Test results of the compressive strengths of cement mortars are
shown in Fig. 6
It was found that the compressive strengths of
cement mortars mixed with oil palm fiber and coconut coir fiber
tend to decrease with an increase in the fiber replacement ratios,
which is consistent with conclusion from other research .
Moreover, both types of mixed cement mortars had similar
compressive strengths: 424.5, 385.6 and 361.3 kg/cm2 for coconut
coir fiber, and 376.6, 351.4 and 288.5 kg/cm2 for oil palm fiber,
with fiber replacement ratios of 5%, 10% and 15% by weight, respectively.
The compressive strengths of both fiber cement mortars
were comparable due to the fact that the effects of the physical
properties of fibers were not significantly different.