The distensibility of BOF slag was measured by steam test method and the effect of size and ageing time on the distensibility was investigated.These gives evidence for application of BOF slag.

• 实验采用压蒸法测定了转炉渣的膨胀性，分析了粒度和陈化时间对转炉渣膨胀性的影响，为转炉渣的应用提供依据。