The reinforced concrete is the first material to use on many construction. But the casting process of concrete on project that also was stopped in the street. Giving rise to a connection between the old concrete with new concrete. The purpose of this research was for analysis flexural strenght on the connection of concrete with concrete glue (adhitive substance) compared with the connection beam not using concrete glue (adhesive substance) and than two variations to compared with normal beam concrete no joint. This research using beam with demantion 600 mm x 150 mm x 150 mm with reinforce 4D8 and 4D6. The result of method flexural strength using with a load that is placed one point or amid centered. The sample will be test after 28 days. Result of this research get value concrete flexural strength of connection no SikaCim Bonding Adhesive of 5,47 MPa, 5,25 MPa, 5,60 MPa with average of 5,44 MPa. The flexural strength of connection with SikaCim Bonding Adhesive of 6,70 MPa, 6,39 MPa, 7,29 MPa with everage of 6,79 MPa, and than for normaly beam of 7,74 MPa, 7,30 MPa, 7,66 MPa, with average of 7,57 Mpa.