Concrete is one of the materials that must exist in the construction. From time to time the use of concrete to the contruction will crack. Therefore, it is necessary to repair and maintain the building contruction by providing reinforcement or adding certain materials to the building structure. One of the methods can be used in the concrete improvement is grouting method. This research studies about the effect of cement material on the concrete compressive strength at 7 , 14 and 28 days which have been improved and compared the cement water factor which used for cement grout injection. The results show that the average compressive strength before repaired is 32.01 MPa and after 7 , 14 and 28 days are 33.12 MPa, 21.85 MPa, and 24.99 MPa. The cement water factor mixture which can be used is 0.28 and 0.26 because both increase after 14 days with compressive strength after curing are 8.66 MPa and 8.81 MPa.