Classification of aggregates based on density
What are the 3 classifications of aggregates?
Classification of Aggregates as per Size and Shape -Coarse and Fine Aggregates
- Rounded Aggregate.
- Irregular Aggregates.
- Angular Aggregates.
- Flaky Aggregates.
- Elongated Aggregates.
- Flaky and Elongated Aggregates.
What are the various classifications 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. Rounded aggregates are the main factor behind workability.
What are dense aggregates?
What are high-density aggregates? A. High-density aggregates generally consist of high-density minerals or rocks, or they consist of man-made materials, such as steel or iron.
What is bulk density of aggregate?
The bulk density or unit weight of an aggregate is defined as mass of the aggregate per unit volume . it is expressed in kg/liter. The factors affecting bulk density of aggregate are 1. How densely the aggregates are packed .
What is the density of sand?
between 1520-1680 kg/m3
The approximate bulk density of sand that is commonly used in normal-weight concrete is between 1520-1680 kg/m3 (95-105 lb/ft3)
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.
What are the characteristics of aggregate?
Aggregates must conform to certain requirements and should consist of clean, hard, strong, and durable particles free of chemicals, coatings of clay, or other fine materials that may affect the hydration and bond of the cement paste. The characteristics of the aggregates influence the properties of the concrete.
How is the aggregate classified according to texture?
These aggregate category are generally hard, dense and fine-grained aggregates are smooth textured. These aggregates have lesser surface area because of lesser irregularities. When these aggregates are employed, lesser amount of cement is necessary for the lubrication purpose.
What is the classification of the aggregates based on the computed unit weight?
The most common classification of aggregates on the basis of bulk specific gravity is lightweight, normal-weight, and heavyweight aggregates. This section specifically address the different characteristics found in both lightweight and heavyweight aggregates.
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 type of aggregate is used in 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). The resulting concrete can be used in its natural state or crushed, according to its use and application.
Which aggregate is best for concrete?
Gravel aggregates
Gravel aggregates are used for foundations and concretes, as well as products made of reinforced concrete and materials used in road construction. There are two types of gravel aggregates: Scrabbled stone – regular, natural or crushed.
What is No 4 aggregate?
The particles passing the 4.75 mm (No. 4) sieve shall be the product of crushing rock larger than 12.5 mm (1/2 inch) and shall be non-plastic when tested in accordance with AASHTO T 90.
What is the density of 10mm aggregate?
10mm Concrete Aggregate
| PROPERTY | UNIT | TYPICAL |
|---|---|---|
| Particle Density (Dry) | t/m3 | 2.5-2.7 |
| Particle Density (SSD) | t/m3 | 2.6-2.8 |
| Wet Strength | kN | 70-90 |
| Dry Strength | kN | 80-100 |
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 sieve No 40?
The No. 40 mesh is a medium size U.S. Standard mesh size with a 0.0165″ (425μm) nominal sieve opening with a typical wire diameter of 0.28mm.
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. Individual materials shall meet the requirements specified below: 1. Crushed stone shall be free from silt and clay.
What is No 2 aggregate?
#2 (2 1/2″) crushed stone is a combination of assorted sized material that ranges from 1 1/2″ through 2 1/2″ which has been crushed and compacted in size, then processed through a square screen 3″ in size.