Four kinds of SiC bricks bonded with St3C4 and Sialon were analysed microscopically to determine their resistances to oxidation,alkali attack and slag attack.

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.

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.