In this lecture we will find that '
What is the aggregate crushing value of coarse aggregate ?
Aggregate crushing value test kaise kiya jata hai ?
How is the aggregate crushing value test conducted?
what is the procedure of Aggregate Crushing value test?
How to Conduct aggregate Crushing Value test?
What is the crushing value of coarse aggregate as per IS 383?
What are the IS Specifications for aggregate crushing value?
What will be the maximum aggregate crushing value when determined in accordance with IS 2386 part 4 for the aggregate to be used in concrete for spillway?
What will be the maximum aggregate crushing value when determined in accordance with IS 2386 part 4 for the aggregate to be used in concrete for highway, roadway, tunnel carrying water?
what are the steps for aggregate crushing value test?
IS 383 k according Aggregate crushing value kitni hona chahiye?
In this lecture we will also discuss that
How to fill test report of aggregate crushing value test?
Aggregate crushing value k liye test report kaise fill karte hai?
Aggregate Crushing Value Test as per IS 2386 part 4 | Highway & Transportation Engineering Laboratory Experiment
test in Site laboratory.
Concept and Specifications of Aggregate crushing value test--
The aggregate crushing value test gives a relative measure of the resistance of an aggregate to crushing under a gradually applied compressive load. Aggregate crushing value is defined as the percentage by weight of the crushed (or finer) material obtained when the test aggregates are subjected to a specified load under standardized conditions, and the strength of the aggregate used in road construction is expressed by numerical index.
Aggregates with lower crushing value show a lower crushed fraction under load and would give a longer service life to the road and hence a more economical performance. If we used a weaker would get crushed under traffic loads, would produce smaller pieces not coated with a binder, and these would be easily displaced or loosened out resulting in loss of the surface/layer. Due to this reason, the aggregates used in road and bridge construction must be strong enough to withstand crushing under roller and traffic.
Objectives of Crushing Test
1. To determine the crushing value of aggregate for road aggregates;
2. To determine the suitability of aggregates for use in different types of road pavements.
Procedure
The aggregate sample: The material for the standard test consists of aggregates sized 10.0 mm to 12.5 mm. The aggregates must be in a surface dry condition before testing. The aggregates may be dried by heating at 100 oC - 110 o C for not more than 4 hours and cooled to room temperature before testing, if required.
Sieve the material through 12.5 mm and 10 mm IS sieves.
Aggregates should be poured to fill about just more than 1/3 rd depth of the measuring cylinder.
The material is compacted by giving 25 gentle blows with the rounded end of the tamping rod.
Two more layers are added in a similar manner, such that the cylinder is full.
Remove the excess material with a straight edge. Now, this amount of quantity contained in the measuring cylinder is the amount of aggregates that will be used to prepare the test specimen.
Empty the cylinder and weight the aggregates, accurate up to 1 gm.
Transfer the whole of this weighted quantity to the test mould by filling it in three layers in the same manner as for cylindrical measure. The total depth of the sample is then about 10 cms and the surface a little below the top of mould.
The surface is leveled and place the plunger over it so that it rests horizontally on the surface of the aggregates.
Then place this assembly on the pedestal of the compression testing machine.
The load is applied at a uniform rate of 4 tones per minute.
Release the load
Take the aggregate out of the cylinder and sieve them through a 2.36 mm IS sieve. Weight this fraction passing through it to an accuracy of 0.1 gm. The mean of two observations, rounded to the nearest whole number is reported as the “Aggregate crushing Value”.
Limits of aggregate crushing value for
Surface or Wearing course-30
Lecture-8 :- Aggregate Impact Value Test
Link:- • Aggregate Impact Value...
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#concrete #concretecube #sieve #sievingAggregate Crushing Value Test | Transportation Engineering Laboratory Experiment
test in Site Laboratory
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