Effect of coarse aggregates on thermal spalling resistance of refractorycastables for steel ladle linings (Size and amount of coarse aggregates part 1)

摘要

The panel spalling test was conducted on refractory castables forsteel ladle linings to examine the effect of coarse aggregate addition onthermal spalling resistance.Thermal spalling cracks extend almost straightly in castables which include nocoarse aggregate. The cracks in castables which include coarse aggregates,however,deflect or branch due to the collision of cracks with coares aggregates.Such deflecting or branching of cracks are effective to improve thermal spallingresistance of castables. Size and amount of coarse aggregates in castables,regarded as dominant factorfor collision frequency of cracks with coarseaggregates, influence consequentlythermal spalling resistance of castables. Thecollision frequency of cracks withcoarse aggregates can be quantitatively evaluated by the collision probabilitycalculated from cross section and density of coarse aggregate included in acastables.