Abstract: To help the future of the industry, the researchers developed a mix design of concrete with varying water-cement ratios from 0.50%, 0.55%, 0.60%, and 0.65% to be used as recycled concrete aggregates. These varying mix designs will determine the effects of the porosity of the RCA on a new concrete mix. Initially the compressive strength test results of the RCA display that as the Water-cement ratio increases the Compressive Strength decreases which can clearly see that Samples with 0.65% W/C ratio display an average compressive strength of 27.29 MPa which does not achieve the C30 standards. Using the Rapid Chloride Penetration Test the amount of electrical charge flows to the sample was computed, based on the results obtained from the rapid chloride penetration test, it can be concluded that the porosity of the recycled concrete aggregates has a significant impact on the new porosity of concrete when a mixture of both recycled aggregates and natural aggregates are used. The researchers found out that from a controlled sample which is a normal concrete, the value of its ion penetration gives an average of 3431.33 Coulombs. On the other hand, RCA 1 achieved an average of 5466 Coulombs, RCA 2 passed an average charge of 5681.33 Coulombs, and RCA 3 obtained an average charge of 6528.67 Coulombs, these indicate that the higher the water-cement ratio on the recycled aggregates used will contribute to the percentage of the void of the concrete that will give the ion a passageway to penetrate the concrete and obtain a higher value of charge.