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

Determine the crash rate - transportation, A five-mile long section of two-...

A five-mile long section of two-lane road has an AADT of 8,000.  There have been six crashes on this section of road during the past two years.  What is the crash rate? R sec

Stop dead restriction, With a clear sketch indicate the system of protectio...

With a clear sketch indicate the system of protection of line for works of short duration where ‘ Stop dead restriction' need to be observed on a single line section on a BG track.

Transportatoin engineening, explain the construction while aligning roads o...

explain the construction while aligning roads on hilly areas

Explain the selected bridges - underwater inspection, Explain the Selected ...

Explain the Selected Bridges - Underwater Inspection? Those bridges, which require underwater inspection must be noted for individual inspection and inventory records as well b

Bituminous courses, Bituminous Courses Types of Bituminous Courses ...

Bituminous Courses Types of Bituminous Courses The following are the various bituminous course commonly used : (a) Prime Coat (b) Tack Coat (c) Surface Dress

Define the cracking - underwater inspection of bridge, Define the Cracking ...

Define the Cracking - underwater inspection of bridge? A crack is a linear fracture in concrete. There can be several types of cracks starting from surface and going into the c

Role of rebate in typical construction joint, Question What is role of reba...

Question What is role of rebate in typical construction joint ? Answer Construction joints are formed on sites to facilitate construction procedure. Though, if improperly constr

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