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
Explain Information Processing and Perception - Driver Performance The time required to respond successfully to any driving situation, such as an emergency, involves four stage

WHAT ARE THE DIFFERENT TYPES OF BRIDGES

Explain economical span if bridges


Define Limitations of Underwater Magnetic Particle Testing? As with any non-destructive test method, UWMT has some limitations as under: i. Underwater magnetic particle tes

Define Inspection of Pier or Abutment? Inspection of pier/abutment may then be carried out as under: i. Conduct visual inspection of the entire surface using up and down swe

Cross-sectional Elements: The terms used in the cross-section of a road are : Carriageway The portion where traffic moves. Shoulder The portion outside the ca

Define the Coefficient of Permeability: (K) A measurement of the ability of the soil or an aquifer for the movement of water through it. Also termed "hydraulic conductivity", C

Define the Influence line-beam shear?   1.  Replace point of interest with a link element of nominal length.  If the point of interest is a reaction, place a hinge at that poin

types of door with sketches