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

Necessity of air voids in bituminous pavement, Q. Necessity of air voids in...

Q. Necessity of air voids in bituminous pavement? If the presence of air voids is too high, it results in an increase of permeability of bituminous pavement. This enables the f

Scour, Q. What do you mean by Scour? Whenever a bridge crosses a waterw...

Q. What do you mean by Scour? Whenever a bridge crosses a waterway, even a small or intermittent one, scour is a dangerous effect that can damage bridge piers and undermine fou

What is meaning of maintenance period, Question If contractor is likely...

Question If contractor is likely for defective works for 12 years with pact under seal, then what is meaning of Maintenance Period? Answer Faulty works constitute a br

Explain the bearing capacity failure, A continuous wall footing, 1 m wide,...

A continuous wall footing, 1 m wide, rests on sand, the water table lying at a great depth. The corrected N-value for the sand is 10. Verify the load which the footing can support

Explain equations for a triangular (v-notch weir), Explain Equations for a ...

Explain Equations for a triangular (V-notch weir) Used for small flow rates. C 2 is a coefficient which varies from 0.58 to 0.61 depending upon the notch angle.  Q = C

What do you mean by stock verification sheets, Q. What do you mean by Stock...

Q. What do you mean by Stock Verification Sheets? The proper custody and accountal of stores is the prime duty and function of an executive or the stockholder. To ensure this v

Concrete technology, Sir, What is the dosage limit of densifier for SF...

Sir, What is the dosage limit of densifier for SFRC concrete

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