Influence of the Shaping Process on the Tensile Properties of Steel Reinforcement Bars Carbon Steel Grades BJTP24 and BJTS40

Authors

Nuraziz Handika, Department of Civil Engineering, Faculty of Engineering, Universitas Indonesia, Depok 16424, IndonesiaFollow
Ridha Amalia Idhar, Department of Civil Engineering, Faculty of Engineering, Universitas Indonesia, Depok 16424, Indonesia
Jessica Sjah, Department of Civil Engineering, Faculty of Engineering, Universitas Indonesia, Depok 16424, Indonesia
Essy Arijoeni, Department of Civil Engineering, Faculty of Engineering, Universitas Indonesia, Depok 16424, Indonesia
Elly Tjahjono, Department of Civil Engineering, Faculty of Engineering, Universitas Indonesia, Depok 16424, Indonesia

Abstract

According to the current applicable national standard in Indonesia, i.e. SNI 07 2529 1991, in addition to the limitation on the loading rate, the steel bar must be reduced, formed, or lathed, as part of the shaping process of samples. This study determined and compared the effect of the shaping process on the yield strength, ultimate strength, and percent elongation by conducting tensile tests of steel bar grade BJTS40, i.e. deformed bar type of steel, and grade BJTP24, i.e., plain bar type of steel. Three diameters of the deformed bar (BJTS40) and one diameter of the plain bar (BJTP24) were used. Samples of the bars were taken randomly from a local distributor in the Greater Jakarta area. Each 1 m of the bar is divided into two, i.e. one end being the non-shaped sample and the other end being the shaped sample. Tensile tests of these two sides were conducted. This study determined that the shaping process influences the results of the tensile test, particularly the variation of percent elongation. Moreover, the effects of the shaping process can be inferred from the high coefficients of variation of yield strength (4.33%) and ultimate strength (2.40%) of the shaped sample. The results of this study, which elucidate the effects of the shaping process on tensile tests, can be used as an information resource in engineering practice.

Bahasa Abstract

Pengaruh Proses Pembentukan pada Sifat Tarik Besi Beton Kualitas Baja Karbon BJTP24 dan BJTS40. Menurut standar nasional yang berlaku di Indonesia, SNI 07 2529 1991, selain adanya batasan kecepatan pembebanan, sampel batang baja harus dikurangi, dibentuk, atau dibubut, sebagai bagian dari proses persiapan sampel. Penelitian ini membandingkan efek pembentukan proses pada uji tarik dari baja batangan mutu BJTS40 untuk baja tulangan sirip dan baja batangan mutu BJTP24 untuk baja tulangan polos terhadap tiga parameter utama baja yaitu: kekuatan leleh, kekuatan ultimit dan % perpanjangan. Tiga diameter baja tulangan sirip BJTS40 dan satu diameter baja tulangan polos BJTP24 digunakan. Sampel batang dipilih secara acak dari distributor local di wilayah Jakarta. Setiap satu metre batang dibagi menjadi dua, satu ujung tidak dibubut dan yang lainnya sampel yang dibubut. Hasil uji tarik dari sampel kedua sisi ini diamati. Berdasarkan studi ini, proses pembubutan mempengaruhi hasil uji tarik, khususnya pada koefisien variasi dari % perpanjangan. Selain itu, efek dari proses pembubutan juga dapat dilihat pada koefisien variasi yang lebih besar untuk tegangan leleh (4,33%) dan tegangan ultimit (2,40%) untuk sampel yang dibubut. Hasil penelitian ini bermanfaat sebagai sumber informasi dalam penggunaan praktis keteknikan dengan memberikan efek dari proses pembubutan pada sampel baja untuk tes tarik.

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Recommended Citation

Handika, Nuraziz; Idhar, Ridha Amalia; Sjah, Jessica; Arijoeni, Essy; and Tjahjono, Elly (2020) "Influence of the Shaping Process on the Tensile Properties of Steel Reinforcement Bars Carbon Steel Grades BJTP24 and BJTS40," Makara Journal of Technology: Vol. 24: Iss. 3, Article 7.
DOI: 10.7454/mst.v24i3.3914
Available at: https://scholarhub.ui.ac.id/mjt/vol24/iss3/7