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전기로 산화슬래그 골재의 체적안정성 평가에 관한 실험적 연구

Experimental Study on Evaluation on Volume Stability of the Electric Arc Furnace Oxidizing Slag Aggregate

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키워드

주제분류안전공학

초록

본 논문은 전기로 산화슬래그 골재의 체적안정성 평가를 위해 전기로 산화슬래그 골재의 물리적·화학적 특성을 검토하고, 전기로산화슬래그 골재의 체적안정성 실험을 진행하였다. 체적안정성을 검토하기 위하여 물리적·화학적 방법을 고안하여 실험을 진행하였다. 물리적 방법으로는 오토클레이브의 고온·고압을 이용하여 전기로 산화슬래그 골재의 체가름 변화를 확인하는 방법과 모르타르바를 제작하여 길이변화율에 따른 체적팽창성을 확인하였다. 화학적 방법으로는 Ethylene glycol 시험법을 이용하여 전기로 산화슬래그 골재의 free CaO 함량을 정량 평가하였다. 전기로 산화슬래그 골재의 free CaO 정량 평가 결과 0.5% 이하의 함량으로 나타났으며, 화학 분석 결과 KS F 4571의 CaO40%이하로 확인 되었다. 전기로 산화슬래그의 free CaO가 소량 함유됨에 따라 건설재료로서의 가능성을 확인하였다.

Abstract

As the amount of slag generated annually increases, attempts to recycle slag as high value products are underway in order to develop anefficient resource recycling industry based on slag and derive economic benefits as well. However, the application of electric arc furnace (EOS) slagas construction material is practically limited because of the unstable substances included in it, such as free CaO.(EOS contains a small amount of freeCaO, but several limitations still exist. Slag is stored for more than 3 months depending on the quantity of slag, which leads to additional economicloss. In this study, the amount of free CaO present in EOS is quantitatively evaluated to examine its qualities as a potential construction material andverify its application as concrete material. The quantitative analysis of free CaO present in EOS is performed using ethylene glycol. The free CaO contentsof EOS samples were found to be below 0.5%. This satisfies the criteria specified in KS F 4571, which states that the CaO content should be below40% and CaO/SiO2 ratio should be below 2.0. In addition, it was confirmed that free CaO content difference appears to be dependent on the agingperiod and storage position.

참고문헌 (31)

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