Write short notes on abrasion test, Civil Engineering

Assignment Help:

Q. Write short notes on Abrasion Test?

The abrasion test for ballast shall be carried out using Los-Angeles machine.The abrasive charge shall consist of 12 nos. cast iron or steel spheres approx. 48mm dia and each weighing between 390 and 445 gm ensuring total weight of charge as 5,000 ± 25 gm.

The test sample of 10000gm shall consist of clean ballast conforming to the following grading :- Passing 50mm and retained on 40 mm square mesh sieve 5,000 gm and Passing 40 mm and retained on 25mm square mesh sieve 5,000 gm tolerance of ± 2% permitted.

The sample shall be dried in oven at 100 - 110 °C to a constant weight and weighed (Weight 'A')

The test sample and the abrasive charge shall be placed in the Los-Angeles abrasion testing machine and the machine rotated at a speed of 20 - 33 revolutions/minute for 1000 revolutions. At the completion of test, the material shall be discharged and sieved through 1.70mm IS sieve.

The material coarser than 1.70 mm IS sieve shall be washed, dried in oven at 100-110°C to a constant weight and weighed (weight B).

The proportion of loss between Weight "A" and Weight "B" of the test sample shall be expressed as a percentage of the original weight of the test sample. This value shall be reported as: Aggregate Abrasion Value =((A-B)/A)X100.


Related Discussions:- Write short notes on abrasion test

Cross drainage work, Cross Drainage Work: Several natural streams, ri...

Cross Drainage Work: Several natural streams, rivers and canals cross the road. They have to be led across the road through culverts and bridges. That given structures is kno

Fluid mechanics, Cd of venturimeter is more than that of orificemeter

Cd of venturimeter is more than that of orificemeter

Parallel pipe systems or multipath pipeline problems, Parallel Pipe Systems...

Parallel Pipe Systems or Multipath Pipeline Problems Two or more sections of piping (branches) of different diameters, lengths and/or pipe materials originating and terminating

Staircase, The Figure 1 below shows a section through a stairway for a gara...

The Figure 1 below shows a section through a stairway for a garage in a new proposed dwelling. The stairway is 3 meters wide with 300 mm wide treads(7 treads) and 170 mm high riser

Main advantages of using rubber dams, Question In assortment of dams in...

Question In assortment of dams in drainage channels, what are the main advantages of using rubber dams instead of steel-gate dams ? Answer Key Advantages of rubber d

Low cost roads connecting villages, Low Cost Roads Connecting Villages: ...

Low Cost Roads Connecting Villages: Problem of Village Connectivity It is estimated that nearly 45 per cent of India's villages are not connected by an all-weather ro

Laplace transform, Using Laplace transfom, the following differential equat...

Using Laplace transfom, the following differential equation d y dy dt reduces to the algebraic equation of the form Resolve y(s) into partial fractions

Determine the basic concepts of prestressing, Determine the Basic Concepts...

Determine the Basic Concepts  of Prestressing In the year 1904, Freyssinet tried to introduce prestresses in concrete to resist stresses developed due to external loads. Later,

Calculate the ultimate compressive strength, Calculate the ultimate compres...

Calculate the ultimate compressive strength A 6 in. by 12 in. cylinder failed at an axial compressive force of 120,000-lbf, at 28 days. Calculate the ultimate compressive stren

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