Earticle

초록

영어

Rapid-hardening concrete (RHC) based on calcium sulfoaluminate (CSA) cement is an established material for emergency infrastructure repairs. However, its high binder demand, accelerated hydration, and susceptibility to autogenous shrinkage-related cracking raise concerns about long-term durability and environmental impact. This chapter investigates the feasibility of partially replacing CSA cement with OLED (Organic Light Emitting Diode) waste glass powder at substitution levels of 0%, 10%, 20%, and 30% by mass of binder, using a fixed water-to-binder ratio of 0.425 and total binder content of 400 kg/m³. OLED glass powder, an aluminosilicate glass recovered from display panel manufacturing, is alkali-free and characterised by a high amorphous SiO₂ content (61.6%), suggesting pozzolanic reactivity and nucleation capability. Fresh concrete properties—slump, air content, and setting time—were evaluated immediately after mixing. Compressive and bond (pull-off) strengths were measured at 4 hours, 1 day, 14 days, 28 days, and 56 days. Microstructural analysis by mercury intrusion porosimetry (MIP) was conducted on the 0% and 10% replacement mixes to elucidate the mechanisms governing performance differences. Increasing glass powder content progressively improved workability (higher slump, lower air content) but delayed setting due to dilution of reactive clinker and an increase in effective free water. At 10% replacement (O-GP10), compressive strength at 4 hours was maintained at an acceptable level (24.2 MPa vs. 25.1 MPa for the control) and marginally exceeded the control at 56 days (45.3 vs. 42.2 MPa). Bond strength in O-GP10 matched the control at 4 hours and consistently surpassed it at later ages. At 20–30% replacement, the dilution effect became dominant, causing pronounced reductions in both early and long-term mechanical performance. MIP analysis showed that O-GP10 suppressed the formation of large pores (>0.1 μm) and promoted a refined pore structure dominated by ultra-fine pores (<0.01 μm). A 10% substitution of OLED waste glass powder is identified as the optimal level for CSA rapid-hardening repair concrete, enabling material-stage CO₂ reduction without compromising the rapid-hardening performance required for immediate traffic restoration.

저자

• Ngan Thanh Vu [ Kumoh National Institute of Technology ]
• Seong-Kyum Kim [ Kumoh National Institute of Technology ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  한국재난정보학회 학술발표대회

• 간기

  부정기

• 수록기간

  2005~2026

• 십진분류

  KDC 338 DDC 361