Abstract： AS 4133.4.3.2:2013 pdf download.Methods of testing rocks for engineeringpurposes Method 4.3.2: Rock strength tests— Determination of the deformability of rockmaterials in uniaxial compression-Rockstrength less than 50 MPa. 4.2 Specimen pr...

AS 4133.4.3.2:2013 pdf download.Methods of testing rocks for engineeringpurposes Method 4.3.2: Rock strength tests— Determination of the deformability of rockmaterials in uniaxial compression-Rockstrength less than 50 MPa.

4.2 Specimen preparation

The test specimen shall be prepared as follows:

(a) From a suitable sample prepare a test specimen having the following characteristics:

(b) Test specimen shall be a straight circular cylinder having a length to diameter ratio of between 2.5 and 3.0 and a diameter

preferably of not less than 45 mm. The diameter of the specimen shall be at least ten times the size of the largest grain in the

rock.

NOTE: While a test specimen length to diameter ratio in the range of 2.5 to 3.0 is spcifled. in accordance with that rvcommnded by ISRM. it is rcogniied that there is evidence suggesting that a minimum length to diameter ratio of 2.0 may be adequate

particularly for rocks with strength less than 25 MPa. Therefore, while a ratio of between 2.5 to 3.0 is preferred. ii is possible to extend this range to between 2.0 and 3.0 to allow additional testing where the core lengths are limited. Where the ratio is

less than 2.5. it should be noted in the test report.

(ii) The ends of the specimen shall he cut parallel to each other to within 10 and at right angles to the sides of the specimen to within 10.

Recommended：