AS 4133.4.3.2:2013 pdf free
AS 4133.4.3.2:2013 pdf free.Methods of testing rocks for engineering purposes
The test specimen shall be prepared as follows:
(a) From a suitable sample prepare a test specimen having the following characteristics:
(i) Test specimen shall be a straight circular cylinder having a length to diameter ratio of between 2.5 and 3.0 and a diameter referably 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 specified, in accordance with that recommended by ISRM, it is recognized 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, it 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 be cut parallel to each other to within 1° and at right angles to the sides of the specimen to within 1°.
(iii) The ends of the specimen shall be ground flat to 0.1 mm across the face with no surface irregularities. If the ends of the specimen cannot be ground or contain surface irregularities they may be capped using a capping material that has a strength greater than 50 MPa.
(iv) The sides of the specimen shall be free of abrupt irregularities and straight over the full length of the specimen.
(b) Determine the average original diameter of the specimen to at least the nearest 0.1 mm across two diameters at right angles and at the centre and near the top and bottom of the specimen. Calculate the average original diameter (do) of the test specimen from the six measurements.AS 4133.4.3.2 pdf free download.
