# What do you mean by aggregate function?

## What do you mean by aggregate function?

An **aggregate function** is a mathematical computation involving a set of values that results in a single value expressing the significance of the data it is computed from. **Aggregate functions** are often used in databases, spreadsheets and many other data manipulation software packages now common in the workplace.

## What is the use of aggregate function?

An **aggregate function** performs a calculation on a set of values, and returns a single value. Except for COUNT(*) , **aggregate functions** ignore null values. **Aggregate functions** are often used with the GROUP BY clause of the SELECT statement.

## What is the function of aggregate in concrete?

**Aggregates** make up 60-80% of the volume of **concrete** and 70-85% of the mass of **concrete**. **Aggregate** is also very important for strength, thermal and elastic properties of **concrete**, dimensional stability and volume stability. **Cement** is more likely to be affected by shrinkage.

## What are the properties of aggregate suitable for road construction?

Not only that aggregates should be strong and durable, they should also possess proper shape and size to make the pavement act monolithically. Aggregates are tested for **strength**, **toughness**, **hardness**, shape, and water absorption.

## Why is aggregate important?

**Aggregate** occupies most of the volume of the 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.

## Can I make concrete without aggregate?

**Concrete without aggregate** is know as mortar. Mortar happens to be a mixture of fine **aggregate** such as sand and a binding material like **cement** mixed together with water. The **cement** sand ratio depends on the purpose mortar is used for. ... For **making** a cube M25, what is the ratio of **cement**, sand, and **aggregate**?

## What is specific gravity of fine aggregate?

**Specific gravity of fine aggregate** (sand) is the ratio of the **weight** of given volume of **aggregates** to the **weight** of equal volume of water. The **specific gravity** of sands is considered to be around 2.

## How do you calculate specific gravity of aggregate?

The coarse **aggregate specific gravity** test (Figure 1) is used to **calculate the specific gravity** of a coarse **aggregate** sample by **determining** the ratio of the **weight** of a given volume of **aggregate** to the **weight** of an equal volume of water. It is similar in nature to the fine **aggregate specific gravity** test.

## What is the purpose of specific gravity test?

Knowing the specific gravity will allow determination of a fluid's characteristics compared to a standard, usually **water**, at a specified temperature. This will allow the user to determine if the test fluid will be heavier or lighter than the standard fluid.

## What is the difference between density and specific gravity?

**Density** is defined as mass per unit volume. It has the SI unit kg m-3 or kg/m3 and is an absolute quantity. **Specific gravity** is the ratio of a material's **density** with that of water at 4 °C (where it is most dense and is taken to have the value 999.

## Is density greater than specific gravity?

Converting Between **Density** and **Specific Gravity** **Density** is very slightly less **than specific gravity**.

## What is the difference between density and relative?

**Density** is by definition the ratio of the mass and volume of a body. ... **Relative density** is the ratio **between** the **density** of a measuring substance and the **density** of some other reference substance at a given temperature (typically water).

## What is difference between mass and volume?

**Volume** – How much space an object or substance takes up. **Mass** – Measurement of the amount of matter **in an** object or substance.

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