混凝土强度等级，翻译

The use of standard test block (normative provisions of the edge length of 150mm concrete cube), in standard conditions (temperature of 20 ℃ ± 3 ℃, relative humidity of 90% or more) the conservation of 28 days, according to the provisions of the standard test method (load center , average speed of 0.3 ~ 0.8MPa / s, sample lubricant coated surface from top to bottom) measured with a 95% guarantee that the rate of compressive strength as the compressive strength of concrete cube. , Concrete strength grade in accordance with standard values to determine the cube compressive strength, using symbols fcuk said that a total of 14 levels, of which, C50 and C50 high-strength concrete above.

By cubic compressive strength here we mean a term for a compressive strength value with 95% of guarantee rate measured by standard test method ( loaded in center at loading speed of 0.3～0.8MPa/s,with no lubricant on the top surface or under the bottom surface of specimen) which uses standard blocks (concrete cubes with side length of 150mm to standard specifications) cured under standard condition (temperature for 20℃±3℃, relative humidity of 90% or even higher) for 28 days. Concrete strength grade is determined by cubic compressive strength, it is expressed as the Symbol of fcu,k, there are 14 grades in all,among these ,C50 and the higher strength grades are high strength concrete.

Using standard test (code length for the concrete cube 150mm), in the standard conditions (temperature is 20 ° c, the relative humidity of ± 3 in 90%) maintenance 28 days, the standard that presses a regulation test method (center for loading, average speed of 0.3 ~ 0.8 MPa/s, specimen surface coating and lubricant) measurement assurance with 95% of the compressive strength of concrete cube is called the compressive strength. According to the cube concrete strength, compressive strength, with standard fcuk symbols, altogether 14 of them, C50 and the higher levels are for high strength concrete.