Evaluasi Mutu Beton Geopolimer Berbasis High-Calcium Fly Ash Dengan Molaritas Naoh 12 Menggunakan Metode Pencampuran Kering

Firmansyah, Akmal (2023) Evaluasi Mutu Beton Geopolimer Berbasis High-Calcium Fly Ash Dengan Molaritas Naoh 12 Menggunakan Metode Pencampuran Kering. Diploma thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Beton geopolimer merupakan inovasi beton tanpa menggunakan semen OPC pada campurannya, karena pada komposisi campurannya menggunakan limbah yang mengandung silika dan alumina, yaitu fly ash. Pada penelitian sebelumnya sudah banyak penelitian beton geopolimer dengan berbagai variasi molaritas. Tetapi pada penelitian sebelumnya benda uji yang dibuat berjumlah sedikit, sehingga mutu beton geopolimer yang dihasilkan bukan merupakan mutu karakterisitiknya. Oleh karena itu, pada penelitian ini dilakukan evaluasi mutu beton geopolimer 12 molar dengan membuat sampel sebanyak 60 silinder 10x20 cm. Dengan jumlah sampel tersebut maka peneliti mampu mengetahui kuat tekan karakteristik untuk beton geopolimer dengan molaritas 12. Penelitian ini bertujuan untuk mengetahui mutu karakteristik dan peforma uji UPV, permeabilitas, hammer, resistivitas, dan kuat tekan beton geopolimer 12 molar. Alkali aktivator yang digunakan adalah natrium hidroksida (NaOH) dengan molaritas 12 dan natrium silikat (Na2SiO3) dengan perbandingan 1:1, menggunakan fly ash tipe C, admixture sika visconcrete 3115 N sebesar 5% dari kebutuhan fly ash. Sampel yang digunakan adalah silinder berukuran 10x20 cm sebanyak 60 buah dan 5 benda uji berukuran 15x30 cm. Setelah itu dilakukan curing suhu ruang hingga sampel berumur 28 hari, kemudian dilakukan pengujian UPV, permeabilitas, hammer, resistivitas, dan diakhiri dengan pengujian kuat tekan. Hasil dari pengujian tersebut dianalisa untuk mendapatkan mutu karakteristik beton geopolimer 12 molar. Pengujian beton geopolimer 12 molar dengan umur 28 hari menghasilkan mutu karakteristik sebesar 14.468 MPa, standar deviasi total 10.171 MPa, standar deviasi within batch 8.11 MPa, standar deviasi batch to batch 13 MPa, dan koefisien variasi 28.9 %.. Hasil uji workability beton geopolimer menghasilkan nilai slump 230 mm. Sedangkan uji non destruktive UPV mendapatkan rata-rata 3871 m/s2 termasuk klasifikasi baik, uji resisitivitas rata-rata 7.327 kΩcm menandakan beton memiliki tingkat korosi yang tinggi, uji permeabilitas rata-rata 1.134 E-16 m2 termasuk klasifikasi buruk. Serta korelasi uji hammer dengan kuat tekan mendapatkan nilai koefisien korelasi 0.48 yang menunjukkan korelasi yang sedang, sedangkan korelasi UPV dengan kuat mendapatkan nilai koefisien korelasi 0.74 yang menunjukkan korelasi yang dekat.
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Geopolymer concrete is a concrete innovation without using OPC cement in the mixture, because the composition of the mixture uses waste containing silica and alumina, namely fly ash. In previous studies, there have been many studies of geopolymer concrete with various molarity variations. However, in previous studies the number of test objects made was small, so the quality of the geopolymer concrete produced was not its characteristic quality. Therefore, in this study, the quality of 12 molar geopolymer concrete was evaluated by taking 30 pairs or 60 samples with a molarity of 12. With this number of samples, the researchers were able to determine the characteristic compressive strength for geopolymer concrete with a molarity of 12. This study aims to determine the quality characteristics and performance of the UPV test, permeability, hammer, resistivity, and compressive strength of 12 molar geopolymer concrete. The alkaline activator used is sodium hydroxide (NaOH) with a molarity of 12 and sodium silicate (Na2SiO3) with a ratio of 1:1, using type C fly ash, 3115 N sika visconcrete admixture of 5% of the fly ash requirement. The samples used were 60 cylinders measuring 10x20 cm and 5 specimens measuring 15x30 cm. After that, room temperature curing was carried out until the sample was 28 days old, then tested for UPV, permeability, hammer, resistivity, and ended with a compressive strength test. The results of the test were analyzed to obtain the characteristic quality of 12 molar geopolymer concrete. Testing of 12 molar geopolymer concrete with 28 days of age yielded a characteristic quality of 14,468 MPa, a standard deviation of 10,171 MPa in total, a standard deviation within batch of 8.11 MPa, a standard deviation of batch to batch of 13 MPa, and a coefficient of variation of 28.9%. The workability test results of geopolymer concrete yielded slump value of 230 mm. While the non-destructive UPV test obtained an average of 3871 m/s2 including a good classification, an average resistivity test of 7.327 kΩcm indicating that concrete has a high level of corrosion, an average permeability test of 1.134 E-16 m2 is classified as bad. And the correlation of the hammer test with compressive strength gets a correlation coefficient of 0.48 which indicates a moderate correlation, while the UPV correlation with a strong gets a correlation coefficient of 0.74 which indicates a close correlation.

Item Type:	Thesis (Diploma)
Uncontrolled Keywords:	beton geopolimer, evaluasi mutu beton, pencampuran metode kering, fly ash tipe C, geopolymer concrete, concrete quality evaluation, dry mixing method, type C fly ash
Subjects:	T Technology > TH Building construction > TH1461 Concrete construction.
Divisions:	Faculty of Vocational > Civil Infrastructure Engineering (D4)
Depositing User:	Akmal Firmansyah
Date Deposited:	08 Aug 2023 08:40
Last Modified:	08 Aug 2023 08:40
URI:	http://repository.its.ac.id/id/eprint/103351

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