Mutiara, Inne Syabrina (2016) Pengaruh Suhu Perawatan Terhadap Penetrasi Ion Klorida Pada Beton Geopolimer. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pada bangunan lepas pantai air laut memiliki kandungan
garam yang tinggi yang dapat menggerogoti kekuatan dan
keawetan beton. Hal ini disebabkan klorida (Cl) yang terdapat
pada air laut yang merupakan garam yang bersifat agresif
terhadap bahan lain, termasuk beton. Reaksi antara beton dan dan
air laut yang agresif, terpenetrasi ke dalam beton dengan
senyawa-senyawa di dalam beton mengakibatkan beton
kehilangan sebagian kekuatan dan mempercepat proses
pelapukan.
Kadar fly ash yang tinggi pada beton mengakibatkan
penurunan tingkat penetrasi klorida. Berbagai metode perawatan
beton geopolimer yaitu dengan cara direndam dalam air,
dimasukan ke dalam uap (suhu 60ºC selama 24 jam), tanpa
perawatan, dan dimasukan ke dalam oven (suhu 250 ºC selama 24
jam) kuat tekan paling tinggi dicapai pada beton yang dirawat
dalam uap.
Bahan dasar beton geopolimer yang digunakan adalah
fly ash yang diaktifkan dengan natrium hidroksida (NaOH) 8 M
dan sodium silikat (Na2SiO3) . Perbandingan massa NaOH :
Na2SiO3 yaitu 1:1,5 ; 1:2 ; 1:2,5. Benda uji berupa silinder dengan
diameter 10 cm tinggi 20 cm. Sedangkan untuk pengukuran laju
korosi digunakan balok berukuran 10x10x15 cm yang diberi
tulangan polos diameter 16 mm. Benda uji dirawat pada suhu
ruangan dan disteam pada suhu 40ºC, 60ºC, 80ºC selama 24 jam .Kemudian direndam di air tawar sampai umur 28 hari, selajutnya
direndam dilarutan air garam. Pengujian beton geopolimer ini
meliputi uji kuat tekan, tes porositas dan penetrasi ion klorida
pada umur 28 hari, 60 hari (30 hari perendaman air garam), 90
hari (60 hari perendaman air garam), 120 hari (90 hari
perendaman air garam). Laju korosi diukur dengan Half Cell
Potential pada benda uji balok.
Dari penelitian ini didapatkan, suhu perawatan sangat
mempengaruhi beton geopolimer. Semakin tinggi suhu perawatan
dari suhu normal ke suhu 80ºC maka akan meningkatkan nilai
penetrasi ion klorida, tetapi kuat tekan ikut meningkat . Kuat
tekan paling tinggi berada pada variasi 2,5-80º yaitu sebesar
80,47 MPa pada umur 90 hari
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The offshore building in sea water has a high salt content
which can damage the strength and durability of concrete. It is
caused by chloride (Cl) contained in sea water. Salt in sea water
has an aggressive behavior for materials, especially on concrete.
The reaction between the concrete and sea water, which was
penetrated into the concrete with some compounds of it will lose
some strength and accelerate the weathering process of concrete.
High content of fly ash in concrete results the decreased
of chloride penetration level. There are some curing methods of
geopolymer concrete such as soak geopolymer concrete in water,
steam it in temperature 60°C for 24 hours, without treatment,and
put it into the oven (temperature of 250 ° C for 24 hr). The
highest compressive strength is obtained by steam curing.
Fly ash as based material for geopolymer concrete was
used in this study. Fly ash was mixed with sodium hydroxide
(NaOH) 8 M and sodium silicate (Na2SiO3) as the alkali. Mass
ratio of NaOH: Na2SiO3 was kept at 1: 1,5; 1: 2; 1: 2,5. The size
of cylindrical specimens were prepared with a diameter of 100
mm and 200 mm high. The measurement of corrosion rate is
using beam with each size of specimen was 10x10x15 cm. Steel
bar with a diameter of 16 mm was embedded for each beam
spesimens. The specimens were cured at room temperature and
steamed at 40ºC, 60ºC, 80ºC for 24 hours. After that, allspecimens were soaked in fresh water for 28 days. And then, the
immersion was continued in two conditions, which tap water and
salt water 3.5%. There are some testing of the sample, such as
compressive strength test, porosity test, chloride penetration test
at 0, 30, 60, and 90 days of immersion. The corrosion rate was
measured on beam specimens by using Half Cell Potential test.
From this study, temperature of curing was greatly
affected geopolymer concrete. The higher of curing temperature
(normal temperature to 80ºC) increased the chloride penetration
and the compressive strength. The highest compressive strength
was 80.47 MPa at 2,5-80ºC for 90 days.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSS 620.136 Mut p |
| Uncontrolled Keywords: | geopolimer, fly ash, suhu perawatan, steam cuirng, air garam, ion klorida |
| Subjects: | T Technology > TH Building construction > TH1461 Concrete construction. |
| Divisions: | Faculty of Civil Engineering and Planning > Civil Engineering > 22201-(S1) Undergraduate Thesis |
| Depositing User: | ansi aflacha |
| Date Deposited: | 18 May 2020 03:51 |
| Last Modified: | 18 Apr 2024 05:01 |
| URI: | http://repository.its.ac.id/id/eprint/76004 |
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