Concrete with a pore solution of pH 10-12 is less alkaline than sound concrete but would still produce a strong color hange with phenolphthalein indicator. It therefore follows that the indicator test is likely to underestimate the depth to which carbonation has occurred. The indicator has not changed color near the top and bottom surfaces, suggesting that these near-surface regions are carbonated to a depth of at least 3 mm from the top surface and 5 mm from the lower surface. Where the indicator has turned purple - the center of the slab - the pH of the concrete pore fluid remains high (above 8.6, probably nearer 10).. Based on the above technical background, this study was devoted to examine the depth analysis of carbonated concrete quantitatively.

• 윤인석(인덕대학교 건설정보공학과 교수) | Yoon In-Seok
• 최형규(인덕대학교 건설정보공학과 학부과정) | Choi Hyung-Kyu
• 정귀열(인덕대학교 건설정보공학과 학부과정) | Jung Gui-Yeol
• 손경일(인덕대학교 건설정보공학과 학부과정) | Son Kyung-ll
• 김영민(인덕대학교 건설정보공학과 학부과정) | Kim Young-Min