Pengaruh dispersan dan komposisi serat karbon terhadap sifat kekuatan tekan dan piezoresistivity komposit beton berpenguat serat karbon untuk aplikasi concrete self load monitoring

., Mashudi (2018) Pengaruh dispersan dan komposisi serat karbon terhadap sifat kekuatan tekan dan piezoresistivity komposit beton berpenguat serat karbon untuk aplikasi concrete self load monitoring. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Beton dengan penguat serat karbon adalah bahan yang berbasis sensor, dapat digunakan sebagai self-monitoring pada struktur beton berdasarkan piezoresistance-nya.. Kemampuan material untuk merespon beban tekan yang diterapkan dan dapat diukur melalui perubahan resistivitasnya. Proses dispersi serat karbon sangat mempengaruhi sifat mekanik dan elektrik komposit. Tiga jenis surfaktan Carboxymethyl selulosa, super plasticizer dan NaOH digunakan untuk membantu persebaran serat dengan variasi konsentrasi masing–masing 0, 0.4, 0.8, 1.2, dan 1.6 % berat terhadap 100 ml aquades dan diputar menggunakan magnetic stirrer dengan kecepatan putar 350 rpm. Suspense serat karbon dengan persebaran terbaik pada masing-masing dispersan ditambahkan pada campuran semen, agregat, dan air dengan variasi 0, 0.2, 0.4, 0.6, 0.8 % berat terhadap semen dan diaduk dengan mixing machine. Cetakan berbentuk tabung dengan ukuran 5 cm diameter dan 10 cm tinggi digunakan untuk membentuk sampel. Spektrofotometri UV-vis digunakan untuk karakterisasi dispersi serat karbon didalam suspense. Hasil UV-vis menunjukkan bahwa pada Carboxymethyl selulosa dan super plasticizer absorbansi meningkat saat konsentrasi antara 0, 0.4, dan pada maksimum point 0.8% peningkatan konsentrasi di atasnya akan berakibat pada penurunan nilai absorbansi. Di sisi lain, kenaikan konsentrasi NaOH dari 0, 0.4, 0.8, 1.2, 1.6 % berakibat pada kenaikan absorbansi dan menunjukkan dispesi serat yang sangat baik. Sifat piezoristivity diamati pada saat dilakukan pengujian kuat tekan dengan penambahan empat kumparan tembaga, dua kumparan luar sebagai sumber tegangan dan dua kumparan dalam sebagai piezoresistance detector. Hasil pengujian menunjukkan bahwa untuk semua variasi komposisi serat karbon nilai resistivitas awal menurun seiring penambahan komposisi serat. Dan nilai resistivitas juga menurun seiring bertambahnya beban tekan yang diberikan. Permukaan fraktur dan adhesi komposit diamati dengan pemindaian mikroskop elektron (SEM). Hasil pemindaian SEM menunjukkan bahwa adesi komposit sangat kuat. Gambar diambil tepat pada lokasi patahan tampak bahwa serat karbon membawa bagian beton yang masih tercengkeram kuat pada serat karbon. ============================================================================================== Carbon fiber reinforced concrete is a sensor base material, which can be used to realize the self -monitoring of concrete structures based on its piezoresistance. The Material’s ability can be sensing an applied compressive load through a measureable change in resistivity. Dispersion step of carbon fibers affected greatly the mechanical and electrical properties of the composites. Three type of surfactans, Carboxymethyl cellulose, super plasticizer and NaOH used to help fiber dispersion using different concentration 0.4, 0.8, 1.2 and 1.6 / aquades % wt. and dispersion helped by magnetic stirrer in 350 rpm. Suspense carbon fiber with the best distribution of each surfactant added to the mixture of cement, aggregate, and water with variations 0, 0.2, 0.4, 0.6, 0.8% by weight of cement and stirred with mixing machine. Tube molds of 5 cm in diameter and 10 cm in height were used to form the sample. UV-vis Spectrophotometry used for dispersion characterization of carbon fiber in suspense. The UV-vis results showed that in Carboxymethyl cellulose and super plasticizer absorbance increased at concentrations between 0, 0.4, and at a maximum point of 0.8% increase in concentration above it would result in a decrease in absorbance value. On the other hand, the increase in NaOH concentration from 0, 0.4, 0.8, 1.2, 1.6% resulted in increased absorbance and showed excellent fiber dispersion.The piezoristivity properties was observed at the time of compressive strength testing by the addition of four copper coils, two external coils as a voltage source and two inner coils as a piezoresistance detector. The test results show that for all variations of the carbon fiber composition the initial resistivity value decreased with the addition of the fiber composition. And the resistivity value was also decreases as the added pressure load was applied.The fracture surface and adhesion of the composites observed by scanning electron microscopy. The result of SEM scanning showed that composite adhesion was very strong. The picture was taken right at the fault site it appears that the carbon fiber carried concrete parts that were still gripped strongly on the carbon fiber.

Item Type: Thesis (Masters)
Uncontrolled Keywords: serat karbon, dispersi, self-monitoring, piezoresistance.
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA418.9 Composite materials. Laminated materials.
T Technology > TA Engineering (General). Civil engineering (General) > TA681 Concrete construction
Divisions: Faculty of Industrial Technology > Material & Metallurgical Engineering > 27101-(S2) Master Thesis
Depositing User: mashudi mashudi
Date Deposited: 21 Jul 2021 23:05
Last Modified: 21 Jul 2021 23:05
URI: https://repository.its.ac.id/id/eprint/56469

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