This video shows how to conduct Abrasion Test on Road Aggregates by Los Angeles Abrasion Testing Machine, abrasion values for different types of pavements is also given in the video
Due to the movements of traffic, the road stones used in the surfacing course are subjected to wearing action at the top. Resistance to wear or hardness is hence an essential property for road aggregates, especially when used in wearing course. Thus road stone should be hard enough to resist the abrasion due to the traffic. When fast moving traffic fitted with pneumatic tyres move on the road, the soil particles present between the wheel and the road surface causes abrasion on the road stone. Hence in order to test the suitability of road stones to resist the abrading action due to traffic, tests are carried out in the laboratory.
Abrasion test on aggregates are generally carried out by any one of the following methods.
1) Los Angeles abrasion Test
2) Deval Abrasion test
3) Dorry abrasion test
Of these tests, Los Angeles Abrasion Test is more commonly adopted as the test values of aggregates have been correlated with performance of studies. The IS Standards has suggested that wherever possible, Los Angeles Test Should Be Preferred.
APPARATUS REQUIRED are as follows.
1) Los Angeles abrasion Test
2) Weighing scale
3) IS Sieve 1.7 mm
4) Course aggregates
PROCEDURE:
1) Take Clean and dry aggregates weighing 5 Kgs is taken as test specimen and placed in the cylinder
2) The cover is then fixed dust tight.
3) The machine is rotated at a speed of 30 to 33 revolutions per minute. And rotated for 500 revolutions. The machine should be balanced and driven in such a way as to maintain uniform peripheral speed.
4) After the desired number of revolutions, the machine is stopped and the material is discharged from the machine taking care to take out entirestone dust.
5) Using a sieve of size larger than 1.7 mm the material is first separated into two parts and the finer is taken out and sieved further on a 1.7 mm sieve
6) The portion of material coarser than 1.7mm size is weighed correct to one gram.
I Sincerely thank my students Mohammed Sameer, Manjunath Pujari and Guruprasad Gondi for their assistance.
Big thanks to my Institution KLS Shri Vasantrao Potdar Polytechnic for permitting to carry out this experiment
#abrasiontestonaggregates #losangelesabrasiontestingmachine #abrasion