Size Of Aggregate Used In RCC, PCC, Slab, Road, Bridge And Dams
All types of aggregate made of crushed of igneous rock granite rock sedimentary rock and Metamorphic rock, all type of aggregate unit in different purpose for building construction pavement, roads, Street and building and interior and exterior designing of house.
Some of these you will be familiar with that is fine aggregate and coarse aggregate containing different size and name like crushed stone, coarse sand, medium sand, fine sand ,silt ,clay and fine gravel ,medium gravel ,coarse gravel, pebbles cobbles and boulders.
When the aggregate is sieved through 4.75 mm size the aggregate is retained is known as coarse aggregate. Larger than 4.75mm size is coarse sand or aggregate, so coarse aggregate size arranging between 5mm to 256 mm or more.
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Types of coarse aggregate and their size
1) fine gravel -4 to 8 mm
2) medium gravel- 8 to 16 mm
3) coarse gravel -16 to 64 mm
4) pebbles -4 to 64 mm
5) cobbles -64 to 256 mm
6) boulder – more than 256 mm
Size of aggregate used in construction
Size of aggregate used in construction:- it all depend on structure, whether it is plain cement concrete or reinforced cement concrete. Most commonly used aggregate size in construction is 20mm, 40mm and 75mm. Aggregate size 20mm used in RCC structure, 40mm aggregate size used in PCC structure or mass concreting and 75 mm and more size used in retaining wall construction.
Size of aggregate used in PCC
Size of aggregate used in PCC:- PCC is plain cement concrete made of mixture of cement, sand, aggregate and water without providing Steel, typically most common size of aggregate used in PCC is 40mm. This is best, perfect, ideal and standard size of aggregate used in PCC like construction of PCC pavement, road, walkway or driveway.
Why 40mm size aggregate is preferred in PCC or mass concrete than 20mm :-
For the same strength or workability, concrete with large size aggregate will require lesser quantity of cement than concrete with a smaller size aggregate. In a mass concrete work or PCC the use of larger size aggregate will be useful due to the lesser consumption of cement, this will also reduce the heat of hydration and the corresponding thermal stresses and shrinkage cracks.
But in practice the size of aggregate cannot be increased to any limit on account of the limitation in the mixing, handling and placing equipment.
In large size aggregates surface area to be wetted per unit weight is less, and the water cement ratio is less which increases the strength. On the other hand in smaller size aggregates the surface area is increased which increases w/c ratio and lower strength is achieved.
In general for strength up to 200 kg/cm2 aggregates up to 40 mm may be used and for strength above 300 kg/cm2 aggregate up to 20 mm may be used.
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Size of aggregate used in RCC
Size of aggregate used in RCC:- RCC is reinforced cement concrete made of mixture of cement, sand, aggregate and water provided with steel bar. Typically most common size of aggregate used in RCC structure like roof slab, column, beam and bridge deck is 20mm. This is best, perfect, ideal and standard size of aggregate used in RCC for construction of roof slab, column and beam.
Maximum size of coarse aggregate used in RCC
Maximum size of coarse aggregate used in RCC:- generally, 18mm, 20mm and 25 mm size of aggregate used in RCC work. 18mm is minimum size, 20mm is most common size used and maximum size of coarse aggregate used in RCC is 25mm.
Size of aggregate used in road construction
Size of aggregate used in road construction:- Road construction needs mass concreting work, where there is no limitation for concrete flow, most common size of aggregate used in road construction is 40mm. This is best, perfect, ideal, standard and maximum size of aggregate used in Road construction of pavement, walkway, driveway and etc.
Size of aggregate used for retaining wall
Size of aggregate used in retaining wall:- Retaining walls are relatively rigid walls used for supporting soil laterally so that it can be retained at different levels on the two sides. most common size of aggregate used for retaining wall construction is 75mm. This is best, perfect, ideal, standard and maximum size of aggregate used for retaining wall construction.
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Size of aggregate used in Bridge construction
Size of aggregate used in Bridge construction:- Bridge slab and their deck construction provided with reinforcement need mass concreting work, where there is no limitation for concrete floor. Most common size of aggregate used in bridge slab and their deck construction is 40 mm. This is best, perfect, ideal, standard and maximum size of aggregate used in bridge construction.
Size of aggregate used in concrete Dams
Size of aggregate used in concrete Dams:- dam is heavily concrete, require a lot of mass concreting work, in Concrete Dams – 75mm aggregate size provided near the face where there steel reinforcement provided and 150 – 200mm maximum size of aggregate provided in the rest of the dam. Here concrete is poured by cranes from concrete buckets.
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