Physical and mechanical properties of typical metamorphic rock aggregates selected from different places in the southeast area of Guizhou province were studied,and their alkali reactivity characteristics was studied using test methods such as petrographic analysis,rapid steam curing method and mortar-bar method.The results indicate that physical properties of these metamorphic rock aggregates are as follows: high content of needle and plate-like particles and rock powder,and high fineness modulus.Metamorphi...