Theory the los angeles test is a measure of

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Theory: The Los Angeles test is a measure of degradation of mineral aggregates of standard grading resulting from a combination of actions including abrasion or attrition, impact, and grinding in a rotating steel drum containing a specified number of metallic spheres, As the drum rotates, a shelf plate picks up the sample and the metallic spheres, carrying them around until they are dropped to the opposite side of the drum, causing an impact-crushing effect. The contents then roll within the drum with an abrading and grinding action until the shelf plate impacts and the cycle is repeated. 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. The Los Angeles (L.A.) abrasion test is a common test method used to indicate aggregate toughness and abrasion characteristics. Aggregate abrasion characteristics are important because the constituent aggregate in construction use must resist crushing, degradation and disintegration in order to produce a high quality work. & the Los Angeles is defined as the resistance to degradation of small-size coarse aggregate by abrasion and impact in the Los Angeles machine by AASHTO T 96 & ASTM C 131 standard tests. The percentage of abrasion by using Los Angeles test is
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