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Test method T223 - Roads and Maritime Services

The point load test provides a fast and economic method for evaluating the UCS of rock specimens. The point load strength index (I s50) is empirically correlated to the UCS. There is a plethora of correlations for estimating the UCS from the point load strength index, as summarized in Table 1. A review of published literature shows the ...

Point Load Index Tester - Tinius Olsen

Point load test Correlation Laboratory test Brazilian Traction Unconfined compres-sion strength Direct measurement Table 1. Methods for determining the unconfined compression strength, [4] The Point Load Test (PLT) allows us to determine the Point Load Resistance Index or Point Load Strength, (I s(50)). It is useful in classifying rocks by ...

How to Calculate a Point Load | Sciencing

1.1 This test method covers the guidelines, requirements, and procedures for determining the point load strength index of rock. This is an index test and is intended to be used to classify rock strength. 1.2 Specimens in the form of rock cores, blocks, or irregular lumps with a test diameter from 30 to 85 mm can be tested by this test method.

STANDARD OPERATING PROCEDURE No. 77 POINT LOAD …

Digital Point Load Tester, Point-Load Strength Test Originally developed at Imperial College, London, the apparatus comprises a two-column fixed crosshead frame and a hand operated hydraulic jack. Pressure applied by the jack extends the piston carrying the lower conical point.

Standard Test Method for Determination of the Point Load ...

4.2 Point Load Test Results The results of the point load test are given in Table 3. The point load strength index values range from 0.36 MPa for the Jutana Sandstone to 5.24 MPa for the Dandot Sandstone. The coefficient of variation ranges from 5.3 % for Dandot Sandstone to 60.7% for Jutana Dolomite. Broch and Franklin [5] report that the

Correlation between Uniaxial Compressive Strength and ...

Point Load Test (2016) Based on the cooperation between Prof. Seokwon Jeon from Seoul National University(South Korea) and the ISRM Commission on Testing Methods, video films on the ISRM Suggested Methods, which are made for educational purpose, will be embedded in the Commission's website. It is an attempt by the Seoul National University to ...

ELE International - Digital Point-Load Test Apparatus

The Digital Point Load Tester consists of a load frame for applying loads up to 55kN, on which a manual hydraulic jack is mounted. The tester accepts core specimens up to 101.6mm (4) in diameter. The load is applied by two point load platens and a graduated scale indicates the distance between the conical points.

Estimate of Uniaxial Compressive Strength of ...

Relationship between irregular lump point load strength index and uniaxial compressive strength in the forced-dry state (a), forced-wet state (b), forced-dry and forced-wet states (c), natural-moist state (d), and relationship between number of irregular lump point load strength test specimens and coefficients of variation (e).

Point load testing of weak rocks with particular reference ...

Point Load Index Tester - Hand Operated - (PIT-01) Ask for Price Used for testing rock, aggregate and core samples as well as out crop specimen in their original shape.

Point-Load Test | Mining | SGS

The Point Load Test is primarily an index test for strength classification of rock materials. This instrument is mainly intended for field measurements on rock specimens but it can also be used in the laboratory. The results of the test may also be used to predict the uniaxial compressive strength of rock from correlations.

Point Load Test | JKTech

In a Point Load Test, a sample of rock is mounted between two pointed plates and pressure is applied until failure of the sample occurs. The peak applied load is recorded. This is repeated on a minimum of 20, ideally 50 pieces of rock within a sample with the results used to calculate the Point Load Index.

ISRM

5.2 The point load strength test is used as an index test for strength classification of rock materials. The test results should not be used for design or analytical purposes. 5.3 This test method is performed to determine the point load strength index of rock specimens and, if required, the point load strength anisotropy index.

Point-load strength: An index for classification of rock ...

calculation of the point load strength index. There are three basic types of point load tests: axial, diametral, and block or lump. The axial and diametral tests are conducted on rock core samples. In the axial test, the core is loaded parallel to the longitudinal axis of the core, and this test is most comparable to a UCS test. The point load ...

Standard Test Method for Determination of the Point Load ...

The Point Load Test (PLT) was developed as an index test to predict the Uniaxial Compressive Strength (UCS) of core too broken for UCS testing. A correlation factor (K) between UCS and PLT strength of 24 has been proposed although this value is disputed.

THE POINT-LOAD STRENGTH TEST - ResearchGate

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Conversion of Point Load Test Results to Conventional ...

The Point Load strength test is based on the indirect tensile strength test or rock core by fracturing a ... for different size samples which is then corrected to a standard 50 mm size equivalent, the Point Load Strength Index (I. s(50) ... Test method T223 - Determination of the point load strength of rock specimens 3 of 5 . October 2012 .

IS 8764: Method of determination of point load strength ...

The Point-load Test measures the Point Load Strength Index (Is(50)) of rock specimens, and their Strength Anisotropy Index (Ia(50)), which is the ratio of Point Load Strengths in directions that give the greatest and least values.

Digital Point Load Tester - Point Load - Impact - civil ...

such as the point load test can be used in the field to reduce the time and cost of compressive strength tests. 5.2 The point load strength test is used as an index test for strength classification of rock materials. The test results should not be used for design or analytical purposes. 5.3 This test method is performed to determine the point