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Research Paper

Analysis of the Material Properties of Lightweight Air-Entrained Concrete using Seashell Aggregates

해양패각 잔골재를 활용한 경량 AE 콘크리트의 특성 분석

Ye-Rim Kim1
,
Bongsik Kim2
,
Yongsoo Ji3
,
Sang-Yeop Chung4*
김 예림1
,
김 봉식2
,
지 용수3
,
정 상엽4*
1Graduate Student, Department of Civil and Environmental Engineering, Yonsei University, Seoul, 03722, Korea
2Director of Research Institute, R&D Center, PENTAD Co., LTD, Seoul, 14576, Korea
3CEO, PENTAD Co., LTD, Seoul, 14576, Korea
4Associate Professor, Department of Civil and Environmental Engineering, Yonsei University, Seoul, 03722, Korea
1연세대학교 건설환경공학과 석사과정
2(주)펜타드 기술연구소 연구소장
3(주)펜타드 대표이사
4연세대학교 건설환경공학과 부교수
*Corresponding Author
31 December 2025. pp. 397-406
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Abstract

Concrete is the most widely consumed construction material in the world, and its main component—ordinary Portland cement (OPC)—accounts for about 8% of global CO2 emissions. Furthermore, the rising demand for concrete necessitates the extraction of larger amounts of sand and coarse aggregates, posing environmental concerns. Consequently, efforts to develop functional construction materials and utilize alternative aggregates have been intensified. As such, seashells have gained attention for their abundant calcium carbonate content. Furthermore, among many functional construction materials, foamed concrete has emerged as eco-friendly and energy-efficient material, characterized by superior insulation performance, low density, and frost-resistance owing to its numerous internal pores. In addition, its porous nature also enables effective noise reduction, highlighting its potential for soundproofing applications. Considering these advantages, this study investigates foamed concrete incorporating seashell aggregates as a sustainable solution to natural sand depletion and marine environmental pollution. A post-foaming method was employed, and an air-entraining (AE) agent was used as the foaming agent to entrain air in the concrete. Cockle and oyster shells were used as alternatives to conventional sand aggregates. Samples were produced by varying seashells replacement ratios and AE agent contents. Subsequently, their micro-structural characteristics were investigated and correlated with the corresponding mechanical properties. Furthermore, the sound absorption performance of foamed concrete incorporating seashells was evaluated using numerical approaches. The findings show that incorporating seashells can enhance the performance of foamed concrete without compromising its mechanical performance.

Keywords
foamed concrete
air-entraining agent
characterization
recycling seashell
noise-reduction analysis

콘크리트는 세계에서 가장 많이 사용되는 건설재료이며, 그 주요 구성요소인 보통 포틀랜드 시멘트(OPC)는 전 세계 CO2 배출량의 약 8%를 차지한다. 또한 콘크리트 수요 증가로 인해 막대한 양의 모래와 굵은 골재 생산이 요구되면서 환경 생태계 파괴 문제가 증가하고 있다. 이에 따라 기능성 건설재료 개발과 대체 골재 활용에 대한 연구가 활발히 진행되고 있으며, 특히 해양 패각은 풍부한 탄산칼슘 함량으로 주목받고 있다. 한편, 다수의 내부 기공을 가지는 기포콘크리트는 우수한 단열 성능, 낮은 밀도, 내동해성을 특징으로 하는 친환경･에너지 효율적 재료로 떠오르고 있다. 게다가, 기포콘크리트는 기공 특성으로 인한 소음 저감 성능이 우수하여 차음･흡음 건설재료로의 적용 가능성을 지닌다. 본 연구에서는 이러한 장점을 결합하여, 해양 패각을 혼입한 기포콘크리트를 대상으로 천연 잔골재 고갈 문제와 해양 환경오염 문제를 동시에 해결하고자 하였다. 연구 수행을 위해 post-foaming 공법을 적용하고, 공기연행제(AE제)를 발포제로 사용하여 공극을 형성하였으며, 꼬막 및 굴 패각을 모래 잔골재 대체재로 활용하였다. 다양한 패각 대체율과 AE제 함량 조건에서 제작된 시편에 대해 미세구조 특성을 분석하고, 기계적 성능과의 상관관계를 분석하였단. 또한 수치해석 기법을 통해 패각 혼입 기포콘크리트의 흡음 성능을 평가하였다. 본 연구는 해양 패각을 혼입한 기포콘크리트에서 기계적 성능을 저하시키지 않으면서 흡음 및 단열과 같은 기능적 성능 향상이 가능함을 확인하였다.

키워드
기포콘크리트
공기연행제
재료특성
해양패각 재활용
소음해석
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Information
  • Publisher :Computational Structural Engineering Institute of Korea
  • Publisher(Ko) :한국전산구조공학회
  • Journal Title :Journal of the Computational Structural Engineering Institute of Korea
  • Journal Title(Ko) :한국전산구조공학회 논문집
  • Volume : 38
  • No :6
  • Pages :397-406
  • Received Date : 2025-10-13
  • Revised Date : 2025-11-04
  • Accepted Date : 2025-11-04
  • DOI :https://doi.org/10.7734/COSEIK.2025.38.6.397
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