Patent ID: 7624625

Claim:
A rheometer ( 200 , 300 ) used to measure rheology of a cement-based material, comprising: a drum ( 210 , 310 ) used to accommodate cement-based material; a shaft ( 220 , 320 ) having one end pushed into the drum ( 210 , 310 ); a rotational speed controller ( 230 ) configured to adjust rotational speed of the shaft ( 220 , 320 ) or the drum ( 210 , 310 ); and at least one adaptive vane assembly ( 240 , 340 , 280 , 290 ), which is replaceably connected to the shaft ( 220 , 320 ), wherein the adaptive vane assembly ( 240 , 340 , 280 , 290 ) contains at least two vanes ( 241 , 281 , 291 ), wherein the ratio (r 1 /r 0 ) of radius (r 1 ) of the said adaptive vane assembly ( 240 , 340 , 280 , 290 ) to radius (r 0 ) of the drum ( 210 , 310 ) is between 0.1˜0.6.