Surya, Krisnanda Putra (2024) Pengaruh Variasi Gradasi Agregat Terhadap Kuat Tekan Ultra-High Performance Concrete (UHPC). Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Ultra-High Performance Concrete (UHPC) adalah beton yang memiliki karakteristik flowability tinggi, kuat tekan yang tinggi. Salah satu kunci UHPC adalah packing density yang tinggi. Hal yang mempengaruhi packing density adalah distribusi ukuran agregat. Pada penelitian sebelumnya terdapat penggunaan agregat kasar sebagai bahan pengisi pada UHPC. Namun, pada penelitian tersebut tetap menggunakan bahan utama UHPC seperti pasir kuarsa dan silica fume. Oleh karena itu, pada penelitian ini dilakukan eksperimen UHPC menggunakan agregat kasar dan pasir lumajang sebagai agregat halus, serta penggunaan fly ash. Penelitian ini mengacu pada ASTM C1856-17. Penelitian ini bertujuan untuk mengetahui pengaruh gradasi agregat terhadap flowability (ASTM C1437-07) dan kuat tekan (ASTM C1856-17) UHPC menggunakan metode packing density. Pengujian Agregat kasar yang digunakan adalah kerikil dengan ukuran maksimal 9,5 mm dan agregat halus adalah pasir lumajang. Terdapat 9 variasi UHPC dengan rasio volume agregat yang berbeda. Sampel uji yang digunakan adalah silinder berukuran 70x150 mm. Pengujian kuat tekan dilakukan pada umur 7 dan 28 hari dengan masing-masing menggunakan 3 sampel uji pada tiap variasi. Hasil nilai packing density menunjukkan penurunan seiring meningkatnya rasio agregat kasar. Pengujian flowability menghasilkan nilai berkisar antara 120-220 mm. Hasil pengujian kuat tekan pada umur 7 hari menghasilkan nilai kuat tekan sebesar 30-62 MPa. Sedangkan hasil pengujian kuat tekan pada umur 28 hari tertinggi sebesar 73,79 MPa pada rasio Ca/S=0,25 dan terendah 32,29 pada rasio Ca/S=0,75. Sehingga dapat diketahui hubungan yang sejalan antara packing density dengan kuat tekan. Hasil penelitian menunjukkan nilai optimum penggunaan agregat kasar yaitu rasio Ca/S=0,50 dengan Vb/Va=1,0. Namun, hasil pengujian kuat tekan pada umur 28 hari belum mencapai nilai standar ASTM C1856-17 yaitu sebesar >120 MPa. Hal ini disebabkan oleh penggunaan agregat kasar yang menyebabkan kepadatan berkurang sehingga dapat mengurangi kuat tekan. Oleh karena itu, bahan utama UHPC perlu digunakan untuk meningkatkan packing density yang kemudian dapat meningkatkan kuat tekan.
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Ultra-High Performance Concrete (UHPC) is concrete characterized by high flowability and high compressive strength. One of the keys to UHPC is high packing density. The thing that affects the packing density is the aggregate size distribution. In previous research, there was the use of coarse aggregate as filler material in UHPC. However, the study still used the main components of UHPC such as silica sand and silica fume. Therefore, in this study, UHPC experiments were conducted using coarse aggregate and lumajang sand as fine aggregate, as well as the use of fly ash. This research is based on ASTM C1856-17. This study determines the effect of aggregate gradation on flowability (ASTM C1437-07) and compressive strength (ASTM C1856-17) of UHPC using packing density method. The coarse aggregate used is gravel with a maximum size of 9.5 mm and the fine aggregate is lumajang sand. There are 9 variations of UHPC with different aggregate volume ratios. The test specimens used were 70x150 mm cylinders. Compressive strength tests were conducted at 7 and 28 days using 3 specimens for each grade. Packing density values showed a decrease as the coarse aggregate ratio increased. The flowability test gave values in the range of 120-220 mm. Compressive strength test results at the age of 7 days gave a compressive strength value of 30-62 MPa. While the highest compressive strength test result at the age of 28 days was 73.79 MPa at a Ca/S ratio of 0.25 and the lowest was 32.29 at a Ca/S ratio of 0.75. Thus, it can be seen that the relationship between packing density and compressive strength is in line. The results showed that the optimum value of coarse aggregate utilization is Ca/S ratio=0.50 with Vb/Va=1.0. However, the compressive strength test results at the age of 28 days did not reach the ASTM C1856-17 standard value of >120 MPa. This is due to the use of coarse aggregate, which causes the density to decrease, thus reducing the compressive strength. Therefore, the main component of UHPC must be used to increase the packing density, which can then increase the compressive strength.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Ultra-High Performance Concrete, Gradasi Agregat, Agregat Halus, Agregat Kasar, Packing Density, Kuat Tekan, Aggregate Gradation, Fine Aggregate, Coarse Aggregate, Compressive Strength |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TA Engineering (General). Civil engineering (General) > TA418.16 Materials--Testing. T Technology > TA Engineering (General). Civil engineering (General) > TA418.42 Hardness properties and tests. Hardness--Testing. T Technology > TA Engineering (General). Civil engineering (General) > TA433 Strength of materials. T Technology > TA Engineering (General). Civil engineering (General) > TA441 Aggregates |
| Divisions: | Faculty of Vocational > Civil Infrastructure Engineering (D4) |
| Depositing User: | Krisnanda Putra Surya |
| Date Deposited: | 22 Aug 2024 07:55 |
| Last Modified: | 22 Aug 2024 07:55 |
| URI: | http://repository.its.ac.id/id/eprint/112434 |
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