Nastiti, Syahidah Fani (2020) Pengaruh Tebal Lapisan Geopolimer pada Beton Normal terhadap Laju Korosi Baja Tulangan. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Durability beton di lingkungan air laut sangat diperhatikan karena konsentrasi senyawa kimia yang terkandung dapat merusak struktur beton, terutama di area tidal zone. Diperlukan material pelapis yang tahan terhadap serangan senyawa kimia, sehingga struktur beton dapat terlindungi. Geopolimer merupakan inovasi penggunaan material baru seperti fly ash sebagai pengganti semen. Dari penelitian-penelitian yang telah dilakukan, ketahanan geopolimer lebih baik dalam melindungi beton bertulang di lingkungan yang agresif. Dalam penelitian ini geopolimer berbahan dasar fly ash berfungsi sebagai pelapis beton normal di lingkungan air laut. Digunakan perbandingan fly ash dan alkali aktivator 65:35. Alkali aktivator berasal dari campuran Na2SiO3 dan NaOH 12M dengan perbandingan 2,5:1. Benda uji dengan variasi tebal 2,5 cm, 4 cm, dan 6 cm, sehingga ukuran benda uji lolipop kubus adalah 15x15x15 cm, 18x18x18 cm, dan 22x22x22 cm. Benda uji lolipop kubus digunakan untuk pengukuran laju korosi tulangan baja dengan teknik percepatan korosi yaitu Accelerated Corrosion Test. Benda uji silinder digunakan untuk uji penetrasi ion klorida, kuat tekan, modulus elastisitas, kuat tarik belah, porositas, dan pH dengan ukuran 10x20 cm. Curing benda uji dilakukan di air laut (seawater) dan sebagai kontrol dengan moist curing. Berdasarkan hasil penelitian dapat disimpulkan bahwa kuat tekan beton OPC terlapisi mortar dengan ketebalan 4 cm mencapai kuat tekan tertinggi setelah direndam selama 90 hari di lingkungan air laut. Kandungan klorida bebas yang ada pada beton OPC terlapisi mortar geopolimer memiliki kapasitas pengikatan klorida lebih baik dibanding material lain. Laju korosi beton OPC yang terlapisi mortar geopolimer 4 cm lebih rendah dibandingkan dengan ketebalan lapisan lainnya. Rekomendasi untuk ketebalan lapisan optimal mortar geopolimer pada beton bertulang di lingkungan air laut yang cocok diterapkan adalah 4 cm.
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Durability of concrete in seawater environment is very important because aggresive ions from of seawater to the concrete structure, especially in the tidal zone area. Coating material is required to protect the structure from chemical attacks. This study presents the utilization of geopolymer as a non-portland material. Previous studies found that geopolymer had good resistance from aggresive environments. In this study, geopolymer was used as a layer on marine structure. Geopolymer was created from fly ash and alkali activator with a ratio of 65:35. Alkali activator was a mixture of Na2SiO3 and NaOH 12M with a ratio of 2.5:1. The 10x10x10 cm Lollipop cube was covered by geopolymer mortar with thickness variation of 2,5 cm, 4 cm, and 6 cm. These shapes were used in Accelerated Corrosion Test to measure the corrosion rate on steel reinforcement. The 10x20 cm Cylindrical specimens were used for mechanical and chemical test. Specimens were cured by using moist method as a control and sinking in seawater. This study showed that the compressive strength of concrete coated with 4 cm thickness of geopolymer mortar reaches the highest compressive strength after being placed for 90 days in the seawater. The free chloride binding capacity in coated concretes with geopolymer mortars has good performance than the other material. Corrosion rate on the lollipop cube covered with 4 cm thickness of geopolymer mortar has the lowest rate. It is recommended to use 4 cm thick of geopolymer layer on marine structure.
| Item Type: | Thesis (Masters) |
|---|---|
| Additional Information: | RTS 620.136 Nas p-1 |
| Uncontrolled Keywords: | fly ash, penetrasi ion klorida, laju korosi, air laut, geopolimer |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA418.74 Corrosion and anti-corrosives T Technology > TA Engineering (General). Civil engineering (General) > TA418.75 Corrosion-resistant materials T Technology > TA Engineering (General). Civil engineering (General) > TA418.9.C57 Coatings T Technology > TA Engineering (General). Civil engineering (General) > TA418.9 Composite materials. Laminated materials. T Technology > TD Environmental technology. Sanitary engineering > TD427.F58 Fly ash |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22101-(S2) Master Thesis |
| Depositing User: | SYAHIDAH FANI NASTITI |
| Date Deposited: | 10 Mar 2025 01:45 |
| Last Modified: | 10 Mar 2025 01:45 |
| URI: | http://repository.its.ac.id/id/eprint/74156 |
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