Aggregates paly important role in construction. But highly important in payment construction. Aggregates influences to great extend to load transfer in pavement.
Aggregates should be hard, tough durable, free from impurities.
There are lab Test on Aggregates on aggregates. There are so many tests are there to test aggregates against, hardness, fineness, strength, shape & size, impact, wear and tear etc.
Some of the important tests are listed below,

Test on Aggregates:

1. Sieve Analysis/ Grading of aggregates

The Sieve analysis test on aggregate is nothing but the gradation test, in which gradation of particle (distribution of aggregates by size, within given sample) is find out.
1. The gradation is also required to find out suitability of aggregates for construction, its strength and durability. To read more click here>>>Fineness modulus of Fine Aggregates: Fineness modulus of sand is a index number, which represent the mean size of particle in sand. Fineness modulus is found by performing the sieve analysis. Click here to know more>>>
1. Fineness modulus of Coarse Aggregates: Fineness modulus of coarse aggregate is a index number, which represent the mean size of particle in coarse aggregates. Click here to know more>>>

Aggregate impact is test on aggregate defined as the ability of aggregates to have resistance against shock and impact, toughness.
It Also can be defined as the load at which aggregates start cracking due to the impact and shocking.
In aggregate impact value test, the aggregates are tested to find out toughness of aggregate to absorb shock and impact.
Impact and shock can break the aggregates and it can leads to pavement failure.
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The shape test on aggregates determines the shape and size od particle.
Size & shape of aggregates directly has impact on strength of concrete, bond strength, workability of concrete, cement requirement and cost required for concrete.
Rounded, elongated and flaky aggregates offer good workability but less bond strength and mechanical strength.
Angular & irregular aggregates offers lesser workability but good bond strength and mechanical strength.
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The Crushing test itest on aggregate to test crushing strength of pavement materials.
The crushing test of aggregate is used to determine the resistance to crushing under gradually applied load.
This test is performed on aggregates used for road works.
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Abrasion test on aggregate is carried out to find out hardness of aggregates. And it is mostly used when aggregates used to be in road construction.

Abrasion test is carried out with help of Los Angeles machine and that’s why it can be also called Los Angeles Abrasion test.
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Soundness test on aggregate is to determine the resistance of aggregates for weathering action like variation of temperature, rain, throws etc.
The porous and less density aggregates are more prone to freezing and throwing action also the disintegration is quick and premature.
Using such aggregates in road construction is not only degrade the road quality but can cause accidents and poor-quality road work.
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Specific gravity and water absorption of aggregates are test on aggregate and most important properties of aggregates which needs to be considered while designing concrete and roads.
Specific gravity is important to find out quantity, quality and toughness of aggregates
Water absorption is important to know percentage of water absorption, porousness of aggregates.
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Normally bitumen adheres to aggregates when aggregates are free from dust, debris, foreign particles and moisture.
In absence of water, bitumen performs well adheres to aggregates. But in presence of water the adhesion with bitumen and aggregates start to decrease. Water decreases the bond between aggregates and bitumen. This is why water is called Enemy of road construction.
Adhesion is difficult when aggregates are wet and cold. So precautionary measures need to be taken to remove moisture from aggregates. Also water causes stripling of binder from coated aggregates.
Bitumen test on aggregate Click here to know more>>>

Tests for Aggregates with IS codes
Property of Aggregate	Type of Test	Test Method
Crushing strength	Crushing test	IS : 2386 (part 4)
Hardness	Los Angeles abrasion test	IS : 2386 (Part 5)
Toughness	Aggregate impact test	IS : 2386 (Part 4)
Durability	Soundness test	IS : 2386 (Part 5)
Shape factors	Shape test	IS : 2386 (Part 1)
Specific gravity and porosity	Specific gravity test and water absorption test	IS : 2386 (Part 3)
Adhesion to bitumen	Stripping value of aggregate	IS : 6241-1971