Ramadhani, Dania Febry (2019) Sifat Mekanis Prototipe Mortar Geopolimer Dengan Pengaruh Karakteristik Agregat Halus. Diploma thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Agregat merupakan bahan utama penyusun beton geopolimer. Volume agregat yang digunakan umumnya berkisar antara 70% hingga 80% dari volume beton geopolimer. Karakteristik agregat seperti: gradasi, bentuk, dan tekstur sangat berpengaruh terhadap kekuatan beton geopolimer yang dihasilkan. Beton geopolimer yang memanfaatkan fly ash Tipe C sebagai bahan pengikat memiliki waktu setting yang sangat cepat dan sulit diprediksi. Berdasarkan permasalahan tersebut masih sedikit studi yang membahas mengenai pengaruh karakteristik agregat yang digunakan terhadap waktu setting beton geopolimer. Sehingga dalam tugas akhir ini membahas mengenai studi pengaruh karakteristik agregat halus terhadap waktu pengerasan mortar geopolimer yang menggunakan fly ash tipe C sebagai bahan pengikat. Tiga jenis agregat halus digunakan sebagai bahan campuran mortar geopolimer, diantaranya: pasir lumajang, pasir mojokerto dan pasir bojonegoro. Ketiga pasir yang dilakukan pengujian karakteristik yakni: analisa gradasi, berat jenis, kelembaban, kadar air, dan kadar lumpur. Perbandingan antara bahan pengikat terhadap bahan pengisi adalah 40:60 dan perbandingan fly ash terhadap alkali aktivator adalah 65:35. Alkali aktivator yang digunakan merupakan campuran antara NaOH dan Na2SiO3 dengan perbandingan 1:2.5. Tiga variasi molaritas NaOH yang digunakan yakni: 8 molar, 12 molar, dan 14 molar. Metode perawatan yang digunakan untuk mortar geopolimer adalah perawatan suhu ruangan (ambient curing) dan perawatan dengan oven (oven curing) pada suhu 100°C selama 24 jam. Ukuran benda uji mortar geopolimer yakni kubus 5 x 5 x 5 cm. Pengujian yang dilakukan untuk mortar geopolimer diantaranya: uji setting time, uji ultrasonic pulse velocity (UPV) pada umur 7, 28, dan 56 hari, dan kuat tekan pada umur 7, 28, dan 56 hari. Hasil uji setting time menunjukkan bahwa penambahan pasir mojokerto dan pasir lumajang memberikan pengaruh setting time mortar geopolimer yakni rata-rata 20 menit lebih cepat dari setting time pasta semen geopolimer. Sedangkan pasir bojonegoro memberikan pengaruh setting time mortar geopolimer yakni rata-rata 10 menit lebih lambat dari setting time pasta semen geopolimer. Mortar geopolimer dengan menggunakan pasir lumajang menghasilkan kuat tekan yang tinggi dari pada mortar geopolimer dengan menggunakan pasir mojokerto dan pasir bojonegoro. Nilai kuat tekan maksimum dari setiap variabel mortar geopolimer dengan pasir lumajang, pasir mojokerto dan pasir bojonegoro berturut-turut adalah: variabel PL-14M-(b) yakni 61.09 Mpa, variabel PM-14M-(b) yakni 26.34 Mpa dan variabel PB-14M-(a) yakni 4.32 Mpa
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Aggregate constitutes a major volume in geopolymer concrete. Generally, the aggregate volume is used between 70%-80% of the geopolymer concrete volume. Aggregate characteristics such as grading, shape, and texture greatly affect the strength of geopolymer concrete. Geopolymer concrete utilizing a type C fly ash as a binder has a fast setting time and difficult to predict. Based on these problems, a limit study that discusses the effect of aggregate characteristics used on the setting time of geopolymer concrete. So, in this final project discusses a study of the effect of fine aggregate characteristics on the hardening time geopolymer mortar using type C fly ash as a binder.
Three types of fine aggregates are used on a mixture of geopolymer mortar, namely, Lumajang sand, Mojokerto sand, and, Bojonegoro sand. These three characteristics of sand testing, namely, analysis of gradation, density, moisture content, water absorption and, mud content. The ratio of binder to filler material is 40:60 and for comparison of fly ash to alkaline activator is 65:35. The alkaline activator is a mix of NaOH solution with Na2SiO3 in ratio of 1:2.5. Three variations of NaOH molarity were used, namely: 8 molar, 12 molar, and 14 molars. Methods of treatment used for mortar geopolymer is a treatment with room temperature (ambient curing) and treatment with ovent (ovent curing) at 100°C for 24h. The size of the geopolymer mortar specimen is a cube 5 x 5 x 5 cm. Test performed on geopolymer mortar are setting time test, ultrasonic pulse velocity (UPV) at the age of 7, 28, and 56 days, and the compressive strength at the age of 7, 28, and 56 days. Setting time test results showed that the addition of Mojokerto sand and Lumajang sand influence setting time of geopolymer mortar, on average 20 minutes faster than setting time of geopolymer paste. While Bojonegoro sand influence setting time of geopolymer mortar, on average 10 minutes slower than setting time of geopolymer paste. Geopolymer mortar using Lumajang sand had a high compressive strength than geopolymer mortar using Mojokerto sand and Bojonegoro sand. The maximum compressive strength of geopolymer mortar with Lumajang sand, Mojokerto sand, and Bojonegoro sand: PL-14M-(b) is 61.09 MPa, PM-14M-(b) is 26.34 MPa, and PB-14M-(a) is 4.32 MPa. Lumajang sand gives the highest influence the compressive strength of geopolymer mortar.
| Item Type: | Thesis (Diploma) |
|---|---|
| Additional Information: | RSIS 620.136 Ram s-1 2019 |
| Uncontrolled Keywords: | geopolymer mortar, setting time, fine aggregate, type C fly ash. |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA418.38 Materials--Fatigue. T Technology > TA Engineering (General). Civil engineering (General) > TA440 Concrete--Cracking. T Technology > TA Engineering (General). Civil engineering (General) > TA441 Aggregates T Technology > TA Engineering (General). Civil engineering (General) > TA681 Concrete construction T Technology > TN Mining engineering. Metallurgy > TN295 Fly ash |
| Divisions: | Faculty of Vocational > Civil Infrastructure Engineering (D4) |
| Depositing User: | Dania Febry Ramadhani |
| Date Deposited: | 12 May 2023 05:02 |
| Last Modified: | 12 May 2023 05:02 |
| URI: | http://repository.its.ac.id/id/eprint/63844 |
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