Recycled fibers produce paper with poor mechanical properties due to the irreversible lost of the swelling capacity with the level and duration of drying, i.e., hornification. The blending with virgin fiber is one of the methods to recover the interfiber bonding of the recycled pulp. The aim of this study was to evaluate the effect of blending African oil-palm frond-rachis soda pulp (RHPA) on the mechanical properties of Colombian commercial paperboard. At the laboratory standard handsheets were evaluated following the TAPPI standard methods at ratios of 15%, 25%, 35% and 50% of RHPA pulp. Strength properties of papers obtained were projected using relationship to estimate its behavior as corrugated board. The most important mechanical properties of paperboard RCT, CMT and CFC were increased since the lowest addition percentage of RHPA pulp (15%). SCT estimated by relationship showed increases of up to 54% for the evaluated paperboard in relation to the original material. RHPA pulp can be blended with commercial paperboard to improve its mechanical properties.