The	resistance	to	wear	or	hardness	is	one	of	the	important	
properties	of	road	aggregates.The	purpose of	the	Los	Angeles	test	is to	measure	degradation	of	
mineral	aggregates	of	standard	grading	caused	by	group	of	action	
involving abrasion,	attrition,	impact	and	grinding	in	a	rotating	
steel	drum	containing,	a	specified	number	of	steel	spheres,	the	
number	depending	upon	the	grading	of	test	sample.After	the	prescribed	
number	of	revolutions,	the	contents	are	removed	from	the	drum	
and	the	aggregate	portion	is	sieved	to	measure	the	degradation	
as	percent	loss.That	means	the	
aggregates	should	be	hard	enough	to	resist	abrasion.