KR 슬래그 혼입에 따른 고성능 클링커의 CO2 배출계수 및 콘크리트의 내구특성에 대한 실험적 평가
Experimental Evaluation of CO2 Emission Factors and Concrete Durability of High-Performance Clinker with KR Slag Incorporation
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초록
본 연구에서는 제강 부산물인 CaO 풍부 KR 슬래그를 석회석 대신 클링커 원료에 일부 치환해 사용하는 고성능 클링커(HPC)와 고성능 클링커 시멘트(HPCC)의 탄소 저감 효과를 평가했다. Tier 3 방법으로 CO2 배출계수를 산출한 결과, KR 슬래그를 약 4.32% 치환해 만든HPC의 공정 기인 CO2 배출은 OPC 클링커의 약 98.5% 수준으로 나타나, 원료 일부를 KR 슬래그로 대체하면 공정 CO2를 줄일 수 있음을 확인했다. 또한 이 HPC에 혼합재 10%(고로슬래그 5% + 석회석 분말 5%)를 더해 제조한 HPCC는 동일 치환 수준의 OPC와 비교했을 때 탄산화 및 동결–융해 저항성이 거의 동일하여, 성능을 유지하면서 시멘트 산업의 다양한 탄소 저감 기술 중 하나로서 활용 가능성이 있을 것으로 판단된다.
Abstract
This study evaluates the carbon reduction potential of high-performance clinker (HPC) and high-performance clinker cement (HPCC) by partially replacing limestone in the clinker raw mix with CaO-rich KR slag, a by-product of the steelmaking process. KR slag is used as a non-carbonate raw material, and clinker-specific CO2 emission factors were calculated using a Tier 3 methodology for various KR slag replacement levels and raw mix compositions, which were then compared with those of ordinary Portland cement (OPC) clinker. The results showed that when approximately 4.32% KR slag was incorporated into the raw mix to produce HPC, the process-related CO2 emissions of this clinker were about 98.5% of those of OPC clinker, indicating that partial substitution of clinker raw materials with KR slag can reduce process CO2 emissions. Using this clinker, HPCC was produced by adding 10% supplementary cementitious materials (5% ground granulated blast-furnace slag and 5% limestone powder), and the same replacement level was applied to OPC for comparison. Durability tests confirmed that the carbonation and freeze–thaw resistance of HPCC were comparable to those of OPC, demonstrating that HPCC with a high level of supplementary materials can achieve performance equivalent to OPC while having potential significance as a carbon-reduction technology in the cement industry.