Abrasion test - tests on stones, Civil Engineering

Abrasion Test:  

This test is carried out on stones used as aggregates for road construction. The test result shows the suitability of stones against   the grinding action under traffic. Any 1 of the following test can be conducted to find out the suitability of aggregates:

A.   Los Angeles abrasion test

B.   Deval abrasion test

C.   Dorry's abrasion test.

Los Angeles abrasion test is preferred as these test results are with good correlation with the performance of the pavements.

The Los Angeles apparatus consists of a hollow cylinder 0.7 m inside diameter and 0.5 m long having both ends closed. It is mounted on a frame so that it may be rotated about horizontal axis. IS code has standardized the test process for different gradation of specimen. With specified weight of specimen a specified number of cast iron balls of 48 mm diameter are placed in the cylinder.

914_los angeles testing machine.png

           Los Angeles testing machine

Then the cylinder is rotated at a speed of 30 to 33 rpm for particular number of times (500 to 1000). Then the aggregate is removed & sieved on 1.7 mm. IS sieve. The weight of aggregate passing is found. Then Los Angeles value is calculated as

1986_los angeles testing machine1.png

The following values are recommended for road works:

For bituminous mixes = 30%

For base course = 50%

Posted Date: 10/16/2012 2:04:38 AM | Location : United States







Related Discussions:- Abrasion test - tests on stones, Assignment Help, Ask Question on Abrasion test - tests on stones, Get Answer, Expert's Help, Abrasion test - tests on stones Discussions

Write discussion on Abrasion test - tests on stones
Your posts are moderated
Related Questions

Define Inspection of Steel or Cast Iron Substructures? Corrosion is the principal cause of deterioration in steel waterfront substructures. On bare un-protected steel pilings,

how can i prepare a project on dam

Q. Show the Settlement due to Vibration? The foundation resting on cohesionless soil and subjected to vibrations will result in settlements of higher magnitude. In sandy soil

what is the atomic polarisibility of argon its susceptibility is 273k and 1 atm is 4.35*10^-4 and n is 2.7*10^25atoms/m^3

Q. Show the Specification of Bricks? Specification of Ist class Bricks- 1. Table moulded and wire cut. 2. It should have edges and parallel faces. 3. If struck with ha

Q. What is Rapid Sand Filter? A Rapid Sand Filter is a water treatment plant that includes provision for pre treating the water by coagulation and sedimentation for settlement

Question What are major considerations in selecting marine plants and land plants for fitting of band drains? Answer For fitting of band drains by marine plants,

#questidisadvantage of steelon..

What are the conditions essential for Darcy's law to be applicable for flow of water by soil ? Why is the permeability of a clay soil with flocculated structure greater than tha