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

Surveying, how prepared for surveying?

how prepared for surveying?

Compass surveying, Compass Surveying: You have studied about the compa...

Compass Surveying: You have studied about the compass and its use for bearings of measuring survey lines. The angular measurements are carried out with prismatic compass that

Define underwater magnetic particle testing, Define Underwater Magnetic Par...

Define Underwater Magnetic Particle Testing? Underwater magnetic particle testing (UWMT) is a non-destructive testing suited for detection of surface cracks or discontinuities

Chain surveying, describe setting out right angle at given point on a chain...

describe setting out right angle at given point on a chain line and when the point lies outside the chain line

Solid mensuration, If the diameter of the base remains constant, by what fa...

If the diameter of the base remains constant, by what factor should the altitude be multiplied to produce a cone with twice volume as the original

How to calculate the dry density and void ratio, A moist soil sample compac...

A moist soil sample compacted into a mould of 1000 cm 3 capacity and weight 35 N, weighs 53.5 N with the mould. A representative sample of soil taken from it has an initial weight

Projects, GIS AND REMOTE SENSING

GIS AND REMOTE SENSING

Numericals on settlement of foundation, A footing foundation for a water to...

A footing foundation for a water tower carries a load of 9000 kN and is 3.6 metres square. It rests on dense sand of 9 m thickness overlying a clay layer of 3 metres depth. The cla

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