Bulu, Valerius Aryanto (2023) Pengaruh Kadar Serat Baja Galvanis terhadap Kuat Lentur Balok Beton Berserat. Undergraduate thesis, Fakultas Teknik Universitas Merdeka Malang.

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Abstract

The weakness of concrete is that it has low flexural strength. The addition of fiber in the concrete mix can increase the flexural strength of the beam. One of the fiber materials that can be used is galvanized steel fiber. This research needs to be carried out with a special study to determine the effect of galvanized steel fiber content on the flexural strength of fibrous concrete beams. This study used 15 test objects which were divided into 5 populations with the size of the test objects 15x15x70 cm. Variations in fiber content of 0%, 4%, 6%, 8%, 10% by weight of cement with a cement water factor of 0.48. The flexural strength test of concrete beams was carried out at 28 days old using a hydraulic concrete beam test kit with ASTM C78 standards concerning the Standard Test Method for Flexural Strength of Concrete (Using Simple Beam with Third Point Loading). This research resulted in an average flexural strength of normal concrete beams of 4.56 Mpa. While the highest average flexural strength using fiber is found at 10% fiber content of 6.13 Mpa or an increase of 34.42% from normal concrete. The lowest average flexural strength is found at 4% fiber content of 4.86 Mpa or an increase of 6.49% from normal concrete. So, the most sensitive steel fiber content in increasing flexural strength is 10% fiber content with a flexural strength value of 6.13 Mpa or an increase of 34.42% from normal concrete.

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