We conducted this study to develope technique for removing fine mortar attached to waste reinforcing steel bar (D13). We observed the effect of the glycolic acid concentration (10 ~ 40%) and reaction time (0.5 ~ 4 hr) on the mortar removal. The reaction rate (−1.3089 hr−1) was the fastest at 20% of glycolic acid. The mortar was completely removed in 3 hrs. The reaction rate decreased with pH increase (1.4 ~ 2.0) at 20% of glycolic acid.

• 길준호(강원대학교 환경공학과) | Jun-Ho Gil
• 김정훈(강원대학교 환경공학과) | Jung-Hun Kim
• 안종화(강원대학교 환경공학과) | Johng-Hwa Ahn Corresponding author