An observation plots is allocated in the spoil ground in Hurong west expressway so as to study the characteristics and process of detritus erosion during the construction of expressway.

Based on the service conditions of the lance for molten iron pretreatment,this paper analyzes the grain size distribution and the selection of the micro-powder and admixtures,and probes into the influences of introducing the andalusite and carborundum on its thermal shock resistance and slag resistance.