# What is TMD in asphalt?

## What is TMD in asphalt?

Average Theoretical Maximum Density (TMD) Determination • The average of the five (5) most recent TMD’s from a given JMF should be used for compaction control. • If less than 5 TMD’s are available, the averages will be based on the number of TMD’s available, excluding mix design data.

### How do you calculate bitumen content in asphalt?

The bulk relative density of the material is divided by the MTD of the material from which the VIM is calculated : VIM = (1 – BRD/MTD)x100. The aggregate component of the sample from which the bitumen was extracted during the bitumen content determination is used for the particle size analysis.

#### Which test sample is used for tests for tar and bitumen?

The test is conducted by using Ring and Ball apparatus. A brass ring containing test sample of bitumen is suspended in liquid like water or glycerine at a given temperature. A steel ball is placed upon the bitumen sample and the liquid medium is heated at a rate of 5 degree per minute.

What is ductility test of bitumen?

Ductility of Bitumen:- Ductility test of Bitumen is a measure of elasticity or adhesiveness of bitumen. Ductility of Bitumen is expressed as the distance in centimeters to which a standard briquette of bitumen can be stretched before the thread breaks as shown in fig.

What is float test of bitumen?

4.1 The float test characterizes the flow behavior or consistency of certain bituminous materials. 4.2 This test method is useful in determining the consistency of bitumen as one element in establishing the uniformity of certain shipments or sources of supply.

## What is Rice Value asphalt?

This value is based on the asphalt mixture’s maximum specific gravity – also known as the Rice value or G mm in Superpave. The maximum unit weight is determined by multiplying the Rice value by 62.4 pounds per cubic foot (PCF). For example, 2.500 is a typical Rice value. 2.500 X 62.4 = 156.0 PCF.

### What is GMM in bitumen?

The theoretical maximum specific gravity (Gmm) of a HMA mixture is the specific gravity excluding air voids. AASHTO T 209 and ASTM D 2041: Theoretical Maximum Specific Gravity and Density of Bituminous Paving Mixtures.

#### How is bitumen grade calculated?

In India, the bitumen grading is practised on the basis of penetration test, which is conducted at a temperature of 25°C, and 60/70 penetration grade bitumen is widely used. The penetration is measured in mm and it indicates the relative hardness of the bitumen. Higher the penetration, softer is the bitumen.

How is bitumen percentage calculated?

Asphalt binder content is calculated as the difference between the initial mass of the HMA and the mass of the residual aggregate, correction factor, and moisture content. The asphalt binder content is expressed as percent of moisture-free mix mass.

Is bitumen a code test?

Various tests are conducted on bitumen to assess its consistency, gradation, viscosity, temperature susceptibility, and safety….List of IS Codes Related to Bitumen Testing.

Tests for Bitumen with IS codes
Name of Test IS code Number
Ductility test IS: 1208-1978
Softening Point test IS: 1205-1978

## How do you test ductility of bitumen?

Ductility of Bitumen is expressed as the distance in centimeters to which a standard briquette of bitumen can be stretched before the thread breaks as shown in fig. 1. , that test should be conducted at 27 oC and the pull should be applied at the rate of 50 mm per minute.