This research deals with carbon dioxide utilization using amino acid salt solution. Energy-efficient CCU (carbon capture and utilization) technology in which no thermal desorption step is required was suggested. Waste concrete was considerd as Ca²⁺ source. (1.5 M potassium glycinate + 0.15 M piperazine) was used. After solution is saturated with carbon dioxide, 25wt% 100 ml of calcium chloride solution to replace Ca²⁺ from waste concrete in experiment was added. And then, precipitated calcium carbonate (PCC) was formed. As a result of absorption experiments of (1.5 M potassium glycinate + 0.15 M piperazine), CO₂ loading value for the first absorption and reabsorption step was 0.7354 and 0.2848 mol CO₂/ mol absorbent, respectively. Also, the yield of PCC formation of (1.5 M potassium glycinate + 0.15 M piperazine) was 43.63%. Based on these data, the amount of CO₂ reduction was calculated. Calcium carbonate can be classified into calcite, vaterite, and aragonite according to their crystal structures and morphology. XRD and SEM analysis were performed and the result showed that the morphology of produced PCC salt was vaterite.