This study discusses the resistance of concrete using OPC and PCC cement with a concrete quality plan of f'cr 15 MPa, f'cr 20 MPa and f'cr 28 MPa through a treatment process using normal water for 28 days which is then immersed in a peat water environment with pH ranged from 3.00 to 3.80 with an average pH of 3.44 for 120 days in Bengkalis Regency. The aim of this research is to examine the com…