What are the 4 main types of aggregates?
James Olson
Updated on February 22, 2026
The four primary aggregates are sand, gravel, crushed stone, and recycled concrete or fill. These different materials work to hold the ingredients together to harden into various landscaping projects such as sidewalks, driveways, roads, and parking lots. Let’s examine each aggregate in detail and its uses.
What is the particle size of fine aggregate?
Fine aggregates, on the other hand, have particles up to a minimum size of 0.075 mm. Typical particle size analyses of coarse and fine aggregates are shown in Figure 1. The grading of the aggregate can be distinguished based on the sieve analysis.
What is the ideal aggregate particle size for a concrete mix?
Typically the most common size of aggregate used in construction is 20mm. A larger size, 40mm, is more common in mass concrete. Larger aggregate diameters reduce the quantity of cement and water needed.
What is rounded aggregate?
Rounded – Natural aggregates smoothed by weathering, erosion and attrition. Rocks, stone, sand and gravel found in riverbeds are your most common rounded aggregates. Rounded aggregates are the main factor behind workability.
What are types of aggregates?
The Different Types Of Aggregate. The categories of aggregates include gravel, sand, recycled concrete, slag, topsoil, ballast, Type 1 MOT, and geosynthetic aggregates (synthetic products commonly used in civil engineering projects used to stabilise terrain).
Is sieve No 15?
sieve No. 480 [4.75mm] is considered as coarse aggregate….Coarse aggregate.
| Size | Use |
|---|---|
| 15 to 20mm | R.C.C. works |
| 10 to 12mm | Thin R.C.C. section, curtain walls |
IS 383 for coarse aggregate?
1.1 This standard covers the requirements for aggregates, crushed or uncrushed, derived from natural sources, such as river terraces and river- beds, glacial deposits, rocks, boulders and gravels, for use in the Production of concrete for normal structural purposes including mass concrete works.
Can crushed concrete be used as aggregate?
For the purpose of this article the term crushed concrete aggregate (CCA) is defined as returned concrete and recycled concrete aggregate clean enough to be used as aggregate for new concrete. Recycled concrete aggregate (RCA) refers to crushed concrete and other materials suitable for use as fill and compactible fill.
Does pea gravel make concrete stronger?
In general, angular crushed particles give concrete greater strength because they interlock more than rounded pea gravel particles do. Size also influences strength: The bigger the aggregate, the stronger the finished concrete will be, since the chunks of rock don’t crack as cement paste does.
What are angular aggregates?
The angular aggregates consist well defined edges formed at the intersection of roughly planar surfaces and these are obtained by crushing the rocks. Angular aggregates result maximum percentage of voids (38-45%) hence gives less workability.
What is Class A aggregate?
(a) Class A aggregate for mineral aggregate base and surface courses shall consist of hard durable particles or fragments of stone, slag, gravel, or chert, and other finely divided mineral matter.
How do you determine the size of aggregate particles?
The aggregate particle size is determined by using wire-mesh sieves with square openings. The seven standard ASTM C 33 (AASHTO M 6/M 80) sieves for fine aggregate have openings ranging from 150 µm to 9.5 mm (No. 100 sieve to 3 8 in.). The 13 standard sieves for coarse aggregate have openings ranging from 1.18 mm to 100 mm (0.046 in. to 4 in.).
What is the particle size of gravel?
In the mining industry, the particle size of gravel is usually between 5mm-31.5mm, and 1-2 / 1-3 gravels are generally collectively referred to as paving gravels. The specific sizes of gravel are as follows:
How does the shape of aggregate particles affect the workability?
The shape of aggregate particles can affect water demand and workability, mobility, bleeding, finishability and strength. Equidimensional shapes are preferred. Flaky or elongated particles tend to be detrimental. Rounded particles tend to give better workability than crushed or angular particles.
What is the durability of aggregate particles?
The durability of aggregate particles is defined as their resistance to the accumulative effects of environmental and cyclical load conditions. Aggregate durability is affected by temperature, load, moisture conditions, chemical exposure, freezing, and thawing.
