Job Mix Formula Quiz

What is one of the advantages of using asphalt for paving?

• Difficult to repair

• Expensive building material

• Slippery and unsafe

• Flexible and fit a specific purpose

What is the predominant mix design method for dense-graded HMA mixes?

• Superpave

• Marshall Method

• U.S. Army Corps of Engineers method

• Hveem

What is the specific objective of mix design related to workability?

• To ensure a durable pavement

• To limit the permeability of harmful air and moisture

• To resist deformation from imposed loads

• To permit efficient placement without segregation

What is the primary cause of rutting in asphalt pavements?

• High traffic volume

• Excessive inter-particle forces

• Poor in situ subgrade quality

• Inadequate mix stability

What is the main purpose of hydrated lime in HMA?

• To increase stripping

• To reduce skid resistance

• To improve resistance to fracture growth

• To decrease durability

What does the effective specific gravity of the aggregate represent?

• The ratio of the mass of aggregate in air to the mass of water

• The ratio of the oven dry mass of aggregate to the mass of water

• The ratio of the mass of aggregate in air to the mass of water

• The ratio of the mass of aggregate in water to the mass of water

What does the air voids in a compacted paving mixture consist of?

• Small air spaces between the coated aggregate particles

• Intergranular void space between the aggregate particles

• Large void spaces between the aggregate particles

• Water permeable voids not filled with asphalt

What is the specific objective of mix design related to durability?

• To resist deformation from imposed loads

• To resist aggregate breakdown due to wetting and drying

• To permit efficient placement without segregation

• To limit the permeability of harmful air and moisture

What is the main purpose of mineral filler in bituminous mix?

• To improve durability and flexibility

• To reduce skid resistance

• To increase stripping

• To improve resistance to fracture growth

What is the primary cause of fatigue cracking in asphalt concrete?

• Cracking due to sudden drop in temperature

• Repeated flexing caused by wheel loads

• Chemical reaction with oxygen

• Inability to withstand traffic loads