钢渣特性及在土建工程中的利用

Characterization and Utilization of Steel Slag in Civil Engineering

在我国钢渣利用率仅为20%左右,而在发达国家却高达90%以上;钢渣得不到利用会造成资源浪费和环境污染问题,有必要提高其利用率.钢渣预处理方法有:热泼法、水淬法、风碎法、热闷法和湿式磁选法等,不同预处理方法会不同程度影响钢渣矿物成分.钢渣的主要矿物成分是C2S和C3S,具有潜在胶凝特性,但需要采用一定的方法来进行激发,目前常用的激发方法为物理激发、化学激发和热力激发.钢渣在土建工程中再生利用途径主要有:作为水泥、混凝土、沥青的胶凝材料或骨料,在回填工程中作为填筑材料;在混凝土中作为胶凝材料等.

Approximately 20 per cent of steel slag is reused in China, while more than 90 per cent of that is reused in developed countries. It is essential that steel slag be made use of, because inappropriate handlings of steel slag causes wasted resources. Approaches to pre-processing steel slag include hot water spray, water quenching, air quenching,pyrolytic converter method and wet magnetic separation, and different pretreatment methods will have different impacts on the mineral composition of slag. The main mineral composition of steel slag is C_2S, and C_3S, which have potential cementitious properties and need to be activated in some way. Currently, mechanical method, chemical method, and thermodynamic method are commonly used for activation. The ways in which steel slag is recycled in civil engineering are：cementitious material or aggregate filling in cement, concrete, and asphalt, a filling material for backfill engineering, and a cementitious material for civil engineering, etc.