The mechanical properties (compressive and flexural strength) of reactive powder concrete (RPC) have been investigated under autoclave curing and compared with standard water curing condition. Three significant parameters in autoclave curing have been investigated; autoclave temperature, pressure and time. The effects of silica fume and steel microfibers incorporation on mechanical performance were also studied. Test results indicate that;,compressive strength of RPC increases significantly after autoclaving compared to the standard water curing. Autoclave time, temperature and pressure also influenced the mechanical performance of RPC considerably. It can be said that, there is critical duration time for each pressure and temperature conditions. The mechanical properties can be influenced negatively beyond this value. Also, SEM micrographs and mercury porosimetry results revealed the transformation of microstructure of RPC caused by autoclaving process. (C) 2013 Elsevier Ltd. All rights reserved.