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

Define in biref about the final prestress, Define in biref about the Final ...

Define in biref about the Final Prestress The stress which exists after all losses of prestress have occurred substantially is known as final prestress. This may be calculated

Construction of the building, a) Certain data for the materials used in the...

a) Certain data for the materials used in the construction of the building, e,g, insulation, building materials, air spaces, etc.  b)  Draw, with appropriate dimensions, the cro

Management of engineering stores general, Charged of stores - The follo...

Charged of stores - The following types of stores come under this category: - i. Consumable stores, such as kerosene oil, paints, varnishes, cotton waste and grease, etc, is

Explain the term -tendon splices, Tendon splices Tendon splices are us...

Tendon splices Tendon splices are used to join tendons when continuous prestressed concrete , members require long tendons to achieve continuity. Several types of tendon splic

For the plane area shown determine the first moments, for the plane area sh...

for the plane area shown determine the first moments with respects to the x & y axis & the location of the centroid

Define scour - underwater inspection of bridges, Define Scour - Underwater ...

Define Scour - Underwater Inspection of Bridges? Whenever a bridge crosses a waterway, even a small or intermittent one, scour is a dangerous effect that can damage bridge pier

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