Abrasion test - tests on stones, Civil Engineering

Assignment Help:

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%


Related Discussions:- Abrasion test - tests on stones

Constraction, sir what is means by share force

sir what is means by share force

Closing and opening of expansion joints and contraction join, Question ...

Question In case of for unreinforced concrete carriageway, what will succession of closing and opening of expansion joints and contraction joints? Answer Take a case t

Plinth wall, is it necessary for to put plinth wall in buildings

is it necessary for to put plinth wall in buildings

Show afflux and scour in alluvial rivers, Q. Show Afflux and scour in alluv...

Q. Show Afflux and scour in alluvial rivers? In case of alluvial rivers, the river bed comprises scourable material like sand. Constriction of bridge waterway causes increase

#soil survey., Explian obstacles in chaining but not ranging.

Explian obstacles in chaining but not ranging.

Execution compression test for concrete, Question In execution compression...

Question In execution compression test for concrete , have to test cubes .Test cylinders be approved? Answer Essentially, results of compression test carried out by using cu

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd