AS 1012.10:2000 pdf free download – Methods of testing concrete Method 10: Determination of indirect tensile strength of concrete cylinders (‘Brazil’or splitting test)

AS 1012.10:2000 pdf free download – Methods of testing concrete Method 10: Determination of indirect tensile strength of concrete cylinders (‘Brazil’or splitting test).
3.2 Selection of plane of loading
The best position for the plane of loading shall be selected before the cylinder is tested. The plane of loading shall be such that the lines of contact with the bearing strips are the most nearly straight and parallel that can he found. A straightedge shall he used to find the best lines. The selected plane shall be marked by drawing a diametral line upon each end of the cylinder. The lines shall be drawn using a suitable device that will ensure that they are in the same axial plane.
4 AI’I’ARATUS
4.1 Testing machines
The testing machine shall comply with the following requiremenis:
(a) It shall meet the requirements of Grade A machines as defined in AS 2193. for the relevant range of compressive forces.
NOTE: The machine needs to be suitable for the range required since this test is normally carried out at a lower range of force than that specified in AS 1012.9.
(h) It shall he power operated and capable of applying compressive forces increasing continuously at the rate of loading in the manner specified in Clause 5(e).
(c) It shall be fitted with a device for controlling the rate of loading, which shall be capable of operating at the rate of loading specified in Clause 5(e).
(d) It shall be fitted with two steel compression platens. lithe relevant dimension of either of the platens of the testing machine is less than the length of the specimen. or if the relevant dimension of the upper platen is longer than the testing jig when used, a supplementary hearing plate or bar of machined steel shall he placed between the particular platen and the jig.
(e) If the hearing surface of either platen departs from plane by 0.1 mm at any time during service, a supplementary bar or plate placed as described in Clause 4.3 shall be used.
(fl The centre of curvature of the spherical seat shall be on the vertical axis of the upper platen and shall be within 6 mm of its bearing surface. The upper platen shall be capable of limited movement and tilting by at least 3 degrees in any direction. The spherical seat shall be free from grit and other foreign matter and shall be lubricated at all times (see Note).
NOTE: Where the spherical seating is accessible, it should be cleaned regularly and should be lubricated with a thin film of light non-polar oil, Where the spherical seating is sealed, the manufacturer’s recommendation for crect maintenance of the seating should be followed.
4.2 Testing jig
An appropriate steel testing jig may he used when testing the specimen. A jig of suitable design is illustrated in Figure 1.
7 PRECISION STATEMENT
For pairs of 150 mm diameter x 300 mm long cylinders, made from sample. cured in similar conditions and tested in accordance with this Standard, the repeatability expressed as a percentage of the mean of the two strengths obtained, is 14 percent at the 95 percent probability level. No precision data is available for concrete compacted by ramming.
The following information shall be recorded for each test specimen:
(a) Identification of concrete.
(b) Job site or laboratory where tested.
(C) Date and time of test.
(d) Age of specimen at date of test, if known.
(e) Moisture condition of specimen, where applicable.
(f) Any apparent defects of the specimen.
(g) Dimensions of specimen.
(h) Curing history of specimen.
(i) Force at failure.
(j) Indirect tensile strength, calculated to the nearest 0.1 MPa.
(k) Appearance of concrete in fracture surfaces, and type of fracture, if these are unusual.
(I) Any other sign ificani factors noted before, during or after testing.
(m) Identification of the operator carrying out the test.
(n) Reference to this Standard. i.e. AS 101110.
9 REPORT
The following information shall be reported:
(a) Identification of concrete.
(b) Date and location of test.
(c) Age of specimen at date of test, if known.
(d) Indirect tensile strength, calculated to the nearest 0.1 MPa.
(e) Dimensions of specimen. and curing history ot specimen.