It has been many studies and technical developments of recycled aggregate for concrete, but some limits due to lacks of quality control and reliability. Thus, this study addresses to find real problems in using recycled aggregate for concrete through questionnaire. It is known that first of all, proper grades of commercially available recycled aggregate shall be necessary to produce proper and economical concrete.

• 김상철(한서대학교 토목공학과 교수) | Kim, Sang-Chel
• 조영근(한국건설생활환경시험연구원 첨단건설재료 센터 선임연구원) | Cho, Young-Keun