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.
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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:	http://repository.its.ac.id/id/eprint/72483

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