### RANCANGAN BETON NORMAL DAN BETON SERAT ROVING DENGAN PASIR TANAH MERAH SERTA BATU PECAH KUTAI BARAT

#### Abstract

Final Project Faculty of Civil Engineering Department of the University of August 17th

1945 Samarinda.

Normal concrete is concrete that has a weight of 2200 - 2500 kg/m³ using natural

aggregates were broken or without broken.

Fiber-reinforced concrete is a mixture of concrete plus fiber, generally in the form of

rods with a size of 5-500 μm with a length of about 25 mm. Fiber material may be asbestos fibers,

plastic fibers (polypropylene), or a piece of steel wire. The fibers in concrete prevents cracks that

makes concrete more ductile than ordinary concrete. The purpose of this study was to compare the

compressive strength value produced normal concrete and fiber-reinforced concrete that uses

coarse crushed aggregate of Kampung Keay Kutai Barat and fine aggregate from Tanah Merah

North Samarinda.

This study uses a mix design method (Indonesian National Standard) SNI 03-2847-2002

conducted in the laboratory using the maximum size of coarse aggregate is 40 mm. The sample

used for normal concrete or concrete fiber rovings variation of 0.25% and a variation of 0.5%

respectively using 30 samples and the total number of samples is 90 samples.

ii

From the test results normal concrete compressive strength at 28 days average

compressive strength value necessary (f'cr) is 108.050 Kg/cm² and compressive strength implied

(f'c) is 87.987 Kg/cm2 of the average compressive strength necessary that targeted (f'cr) = 255

kg/cm² and the compressive strength implied (f'c) = 175 kg/cm². Concrete compressive strength

testing of fiber rovings proportion of 0.25% at 28 days the value of the average compressive

strength of the targeted (f'cr) was 120.49 kg/cm² and the compressive strength implied (f'c) was

102.42 kg/cm² of the average compressive strength needs to be targeted (f'cr) = 255 kg/cm² and

the compressive strength implied (f'c) = 175 kg/cm². Concrete compressive strength testing of fiber

rovings proportion of 0.5% at 28 days the compressive strength average (f'cr) was 114.58 kg/cm²

and the compressive strength implied (f'c) is 93.68 kg/cm² of the average compressive strength

needs to be targeted (f'cr) = 255 kg/cm² and the compressive strength implied (f'c) = 175 kg/cm².

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VOL 1. NOMOR 1. AGUSTUS 2012