Aggregate abrasion 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. 

Part 113 Method for determination of aggregate abrasion value (AAV) ... 

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]. 

Aggregate abrasion value (AAV) is (he resistance of an aggregate to abrasion, as measured by the aggregate abrasion test. Low values indicate increased res-isUmce to abrasion. 

Part 112 Method for determination of aggregate impact value (AIV) , 1990. Part 113 Method for determination of aggregate abrasion value (AAV) , 1990. 

The hardness of aggregate chippings is mainly determined by their resistance to polishing (PSV). However, the resistance to fragmentation by Los Angeles (LA) as well as the resistance to aggregate abrasion value (AAV) should also be taken into account. 

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 British Standard Institute. 1999. Aggregate Abrasion Value. Standard BS 812. Pt 113. London The British Standard Institute. 

Coal ash was converted to a low-carbon vitreous slag, impervious to leaching and valued as an aggregate in construction or as grit for abrasives and roofing materials trace metals from petroleum coke were also encased in an inert vitreous slag. 

The aggregate of the target mixture is proposed to fall within the limiting values stated in Table 6.1. Table 6.1 also gives the limiting values for sand equivalent, LA abrasion and per cent of crushed faces specified by Asphalt Institute (2008) for DGCAs. 

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