characteristic strength of concrete formula
The horizontal axis represents the values of compressive strength in MPa. The characteristic strength is defined as the strength of the concrete below which not more than 5% of the test results are expected to fall. He is the author, editor of Civil Planets The compressive strength of the concrete is given in terms of characteristic compressive strength of 150mm sized cubes that is tested at 28 days ( fck).The characteristic compressive strength is defined as the strength of the concrete below which … In the case of cubes the specimen shall be placed in the machine in such a manner that the load shall be applied to opposite sides of the cubes as cast, that is, not to the top and bottom. when new, shall not depart from a plane by more than 0.01mm at any point, and they shall be maintained with a permissible variation limit of 0.02mm. The design strength is 28.5 N/Sqmm, and the characteristic strength of concrete is 25 N/Sqmm. Characteristic Strength of Concrete The term characteristic strength means that value of strength of material below which not more than 5% of the test results are expected to fall. For certain applications and structures, concrete mixes can be designed to obtain very high compressive strength capacity in the range of 500Mpa, usually referred as Ultra High Strength Concrete or Powder Reactive Concrete. The value of f ck for different grades of concrete are specified by IS code 456:2000 and given in Table 1.1.
The characteristics compressive strength of concrete is defined as the mean strength below which 5% results are not allowed to fall.
Little Confusing? The compressive strength of concrete is given in terms of the characteristic compressive strength of 150 mm size cubes tested at 28 days (fck)- as per Indian Standards (ACI standards use cylinder of diameter 150 mm and height 300 mm).
Compressive strength of concrete depends on many factors such as water-cement ratio, cement strength, quality of concrete material, quality control during the production of concrete, etc. According to Wikipedia, Compressive Strength of concrete is defined as the Characteristic strength of 150mm size concrete cubes tested at 28 days. A good concrete should not fall under less than 5% of desired concrete strength.
The maximum load applied to the specimen shall then be recorded and the appearance of the concrete and any unusual features in the type of failure shall be noted.The measured compressive strength of the specimen shall be calculated by dividing the maximum load applied to the specimen during the test by the cross sectional Area, calculated from the mean dimensions of the section and shall be expressed to the nearest kg per cm2. As the name suggests, the difference in both the tests are in the shape of test specimens. Take a look at the below table. The term characteristic strength means that value of strength of material below which not more than 5% of the test results are expected to fall. For normal field applications, the concrete strength can vary from 10Mpa to 60 Mpa. Every material has its own resistance strength.
At higher rate of loading, the compressive strength increases. In technical point of view, Compressive Strength of concrete is defined as the Characteristic strength of 150mm size concrete cubes @28 days. As the spherically seated block is brought to bear on the specimen the movable portion shall be rotated gently by hand so that uniform seating may be obtained. As a thumb rule, the Following procedure is adopted to determine the Capacity of concrete as per Indian Standards.Testing Machine: The testing machine may be of any reliable type of sufficient capacity for the tests and capable of applying the load at the specified rate. Characteristic strength of concrete is the strength of concrete specimens casted and tested as per given code of practice and cured for a period of 28 days; 95% of tested cubes should not have a value less than this value.
The dimensions of the specimens to the nearest 0.2mm and their weight shall be noted before testing.Placing the specimen in the testing machine the bearing surface of the testing machine shall be wiped clean and any loose sand or other material removed from the surface of the specimen.
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