Selection of Optimum Ternary Binder Systems that Enhance the Workability and Durability of Concrete used in Marine Railways

Byun, TaeYoon; Cho, KookHwan

doi:2024.24.2.77

J. Korean Soc. Hazard Mitig. > Volume 24(2); 2024 > Article

Article

시설물방재

Journal of the Korean Society of Hazard Mitigation 2024;24(2):77-83.
DOI: https://doi.org/10.9798/KOSHAM.2024.24.2.77 Published online April 24, 2024.

철도 해양 콘크리트의 시공성 및 내구성 확보를 위한 최적의 3성분계 결합재 선정을 위한 실험적 연구

변태윤¹, 조국환²

^¹정회원, 서울과학기술대학교 철도전문대학원 박사과정
^²정회원, 서울과학기술대학교 철도전문대학원 교수

Selection of Optimum Ternary Binder Systems that Enhance the Workability and Durability of Concrete used in Marine Railways

TaeYoon Byun¹, KookHwan Cho²

¹Member, Ph.D. Graduate, Graduate School Of Railway, Seoul National University of Science&Technology
²Member, Professor, Graduate School Of Railway, Seoul National University of Science&Technology

Corresponding author: KookHwan Cho, Tel: +82-2-970-6584, Fax: +82-2-970-5866,
Email: khcho@seoultech.ac.kr

Received: 15 January 2024 • Revised: 16 January 2024 • Accepted: 20 March 2024

Abstract

In this study, the improvement of the compressive strength and duradbility of concrete used in marine railways by adding binding agents was investigated. The test speciments used in the study comprised developed product A (DP_A), developed product B (DP_B), Ordinary Portland Cement (OPC), admixture A, and admixture B, in the study, the optimum ternary binder systems of the test specimens were identified. An optimum ternary binder system would facilitate the simultaneous enhancement of the durability and workability of concrete used on undersea tunnel linings and bridge structures. The compressive strength of each specimen tested after 16h could easily meet the specified standard target strength (> 3.0_MPa). Moreover, the 7d long term strength of each test specimen exceeded 3.0 MPa. When binders were used, the chloride penetration resistance (DP_A was exceptional)_2.741C (normal) and, 1.490C (low) following-28 and 91days. The surface diffustion coefficient of (DP_B) at 91days 9.12 (× 10-12, m²/sec) was higher than that of OPC 9.55 (× 10-12, m²/sec). However, the surface diffusion coefficient of (DP_A) was 4.15 (× 10-12, m²/sec) which was lower than OPC by approximately 57%, indicating the outstanding durability of DP_A.

Key Words: Binder, Durability, Ternary System, Chloride Ion

요지

본 연구는 철도 해저터널 라이닝과 교량 구조물에 사용되는 콘크리트의 내구성과 시공성을 동시 확보가능한 최적의 3성분계 결합재 선정을 위하여 특성개선재를 첨가한 결합재 종류 개발제품 A (DP_A)와 개발제품 B (DP_B) 및 보통포틀랜드시멘트(OPC)와 혼화제 A 및 혼화제 B를 사용하여 압축강도 및 내구성을 검토하였다. 압축강도 특성은 16시간 압축강도는 3.0 MPa 이상으로 목표강도 기준을 만족하였으며, 재령 7일에 설계기준강도 30 MPa 이상을 전 수준 모두 상회하는 것으로 나타났다. 결합재 종류에 따른 염소이온 침투저항성은 개발제품 A (DP_A)의 경우 28일 2,741 coulomb 보통, 91일 1,490 coulomb 낮음으로 나타나 염소이온 침투저항성이 가장 우수한 것으로 나타났다. 염소이온 겉보기 확산계수는 장기 재령 91일에서 OPC의 9.55 (× 10-12, m²/sec)와 비교하여 개발제품 B (DP_B)는 9.12 (× 10-12, m²/sec)로 높게 나타났으나 개발제품 A (DP_A)는 4.15 (× 10-12, m²/sec)로 OPC의 약 57% 낮게 나타나 염해내구성이 우수한 것으로 나타났다.

핵심용어: 결합재, 내구성, 3성분계, 염소이온