The use of sustainable materials is greatly essential for green construction. Cement-based grout composition can be arranged by partially replacing cement content with the pozzolanic material such as fly ash, bottom ash, or others. The investigation of the utilization of fly ash replacement partially for cementitious materials of grout for pre-placed aggregate concrete was summarized in this study. This experimental study focused on investigating the appropriate grout composition in term of flow time using flow cone apparatus and compressive strength of the grout. A water-cement ratio, cement-sand ratio, fly-ash dosage in the mixture are the variable of the test. Mechanical properties of grout for pre-placed aggregate concrete, including compressive strength at 7, 14, 28, and 60 days were evaluated. The result indicated that increasing the dosage of pozzolanic material of the grout used in pre-placed aggregate concrete can lead the shorter efflux time and has a significant effect in term of hardened properties of the grout