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 black and white fathometer - non-destructive testing, Define Black &...

Define Black & White Fathometer - Non-Destructive Testing? Most commonly used sounding device is black & white fathometer. The units are compact and easy to use. They consist o

Explain transpiration and infiltration, Explain Transpiration and Infiltrat...

Explain Transpiration and Infiltration Transpiration: The part of evaporation in which water vapor enters the atmosphere through the plants. The "transpired" water originated

Discuss about the post-tensioning systems, Discuss about the post-tensionin...

Discuss about the post-tensioning systems In most of post-tensioning systems, when the cable is tensioned and the jack is released to transfer prestress to concrete, the fricti

Continuous beam reaction by equilibrium equation, Solve problem of continu...

Solve problem of continuous beam with equilibrium equation

Distance between concrete columns in 5 story building, distance between con...

distance between concrete columns in 5 story building and if there is distance 15 feet than what should be the column size and how many bars and diameter of each bar ?

Doors and windows, important considerations in case doors and windows

important considerations in case doors and windows

Define the planning an underwater inspection, Define the Planning an Underw...

Define the Planning an Underwater Inspection? Planning for underwater inspection is important because of - Unknown factors which may be discovered during the diving - Th

TORSION, WHAT IS TRANSVERSE AND LONGITUDINAL REINFORCEMENT?

WHAT IS TRANSVERSE AND LONGITUDINAL REINFORCEMENT?

Granite tiles for construction material, Q. Granite Tiles for construction ...

Q. Granite Tiles for construction material? At every important station for public urinals granite may be used as wall cladding drain and foot rest material. The water sinks at

Survey 1, describe how you would range a surveying line betwen two point wi...

describe how you would range a surveying line betwen two point wich are not entervisible?

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