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Abstract

Beton Geopolimer ialah beton yang tidak mengandung semen, namun terbuat dari fly ash dan material yang mengandung oksida silika dan alumina. Kuat tekan dari geopolimer relatif lebih tinggi daripada beton konvensional (OPC). Salah satu kekurangan dari beton geopolimer ialah perilakunya yang getas sehingga kurang baik menjadi elemen struktur gempa. Penelitian bertujuan untuk mengetahui pengaruh rasio tulangan terhadap daktilitas balok beton geopolimer. Benda uji balok yang digunakan berukuran 15x15 cm2 dengan bentang 110 cm. Diameter tulangan tarik yang digunakan ialah 10 mm dan 12 mm dari baja tulangan polos. Rasio tulangan bervariasi 0,7% ; 1,05% dan 1,51%. Alkali activator menggunakan NaOH 8M dengan perbandingan massa NaOH dan Na2SiO3 ialah 1:2,5. Perawatan benda uji dilakukan pada suhu normal (29-34 ˚C) dengan kondisi lembab selama 28 hari. Pengujian lentur balok dilakukan pada umur 28 hari yang merupakan uji lentur murni dengan 2 titik pembebanan berjarak 30 cm. Retak awal pada semua benda uji terjadi pada daerah momen maksimum. Kapasitas lentur paling tinggi ditemukan pada balok 3D12(rasio tulangan 1,51%), daktilitas tertinggi dicapai oleh balok 2D10(rasio tulangan 0,7%) dengan indeks daktilitas 8.49. Daktilitas menurun seiring dengan meningkatnya rasio tulangan. =========================================================================================================== Geopolymer is a non-Portland cement concrete. It is produced from fly ash and materials which contains silicate oxide and alumina. Compression Strengh of geopolymer concrete is usually higher than OPC concrete. One of the weak point of geopolymer concrete is its brittle behavior, which makes geopolymer unsuitable to be implemented in earthquake resistant structure.The objective of this research is to study the effect of reinforcement ratio in the ductility of geopolymer concrete. Beams prepared with a section dimension of 15x15 cm2 and 110cm in length. Diameter of the plain reinforcement bar used are 10mm and 12mm. Reinforcement ratio are varied, 0.7% ; 1.05% and 1.51%. Alkali activator used in this study are NaOH 8M and Na2SiO3 with a mass ratio of 1:2.5. Moist curing are conducted in normal temperature (29-34 ˚C) for 28 days. Flexural testing was conducted at 28days old, with two point load which were separated by 30cm. First crack of all beams occurred in the area where the moment is maximum. Highest flexural capacity are found in 3D12 beam with rebar ratio of 1.51%. However, the highest ductility index of 8.49 was found in 2D10 beam having rebar ratio 0.7%. Ductility decreased when the rebar ratio was increased.

Item Type: Thesis (Undergraduate)
Additional Information: RSS 624.183 41 Put p-1
Uncontrolled Keywords: Balok Geopolimer, fly ash, alkali activator, sodium hidroksida, sodium silikat, daktilitas, rasio tulangan
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA683 Precast concrete construction. Prestressed concrete construction.
Divisions: Faculty of Civil Engineering and Planning > Civil Engineering > 22201-(S1) Undergraduate Thesis
Depositing User: Mr. Tondo Indra Nyata
Date Deposited: 31 Dec 2019 06:14
Last Modified: 01 Dec 2020 07:51
URI: https://repository.its.ac.id/id/eprint/72483

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