Difference Between Fine and Coarse Aggregate

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Aggregates are essential components of concrete. They act as inert material in concrete. Fine and coarse aggregate are two main types of aggregate for concrete. As the name indicates, they are basically classified depending on the sizes of aggregate particles.

Difference Between Fine and Coarse Aggregate

What is an Aggregate?

Aggregates are the important constituents of the concrete which give body to the concrete and also reduce shrinkage. Aggregates occupy 70 to 80 % of the total volume of concrete. So, we can say that one should know definitely about the aggregates in-depth to study more about concrete.

(Also Read: Advantages and Disadvantages of R.C.C)

What is Fine Aggregate??

When the aggregate is sieved through a 4.75 mm sieve, the aggregate passed through it called as fine aggregate. Natural sand is generally used as fine aggregate, silt and clay have also come under this category.

What is Coarse Aggregate??

When the aggregate is sieved through a 4.75 mm sieve, the aggregate retained is called coarse aggregate. Gravel, cobble and boulders come under this category. The maximum size aggregate used may be dependent upon some conditions. In general, 40 mm size aggregate used for normal strengths and 20mm size is used for high strength concrete. 

(Also Read: Quantity Analysis for Materials In 100 sq.m Cement Plaster)

Difference Between Fine and Coarse Aggregate

Fine and coarse aggregate have some major differences. Sources of main differences between deep and shallow footings are definition, size of particles, materials, sources, surface area, function in concrete, uses, etc.
In the following table the main differences between Fine and coarse aggregate are given:

Sl NoScopesFine Aggregate (FA)Coarse Aggregate (CA)
1DefinitionFine aggregates are small size filler materials in construction.Coarse aggregates are larger size filler materials in construction.
2Size of ParticlesFine aggregates are the particles that pass through a 4.75 mm sieve and retain on a 0.075 mm sieve.Coarse aggregates are the particles that retain on a 4.75 mm sieve.
3MaterialsSand, surki, stone screenings, burnt clays, cinders, fly ash, etc are used as fine aggregate in concrete.Brick chips (broken bricks), stone chips (broken stones), gravels, pebbles, clinkers, cinders etc. are used as coarse aggregate in concrete.
4SourcesRiver sand or machine sand, crushed stone sand, crushed gravel sand are the major sources of fine aggregate.Dolomite aggregates, crushed gravel or stone, natural disintegration of rock are the major sources of coarse aggregate.
5Surface AreaThe surface area of fine aggregates is higher.The surface area of coarse aggregate is less than fine aggregates.
6Function in ConcreteThe voids between the coarse aggregate are filled up by fine aggregate.Coarse aggregate acts as inert filler material for concrete.
7UsesFine aggregates are used in mortar, plaster, concrete, filling of road pavement layers, etc.Coarse aggregates are mainly used in concrete, railway track ballast, etc.

(Also Read: Instruments Used to Measure Rainfall and Snowfall)

I have already started an AutoCAD 2D, 3D and Iso-Metric Video Tutorial in our YouTube Channel, Civil Engineering Notes. If you want to learn AutoCAD, Please visit our YouTube Channel.

I hope this article will help you to know the difference between the fine and coarse aggregate. You may also want to see my other post from my Blog.  If I have missed anything here, please let me know about that in the comment below this post.

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