准确差异混凝土强度等级(国外英文资料).docVIP

正确区别混凝土强度等级(国外英文资料) How is the strength of the concrete determined? What are the levels of ordinary concrete? Standard cube compressive strength of concrete (or the cube compressive strength standard values) refers to the method according to the standard production and maintenance of side length is 150 mm cube specimens, in the age of 28 d, with a standard test method for measurement of compressive strength has no less than 95% of the overall distribution of reliability of the compressive strength value, fcu, k said. Concrete strength grade is according to the concrete cube compressive strength of standard to differentiate, the symbols C and the cube compressive strength standard values (in MPa) said. Ordinary concrete is divided into C15, C20, C25, C30, C35, C40, C45, C45, C55, C65, C65, C75, C75, C75, C75 and C80 in 14 levels. The strength level of the concrete is determined by the standard value of the cube with 95% assurance. A. 3 d, 7 d, 28 d B. 3 d, 28 d C. 7 d, 28 d 28 D D. Resolve the correct answer is d. concrete strength grade is according to the concrete cube compressive strength of standard to differentiate, USES symbols C and the cube compressive strength standard values (in MPa) said. Standard cube compressive strength of concrete (or the cube compressive strength standard values) refers to the method according to the standard production and maintenance of side length is 150 mm cube specimens, in the age of 28 d, with a standard test method for measurement of compressive strength has no less than 95% of the overall distribution of reliability of the compressive strength value, fcu, k said. The compressive strength of the soil is the maximum stress that the standard test is able to bear under the pressure of the unit area under pressure. As a measure of quality of concrete, it is used as a basis for determining the strength level. 1, cube compressive strength (fcu)? ????? Made according to the method of making the standard length is 150 mm cube specime