Effects of Steelmaking Slag and Moisture on Electrical Properties of Concrete

Materials

Young-Soo Yoon¹  Tian-Feng Yuan¹  Jin-Seok Choi¹  Se-Hee Hong¹ 

[1] School of Civil, Environmental and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Korea;

关键词: steelmaking slag;    setting times;    compressive strength;    electrical resistivity;    electrical piezoresistivity;    electrical sensitivity;   

DOI  :  10.3390/ma13122675

来源: DOAJ

【 摘 要 】

Strain sensors can indicate the conditions of concrete structures, but these sensors are only capable of measuring local behaviors of materials. To solve this problem, researchers have introduced conductive materials that can monitor the overall behavior of concrete structures. Steelmaking slag, which contains large amounts of iron oxide (Fe₂O₃), is conductive, and researchers have considered the addition of this material to improve concrete monitoring. In this study, mechanical and electrical properties of concrete containing steelmaking slag as a binder were evaluated. As the incorporation of steelmaking slag increased, the setting times were delayed, but the compressive strengths were similar within the replacement ratio of 15%. It was found that the addition of steelmaking slag with Fe₂O₃, the main ingredient of magnetite (Fe₃O₄), improved the electrical resistivity, piezoresistivity, and sensitivity of the concrete. Drying of the concretes resulted in an increase in electrical resistance and fractional change in resistivity (FCR). Expansion of steelmaking slag, due to contacting of free CaO and moisture under repeated loads, resulted in cracks in the concrete and affected the gauge factor (GF). This study demonstrates the possibility that the addition of steelmaking slag as a binder may provide an economical and environmentally-friendly solution to concrete strain monitoring.

【 授权许可】

Unknown