What are the classifications of aggregates?

Aggregates are classified according to shape into the following types
  • Rounded aggregates.
  • Irregular or partly rounded aggregates.
  • Angular aggregates.
  • Flaky aggregates.
  • Elongated aggregates.
  • Flaky and elongated aggregates.

What are the 3 aggregates of concrete?

Concrete aggregates are composed of geological materials such as gravel, sand and crushed rock. The size of the particles determines whether it is a coarse aggregate (e.g. gravel) or a fine aggregate (e.g. sand).

What are two classifications of aggregates in a concrete mix?

The variability in density can be used to produce concrete of widely different unit weights, see Table (1). The most common classification of aggregates on the basis of bulk specific gravity is lightweight, normal-weight, and heavyweight aggregates.

What are the 2 types of aggregates?

Fine aggregate usually consists of sand, crushed stone, or crushed slag screenings; coarse aggregate consists of gravel (pebbles), fragments of broken stone, slag, and other coarse substances.

What are the 4 main types of aggregates?

Aggregates Definition:

It includes gravel, crushed rock, sand, recycled concrete, slag, and synthetic aggregate.

What are the 4 types of concrete?

Let’s take a quick look at the most common types of concrete and what they are used for:
  • Reinforced Concrete.
  • Lightweight Concrete.
  • High-Strength Concrete.
  • High-Performance Concrete.
  • Precast Concrete.

What is Type 3 aggregate?

In very general terms, Type 3 is an open graded crushed aggregate roughly in the range 40mm to dust. Unlike the two most popular Close Graded Aggregates (CGAs), Type 3 is a low-fines aggregate and not no-fines, as some sources seem to believe.

Which aggregate is used in RCC?

nikeetasharma. Generally the most appropriate size of aggregate used in RCC structure is 20mm. It gives more strength to the structure.

What are properties of aggregate?

Basic properties of aggregates include mineralogical composition, surface texture and grain shape, dustiness, porosity, frost resistance, resistance to abrasion and polishing, and asphalt absorption capacity [1,2,3,4,5].

What is Type 2 aggregate used for?

Type 2 compacts nicely to form a sound free-draining base for paths, walkways, tracks, patios and driveways. It can also be used to fill pot holes or as a backfill material.

What is coarse aggregate and fine aggregate?

Fine aggregates generally consist of natural sand or crushed stone with most particles passing through a 3/8-inch sieve. Coarse aggregates are any particles greater than 0.19 inch, but generally range between 3/8 and 1.5 inches in diameter.

Why are aggregates used in concrete?

Why do we use aggregate in concrete? Aggregate provides much of the strength, thermal and elastic properties of concrete, as well as dimension and volume stability. Including aggregate in the mix can also control shrinkage and prevent cracking.

What is all in aggregate?

All-in aggregate, similar to that of its name, is aggregate containing a proportion of material of all sizes from a pit, crushing plant or river bed. Also known as Ballast, this type of material is generally used to repair small cracks and pavement foundations.

What does M20 mean?

Grade of concrete is denoted by prefixing M to the desired strength in MPa. For example, for a grade of concrete with 20 MPa strength, it will be denoted by M20, where M stands for Mix.

What is the size of aggregate?

The usual range employed is between 9.5mm and 37.5mm in diameter. – Fine aggregates are usually sand or crushed stone that are less than 9.55mm in diameter. Typically the most common size of aggregate used in construction is 20mm. A larger size, 40mm, is more common in mass concrete.