[논문]석회석의 분말도가 시멘트의 물리적 특성 및 환경에 미치는 영향

강인규; 김진만; 신상철; 김건우; 안태윤

doi:10.14190/jrcr.2024.12.1.82

[국내논문] 석회석의 분말도가 시멘트의 물리적 특성 및 환경에 미치는 영향
Effect of Limestone Fineness on Physical Properties and Environmental Impact of Cement 원문보기

Journal of the Korean Recycled Construction Resources Institute = 한국건설순환자원학회 논문집, v.12 no.1, 2024년, pp.82 - 93

강인규 (국립공주대학교 건축공학과) , 김진만 (국립공주대학교 그린스마트건축공학과) , 신상철 (국립공주대학교 친환경콘크리트연구소) , 김건우 (국립공주대학교 건축공학과) , 안태윤 (국립공주대학교 건축공학과)

초록
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시멘트 산업은 클링커 생산 과정에서 약 60 % 이상의 CO₂가 발생하며 이러한 많은 양의 CO₂를 효율적으로 저감 시키기 위해 범세계적으로 시멘트 대체 재료가 활용되고 있다. 대표적으로 활용되는 시멘트 대체 재료는 고로슬래그와 플라이애시가 있으며, 이들은 시멘트 산업을 비롯한 콘크리트용 혼화재료, 지반 고화재 등 다양한 산업에서도 활용되고 있다. 하지만, 각 산업의 탄소중립 전략에 따라 향후 이들의 가용성은 낮아질 것으로 전망되고 있기 때문에 시멘트 산업의 보통포틀랜드시멘트 혼합재 함량 증대 목표를 달성하기 위해서는 새로운 시멘트 대체 재료를 활용해야 한다. 석회석은 이미 시멘트 산업에서 다량 보유하고 있는 재료로 가용성 측면에서 장점이 있으며 분쇄효율이 높아, 해외 선진국에서는 이미 포틀랜드 석회석 시멘트를 표준으로 제정하여 상용화하고 있다. 이와 같은 배경에서 본 연구에서는 국내 PLC의 활용 가능성을 평가하기 위해 석회석의 분말도와 치환율이 시멘트의 물리적 특성에 미치는 영향을 분석하였으며, 탄소중립 관점에서 CO₂ 배출량을 분석하여 시멘트의 환경 영향 평가를 수행하였다.

Abstract ▼ AI-Helper

Since the cement industry generates more than 60 % of CO2 during the clinker production process, supplementary cementitious materials are used worldwide to reduce CO2 efficiently. Mainly used supplementary cementitious materials such as blast furnace slag and fly ash, which are used in various industries including the cement industry, concrete admixtures, and ground solidification materials. However, since their availability is expected to decrease in the future according to the carbon neutrality strategy of each industry, new supplementary cementitious materials should be used to achieve the cement industry's goal for increasing the additive content of Portland cement. Limestone is a material that already has a large amount in the cement industry and has the advantage of high grinding efficiency, so overseas developed countries established Portland limestone cement standards and succeeded in commercialization. This study was an experimental study conducted to evaluate the possibility of utilizing domestic PLC, the effect of fineness and replacement ratio on the physical properties of cement was investigated, and the environmental impact of cement was evaluated by analyzing CO2 emissions.

Keyword

표/그림 (17)

표 Table 1. Overview of experiments
표 Table 2. Composition of binders
표 Table 3. Composition of raw materials assumed based on KS
그림 Fig. 1. Particle size distribution of raw materials
그림 Fig. 2. Insulated box for measuring mortar temperature
표 Table 4. Physical and chemical properties of raw materials
표 Table 5. Fineness of the blended binders
그림 Fig. 3. Schematic diagram for life cycle assessment
그림 Fig. 4. Effect of fineness and replacement ratio of limestone powder on fluidity
그림 Fig. 5. Effect of fineness and replacement ratio of limestone powder on mortar temperature
그림 Fig. 6. Effect of fineness and replacement ratio of limestone powder on setting time
표 Table 6. Result of relative compressive strength based on plain and compressive strength (compressive strength are given in parentheses)
그림 Fig. 7. Effect of fineness and replacement ratio of limestone powder on compressive strength (The linear line indicates the compressive strength of the Plain)
표 Table 7. Result of drying shrinkage
그림 Fig. 8. CO₂eq emissions for the same physical performance level (Based on compressive strength at 28 days)
표 Table 8. Information on CO₂ emissions of the production of raw materials
표 Table 9. Information on CO₂ emissions of manufactured cements

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