Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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A Hydration Reaction and Strength Development Properties of Cement Using Pond Ash in Coal Fired Power Plant

화력 발전소 매립회를 치환한 시멘트의 수화반응 및 강도발현 특성

  • Lee, Jae-Seung (Construction Materials Center, Korea Conformity Laboratories) ;
  • Noh, Sang-Kyun (Construction Materials Center, Korea Conformity Laboratories) ;
  • Shin, Hong-Chul (Construction Materials Center, Korea Conformity Laboratories)
  • 이재승 (한국건설생활환경시험연구원 건설재료센터) ;
  • 노상균 (한국건설생활환경시험연구원 건설재료센터) ;
  • 신홍철 (한국건설생활환경시험연구원 건설재료센터)
  • Received : 2021.11.02
  • Accepted : 2021.12.10
  • Published : 2021.12.30
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Abstract

This study comparatively analyzed the properties of hydration reaction and strength development of four types of pond ash(PA) and fly ash(FA), aiming for the effective use of PA. The PA whose chlorine content was highest due to the seawater movement method had a faster setting time, higher cumulative heat, and greater initial strength development than those of FA due to the acceleration of the cement hydration reaction. However, the activity factor increase rate decreased after seven days of curing due to the rapid generation of early hydrates. The PA that contained impurities, such as a large amount of unburned carbon, had a delayed setting time due to the lower hydration reaction. Moreover, the strength was degraded in all curing ages. The PA whose chlorine content was lower due to the freshwater movement method and the amorphous content exhibited similar hydration reactivity and strength development characteristics compared to that of FA. The thermogravimetric analysis results verified that it had a similar level of Ca(OH)2 consumption and pozzolanic reactivity with that of FA. Conclusively, it is necessary to expand the application of the freshwater movement method and manage the ignition loss to raise PA's usability.

본 연구에서는 매립회의 유효 활용을 위해 플라이애시(FA)와 매립회(PA) 4종의 수화반응 및 강도발현 특성을 비교 분석하였다. 해수 이동방식에 의해 염소함량 높은 PA는 시멘트 수화반응 촉진으로 FA와 비교하여 응결시간이 촉진되고, 누적 발열량이 증가하였으며, 초기 강도발현이 향상되었다. 그러나 재령 7일 이후 초기 수화물의 급격한 생성으로 활성도 지수 증가율은 감소하였다. 다량의 미연탄소 등 불순물을 함유한 PA는 낮은 수화 반응성으로 응결시간이 지연되고, 전 재령에서 강도가 저하되었다. 담수 이동방식에 의해 염소함량 낮고, 비정질량이 높은 PA는 FA와 유사한 수화반응 및 강도발현 특성을 나타냈다. 열중량 분석결과로 FA와 비슷한 수준의 Ca(OH)2 소비량과 포졸란 반응성을 가진 것을 확인하였다. 결과적으로 매립회의 활용성 높이기 위해서는 담수 이동방식의 적용 확대와 강열감량의 관리가 필요할 것으로 분석되었다.

Keywords

Acknowledgement

이 연구는 2021년도 산업통상자원부 및 산업기술평가관리원(KEIT) 소재부품기술개발사업의 연구비 지원에 의한 연구임(20010607)

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