A Study on The Relationship between Aggregate Impact Values (AIV) and Los Angeles Abrasion Values (LAAV) of Charnockites/Charnockitic Gneisses in Sri Lanka

Abstract

The quality of construction works in Civil Engineering largely depends on the properties of mall-rials. The properties of rock aggregates depend upon the natural conditions of different rock types. It has IHHMI understood that the changes of engineering properties in different rock types may be related In llu 1 rock texture. Therefore studies on the engineering properties of different rock types provide prior I iinwk'dge on the quality of such rock types as well as on potential locations of suitable sources for Industry. Aggregate Impact Values and Los Angeles Abrasion Values are the most important tJiigiiu-ering properties of rock materials for road constructions and Charnockite/Charnockitic Gneiss is Ilii-widely distributed metamorphic rock in Sri Lanka. The objective of this research is to find out the relationship between AIV and LAAV of Charnockite/Charnockitic Gneiss in Sri Lanka. A hundred and sixty seven (167) Charnockite/Charnockitic gneiss rock samples were collected from ijii.ii ries and exposed rocks in different localities in Sri Lanka, except in the Northern and the Southern I'loviiuvs, and tested for their Aggregate Impact Values and Los Angeles Abrasion Values. The results urn 1 interpreted in different ways and it was found that the ratio of LAAV/AIV for Charnockite/ (lumockitic Gneiss is 1.242 + 0.115. The average values for AIV and LAAV of Charnockite/ < h,n Mockitic Gneiss rock are 23% and 29% respectively.