... /h Working productivity:20-22m3/h high output 25m3/h JS500 portable concrete mixer Put water,cement,sand and stones at the rate ... -dry concrete is OK)into the concrete mixer,operate the mixer,run 60 seconds or so(it is suitable for JS500),then stop,The concrete is ... )etc welcome you contact me~~~~ 3,Our equipments in Sebria JS500 concrete mixer machine