Research Progress on Volume Stability of Building Materials Containing Carbonated Steel Slag
Steel slag is a solid waste residue produced during steelmaking.China has a huge output of steel slag,but the comprehensive utilization rate is low,occupying land and polluting the environment.It is urgent to realize the resource utilization of steel slag.In recent years,there has been a certain level of utilization of steel slag as a cementitious material or aggregate in building materials.Research and engineering practices have shown that the f-CaO and f-MgO in steel slag can cause volume expansion during hydration in service,leading to poor volume stability of building materials.Therefore,solving the volume stability problem of steel slag is the key to achieving its resource utilization.It has been found that steel slag has a high carbonation reaction activity,and carbonation reaction can consume the f-CaO and f-MgO in steel slag.Carbonation treatment can improve the poor volume stability of building materials containing steel slag,providing a new pathway for the widespread application of steel slag.This paper reviews the research progress on the volume stability of building materials containing carbonated steel slag,introduces the composition and classification of steel slag,discusses the expansion mechanism of steel slag,and summarizes the effects of carbonation factors such as carbonization temperature,water-to-solid ratio,humidity,particle size and gradation,CO2 concentration and pressure,carbonation time,and admixtures on the volume stability of building materials containing steel slag.Based on the current research status and existing issues,research directions for further engineering application of carbonated steel slag in building materials are proposed.
万方数据
维普
