28/02/2024
The following information is for the people who are involved in the aggregates business in Guyana. Will see that the Limestone is harder than Granite once is used in construction.
The cited test is "Los Angeles Abrasion Test".
‘’ A low LAV indicates that the material has high abrasion resistance. Conversely, a high LAV indicates that the material has low abrasion resistance ‘’ (Mohajeran, 2017).
‘’Larger the LAA value, softer will be the aggregate. Smaller the value, harder will be the aggregate’’ (Mohajeran,2017).
The following is the table indicating the Abrasion degradation values of various types of rocks: Table2.1.2 collected from (Mohajeran, 2017)
Aggregate type Los Angeles Abrasion value (%)
Basalt 10-17
Dolomite 18-30
Gneiss 33-57
Granite 27-49
Limestone 19-30
Quartzite 20-35
(Mohajeran, 2017) says that factors affecting the Los Angeles Abrasion value are the grainsize and shape of the minerals, the nature and strength of the interlock between the mineral grains and the degree of weathering of the rock.
