32. Mix Plants

Question 1

Purpose of HMA plants

Answer 1

Produce quality HMA that contains the desired specifications

Question 2

Types of plants

Answer 2

Batch and drum mixer

Question 3

What type of plant is most common and why?

Answer 3

Drum mixer because it continuously produces HMA

Question 4

Common plant operations

Answer 4

Cold aggregate storage and feeding
Emission control systems
Mix storage
Weighing and handeling

Question 5

Asphalt mixture production

Answer 5

Aggregate must be properly stockpiled and carefully proportioned before mixing and drying, obtain uniform coating of binder, store and transport HMA

Question 6

Asphalt binder storage tanks

Answer 6

Maintain constant temperature
Stir to ensure consistency

Question 7

Truck loading

Answer 7

Proper loading of trucks helps reduce segregation (particle size and thermal)
1st portion front, then 2nd back, then final in the middle

Question 8

Storage silos

Answer 8

Holds mixes at proper temperatures
Allows for accurate and rapid loading of trucks