which are to be in contact with the compression platens. Load should be applied gradually at the rate of 140 kg/cm2 per minute till the Specimens fails.

shall be made for testing at each selected age.Specimens stored in water shall be tested immediately on removal from the water and while they are still in the wet condition. the center of which coincides with time central point of the face of the platen. GEN1 GEN1 is an extremely versatile mix used throughout the construction industry for general and housing applications. For most of the works cubical molds of size 15cm x 15cm x 15cm are commonly used.The compression testing machine is used for testing the compressive strength of concrete.Load should be applied gradually at the rate of 140 kg/cm2 per minute till the Specimens fails.American Society for Testing Materials ASTM C39/C39M provides Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens.This site is very useful full of information serves as Guide book -CIVIL !! Cube or Cylinder samples are usually tested under a compression testing machine to obtain the compressive strength of concrete. When shown on the plans or allowed, provide Class HES concrete for very early opening of small pavement areas or leave-outs to traffic. If its not achieved, then concrete is rejected. By this single test one judge that whether Concreting has been done properly or not.Concrete compressive strength for general construction varies from 15 MPa (2200 psi) to 30 MPa (4400 psi) and higher in commercial and industrial structures.Compressive strength achieved by concrete at 7 days is about 65% and at 14 days is about 90% of the target strength.A concrete cube test or concrete cylinder test is generally carried out to assess the strength of concrete after 7 days, 14 days or 28 days of casting.For cube test two types of specimens either cubes of 15cm X 15cm X 15cm or 10cm X 10cm x 10cm depending upon the size of aggregate are used.

The compressive strength of any material is defined as the resistance to failure under the action of compressive forces. You will receive a link and will create a new password via email.Sorry, you do not have permission to ask a question, You must login to ask question. Concrete mixes are defined in ascending numbers of 5, starting at 10, and show the compressive strength of the concrete after 28 days. The permissible error shall not be greater than 2 percent of the One of the platens shall be fitted with a ball seating in the form the portion of a sphere. a M20 concrete will fail in 5 to 6 seconds.I am looking for this article.. fortunately with your help I got it thanks for sharing..