CCIL Hot Mix Asphalt Field Density Testing

Question 1

What is the primary purpose of field density testing on hot mix asphalt (HMA) pavements?

Accepted Answer

To verify that the compacted pavement meets specified density requirements

Answer

To determine the air void content used in the mix design

Answer

To measure the temperature of the asphalt during placement

Answer

To assess the aggregate gradation of the compacted mat

Question 2

What does the term 'percent compaction' mean in the context of HMA field testing?

Accepted Answer

The ratio of field density to maximum theoretical density, expressed as a percentage

Answer

The percentage of aggregate compacted relative to binder content

Answer

The percentage reduction in lift thickness after rolling

Answer

The air void percentage measured directly in the field

Question 3

Maximum Theoretical Density (MTD) of HMA is also commonly referred to as what?

Accepted Answer

Rice density

Answer

Bulk specific gravity

Answer

Apparent specific gravity

Answer

Marshall density

Question 4

What is a typical minimum percent compaction specification for HMA pavements?

Accepted Answer

92–96%

Answer

80%

Answer

85%

Answer

99–100%

Question 5

Which ASTM standard governs the determination of maximum theoretical specific gravity and density of bituminous paving mixtures?

Accepted Answer

ASTM D2041

Answer

ASTM D1559

Answer

ASTM D6931

Answer

ASTM D3203

Question 6

What is the primary advantage of using a nuclear density gauge for HMA field density testing compared to core extraction?

Accepted Answer

It offers rapid, non-destructive in-place density measurements

Answer

It provides permanent core samples for laboratory analysis

Answer

It requires no calibration or regulatory compliance

Answer

It eliminates the need for any reference density values

Question 7

What two fundamental properties does a nuclear density gauge measure during HMA field testing?

Accepted Answer

Wet density and moisture content

Answer

Temperature and viscosity

Answer

Gradation and binder content

Answer

Air voids and Voids in Mineral Aggregate (VMA)