What is an aggregate in concrete?
Aggregates are generally thought of as inert filler within a concrete mix. ... Using larger coarse aggregate typically lowers the cost of a concrete mix by reducing cement requirements, the most costly ingredient.
Why aggregate is used in concrete?
It is the stuff that the cement paste coats and binds together. ... The composition, shape, and size of the aggregate all have significant impact on the workability, durability, strength, weight, and shrinkage of the concrete.
Is concrete stronger with aggregate?
The aggregate strength is usually not a factor except in lightweight and high strength concrete. However, aggregate characteristics other than strength, such as the size, shape, surface texture, grading and mineralogy are known to affect concrete strength in varying degrees.
What is 20mm aggregate?
for example a graded aggregate of nominal size 20 mm means an aggregate most of which passes 20 mm IS sieve. A coarse aggregate which has the sizes of particles mainly belonging to a single sieve size is known as single size aggregate.
What is 10mm aggregate?
10mm Recycled Aggregate is comprised of deposits of mainly, brick, rock, tiles and demolition concrete, that are crushed and screened to a nominal size of 10mm. It is known as a minimal fines product as the screening process separates most of the fine residue from the aggregate.
What is the weight of 20mm aggregate?
Density of 20mm and 40mm aggregate ranging between 1450 kg/m3 to 1550 kg/m3, consider density of 20mm aggregate is equal to 1550 kg/m3, it means weight of 1 cubic metre of 20 mm size aggregate is equal to 1550 kg.
What size is type 2 aggregate?
Type 2. Like Type 1, this is crushed stone but less than 40mm in size down to dust and with no specified grading. It contains finer material than type 1 and is used as granular sub base.
What is the minimum size of aggregate?
A maximum size up to 40 mm is used for coarse aggregate in most structural applications, while for mass concreting purposes such as dams, sizes up to 150 mm may be used. Fine aggregates, on the other hand, have particles up to a minimum size of 0.
What size is #57 aggregate?
What size crushed stone for concrete slab?
Question: What size aggregate should be used to make the concrete for a 4 inch slab? Top Answer (37% of 40 votes): 3/4 inch crushed stone. Explanation: #57 rock (3/4) is best for strength.
Do you put gravel under concrete slab?
Because concrete is a very porous material, it will absorb any moisture that it contacts. This can cause pooling. Without crushed stone, pooling water will settle under it and erode your slab. Adding a layer of crushed stone will add proper drainage, as well as create a barrier between your slab and the ground.
Do you need sand under concrete?
Pour concrete over a solid, well-drained base of sand or gravel over clay and other poorly draining soils to provide even support.
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