As a eco-friendly material, Hwangtoh (red clay) has been studied for complete or partial replacement of portland cement consisted in concrete. In this research, the experimental works were conducted to study the initial quality control for the compressive strength of Hwangtoh concrete (24MPa) using the ultrasonic pulse velocity method and the impact echo method of nondestructive test methods.

• 홍성욱(정회원, 한밭대학교, 도시건축재생기술연구소 연구교수) | Hong, Seong-Uk
• 송근호(한밭대학교, 건축공학과 학사과정) | Song, Keun-Ho
• 윤익수(한밭대학교, 건축공학과 학사과정) | Yun, Ik-Su
• 김승훈(한밭대학교, 건축공학과 부교수) | Kim, Seung-Hun 교신저자