Pengaruh Serat Lokal Terhadap Kuat Tekan dan Kuat Lentur Reactive Powder Concrete dengan Teknik Perawatan Penguapan

Widodo Kushartomo, Daniel Christianto

Abstract


Abstrak. Penelitian yang dilakukan adalah mempelajari penggunaan serat baja produksi dalam negeri sebagai bahan campuran pada pembuatan Reactive Powder Concrete (RPC), guna mengurangi ketergantungan serat baja import yang biasa digunakan dalam pembuatan RPC. Volume serat baja yang digunakan dalam penelitian ini adalah 0,0%, 1,0%, 1,5 % dan 2,0%, sedangkan perbandingan antara panjang serat terhadap diameternya atau disebut sebgai aspek rasio (l/d) masing-masing adalah 50, 75 dan 100. Benda uji berupa silinder dengan diameter 75,0 mm, panjang 150,0 mm dan balok berukuran 100,0mm x 100,0mm x 350,0 mm. Dalam proses perawatan seluruh benda uji direndam dalam air selama 3 hari pada temperatur 20oC dilanjutkan dengan penguapan bertemperatur 90oC selama 8 jam. Pengujian dilakukan terhadap kuat tekan dan kuat lentur (modulus of rupture) setelah beton berumur 28 hari. Hasil pengujian menunjukkan, dengan diameter serat sebesar 0,3 mm berakibat pada penurunan nilai  kuat tekan RPC, sebaliknya terjadi peningkatan yang sangat besar terhadap kuat lentur RPC yaitu sebesar 300% - 400%. Kuat tekan dan kuat lentur optimum terjadi pada volume serat 1,5% dan aspek rasio l/d = 75 dengan nilai masing-masing adaalah 89,36 MPa dan 27,01 MPa.

Abstract. The research is studying the use of domestically produced steel fibers, as an ingredient in the manufacture of reactive powder concrete (RPC), in order to reduce dependence on imported steel fiber used in the manufacture of RPC. The volume of steel fibers used in this study was 0.0%, 1.0%, 1.5% and 2.0%, while the ratio between the length of the fiber to its diameter, or was designated aspect ratio (l / d) of each is 50, 75 and 100. Test specimen in the form of a cylinder with a diameter of 75.0 mm, 150.0 mm length, the beam size 100,0 mm 100,0 mm x 350.0 mm.  the curing process the specimen is immersed in water for 3 days at 20oC followed by steam curing at 90°C for 8 hours. The specimen was tested on the compressive strength and flexural strength (modulus of rupture) of concrete after 28 days old. The results of the research, 0.3 mm fiber diameter decreases the compressive strength of RPC, otherwise increasing the flexural strength of RPC in the amount of 300% - 400%. Optimum value of compressive strength and flexural strength in 1.5% of fibre volume and aspect ratio l / d = 75 with the value of 89.36 MPa and 27.01 MPa.

Keywords


Kuat tekan; Kuat lentur;Serat baja; Perawatan; Penguapan.

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References


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DOI: http://dx.doi.org/10.5614%2Fjts.2015.22.1.4

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