Classification of aggregates according to size and shape
What is the classification of aggregates according to size and shape?
The main classification of aggregates based on the shape are: Rounder Aggregates. Irregular Aggregates. Angular Aggregates.
What are the different classification of aggregates?
Classification of Aggregates
| Category | Unit Weight of Dry-rodded Aggregate (kg/m3) | Typical Concrete Strengths (MPa) |
|---|---|---|
| Ultra lightweight Lightweight Structural Lightweight Normal weight Heavyweight | <500 500-800 650-1100 1100-1750 >2100 | <7 7-14 17-35 20-40 20-40 |
What is aggregate classification of aggregate?
The recycled aggregate are manufactured by crushing inert construction and demolition waste. The artificial aggregates are made up by various waste material iron ore, artificial cinders, Burnt clay, Steel rivet etc. Crushed rock aggregates is formed by crushing the various Rocks quarries e.g. stone aggregate.
What are the 4 main types of aggregates?
Aggregates Definition:
It includes gravel, crushed rock, sand, recycled concrete, slag, and synthetic aggregate.
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.
What are the three classes of aggregates?
Types of Aggregate In Construction
The following aggregate types are most used on construction site, Rounded Aggregate. Irregular Aggregates. Angular 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 is single size aggregate?
Single-size aggregate is based on a nominal size specification. It contains about 85 to 100 percent of the material which passes through that specified size of the sieve and zero to 25% of which is retained in the next lower sieve. A graded aggregate contains more than one single-size aggregate.
How are aggregate classified based on particle size?
Based on the grain size, the aggregates are classified into two types. The fine aggregates are used in concrete as a filler material to fill the voids. The coarse aggregates are used in concrete to develop the strength of the element. The difference between the fine & coarse aggregate are listed below.
What is the effect of size and shape of aggregate in concrete?
The shape and texture of aggregate affects the properties of fresh concrete more than hardened concrete. Concrete is more workable when smooth and rounded aggregate is used instead of rough angular or elongated aggregate.
How many types of aggregate sizes are there?
5.3 Classification of Coarse Aggregates According to the Size
| Coarse aggregate | Size |
|---|---|
| Fine gravel | 4mm – 8mm |
| Medium gravel | 8mm – 16mm |
| Coarse gravel | 16mm – 64mm |
| Cobbles | 64mm – 256mm |
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 is the shape of aggregates?
The different shapes of aggregates are: Rounded – Natural aggregates smoothed by weathering, erosion and attrition. Rocks, stone, sand and gravel found in riverbeds are your most common rounded aggregates.
Which shape of aggregate is good for concrete strength?
Cubical aggregate has maximum strength in concrete as it has good packing and strength in all direction. Rounded aggregate is not suitable for concrete. Flaky means have less thickness, elongated means having more length.
How is aggregate size measured?
The most popular field test to measure the quality of aggregate is the sieve test. It is not possible to measure shape characteristic and other parameters by sieve analysis. Therefore, it is essential to develop rapid assessment techniques for quality control of aggregate.
What is single size aggregate?
Single-size aggregate is based on a nominal size specification. It contains about 85 to 100 percent of the material which passes through that specified size of the sieve and zero to 25% of which is retained in the next lower sieve. A graded aggregate contains more than one single-size aggregate.
What is particle shape and texture of aggregate?
The shape of aggregate particles can be classified as either angular, subangular, subrounded or rounded. Each shape has advantages and disadvantages depending on the desired properties of the finished product.
What is the size of coarse aggregates?
Coarse aggregates are any particles greater than 0.19 inch, but generally range between 3/8 and 1.5 inches in diameter.