Editing Building stones of Edinburgh: tests and properties

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The specimen of rock is compressed between two hardened steel points until it splits, the failure being predominantly due to tensile stress induced perpendicularly to the plane of loading. The points are hardened steel cones, rounded to a radius of 5mm at their tips. The points may be fitted to a laboratory testing machine or used in a light portable rig, using a hand-operated hydraulic jack to apply the load. Specimens may be pieces of drill core or fragments of rock about 50mm in diameter. The length is normally between one and two times the diameter. Correction factors have been developed for application to results obtained on specimens which are above or below the recommended sizes. The point-load strength index is expressed as P/D2 where P is the load at failure in MN (MegaNewtons) and D is the diameter of the specimen in metres. Some workers have shown a relationship between the point-load index and compressive strength but, in general, insufficient results are available to make other than a generalised relationship.
 
The specimen of rock is compressed between two hardened steel points until it splits, the failure being predominantly due to tensile stress induced perpendicularly to the plane of loading. The points are hardened steel cones, rounded to a radius of 5mm at their tips. The points may be fitted to a laboratory testing machine or used in a light portable rig, using a hand-operated hydraulic jack to apply the load. Specimens may be pieces of drill core or fragments of rock about 50mm in diameter. The length is normally between one and two times the diameter. Correction factors have been developed for application to results obtained on specimens which are above or below the recommended sizes. The point-load strength index is expressed as P/D2 where P is the load at failure in MN (MegaNewtons) and D is the diameter of the specimen in metres. Some workers have shown a relationship between the point-load index and compressive strength but, in general, insufficient results are available to make other than a generalised relationship.
  
== Test results for a selection of building stones ==
 
  
 
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