Concrete is a family of binding material, fine aggregate, coarse aggregate and water. Concrete is normally used in the frame structure. But there is some limitation like self-compaction, surface finishes, maintains strength at congested area. Due to this limitation making self-compacting concrete with the use of mineral admixture are considered in this research. SCC is a concrete that can be placed and compacted under its own weight without any vibration effort, assuring complete filling of formwork even when access is hindered by narrow gaps between reinforcement bars. The primary objective of this study is to make a design of experiment by Box Behnken design and response surface methodology, to add Aluminum Tri-hydrate (ATH) and understand its effects on fresh property. The result indicated that the described ATH% is - 4.550 +- 0.01763 Slump flow (mm). Additionally, 45.0% of the variation in ATH is explained by Slump Flow.