UJI LENTUR BALOK BETON BERTULANG BENTANG 60 CM DENGAN BAHAN SPLIT PALU DAN PASIR MAHAKAM

Abstract

Final Faculty of Civil Engineering Department of the University of August 17, 1945
Samarinda.
Normal concrete is concrete beams that have a weight of 2200 - 2500 kg / m3 using
natural aggregates were broken or without broken.
Concrete Beams Using a mixture of concrete reinforcement steel reinforcement plus
series ,. The reinforcement in the concrete prevents cracks making the concrete more ductile than
ordinary concrete. The purpose of this study to determine the comparative value of the resulting
flexural strength of normal concrete beams and concrete beams using reinforcement using coarse
aggregate EX. Palu and fine aggregate from Samarinda Mahakam river.
This study using the test method (Indonesian National Standard) SNI 4431: 2011 were
performed in the laboratory using a maximum size of coarse aggregate is 30 mm. The sample used
for normal concrete beams and concrete beams using reinforcing each using 18 samples and the
total number of samples is 36 samples.
From the test results of concrete beam flexural strength of normal at 28 days average
value of flexural strength (f'cr) was 43.556 Kg / cm² or 4.356 MPa. Flexural strength testing using
iii
a reinforced concrete beam at 28 days the value of the average flexural strength (f'cr) is 92.000 kg
/ cm2 or 9.200 MPa.