ABSTRACT:In order to study the basic behavior of natural banana stem fiber reinforced concrete, three type of tensile strength test namely split tensile strength, flexural strength and biaxial fatigue flexure strength were conducted. Comparison of these three type of tensile strength, their crack pattern and the way they fails were be analyzed and discussed. Results showed that the flexural strength value of the two type of biaxial tests are higher than the uniaxial test result( ASTM C-1550 have 47.046 % higher than ASTM C-78 and 37.871 % higher than ASTM C-496). The value of tensile strength as measured by ASTM C-1550-02 is slightly higher than the value of the flexural tensile strength as measured by the biaxial flexure test (21.062%). The lines of the crack pattern do not show clear macro fracture cracks before reaching the peak load. As observed, there are two peak load values found were the one occurred at the first cracked, after that the load stress curve decrease for a while and after a few seconds the load increase again to a value smaller than the first peak load value.This is because at the time of the first cracking in three axes symmetry, the load that can be maintained by the concrete specimen had reached its maximum but after that the load increase again because the stress has been transferred to the fiber, so the stress rises again until the fiber break off. This indicates that the fiber plays an important role in holding and redistributed the tensile load.

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