Abstract
The quality of construction works in Civil Engineering largely depends on the properties of materials. The properties of rock aggregates depend upon the natural conditions of different rock types. It has been understood that the changes of engineering properties in different rock types may be related to the rock texture. Therefore, studies on the engineering properties of different rock types provide prior knowledge 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 engineering properties of rock materials for road constructions and Charnockite/Charnockitic Gneiss is [he 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 quarries and exposed rocks in different localities in Sri Lanka, except in the Northern and the Southern provinces, and tested for their Aggregate Impact Values and Los Angeles Abrasion Values. The results were interpreted in different ways and it was found that the ratio of LAAV/AIV for Charnockite/ Charnockitic Gneiss is 1.242 + 0.115. The average values for AIV and LAAV of Charnockite/ Charnockitic Gneiss rock are 23% and 29% respectively.
Highlights
The quality of construction works in Civil Engineering largely depends on the properties of mall-rials
A hundred and sixty seven (167) Charnockite/Charnockitic gneiss rock samples were collected from i j i i . i i 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 variation shows an increase of Los Angeles Abrasion Values (LAAV) with the increase of Aggregate Impact Value (AIV)
Summary
The quality of construction works in Civil Engineering largely depends on the properties of mall-rials. 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. Introduction t'lii rocks have been classified as igneous, oi'ilimentary and metamorphic according to tlu'ir origin, texture and mineralogy This ' l.iv.ificalion is not valid for engineering science I'ri ,iuse rock is another material. The results of a part of this research have been published and are available [1] for reference It highlights the values of different engineering properties of Sri Lankan rocks and the interrelationship among them. The rocks of quarries which are used as highway materials in Sri Lanka belong to basically either metamorphic type or igneous cordierite gneiss, wollastonite-scapolite gneiss, granitic gneiss) and amphibolites All of these are considered as meta-sedimentary rocks[4]
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