Polished stone value

Abrasion resistance. The resistance of aggregates to abrasion is measured in terms of the aggregate abrasion value and the polished stone value (see section 6.4.3). An alternative measure is the Bond Work Index [3.3], which ranges from 4 kW-hr/t for soft limestones, to about 10 for typical dense limestones. 

Other mechanical test procedures are given in BS 812, namely the aggregate crushing value, aggregate abrasion value and the polished stone value. Other tests are widely used, such as the Los Angeles test for impact resistance [8.6]. 

Polished stone value (PSV) is the resistance of an aggregate to polishing, using the accelerated polishing test in BS 812. High values indicate increased resistance to polishing. 

CEN EN 1097-8.2009. Tests for mechanical and physical properties of aggregates - Part 8 Determination of the polished stone value. Brussels CEN. 

Other geometrical and physical tests on the aggregates of the RA (angularity, resistance to fragmentation, resistance to polishing polished stone value [PSV], resistance to surface abrasion aggregate abrasion value [AAV], particle density, water absorption, etc.) may also be necessary to be determined when comprehensive mix design is followed. 

Rock type Water absorption Specific gravity Aggregate crushing value Aggregate impact value Aggregate abrasion value Polished stone value... 

The Mohs hardness test (the word scratch is assumed) is almost a nondestructive test. The hardness of a gemstone is usually referred to as its Mohs hardness. Since this hardness value is determined by a scratch test, it is not actually a hardness. The scale has many drawbacks including the fact that it is not linear, it does not necessarily relate to wear resistance, and it damages the specimen so it is not ideal for polished stones. 

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