26.2. Specimen preparation

Try these first

1. 1.

   What temperature are aggregates heated to?

   Hint

   Look for the range given in the text.

2. 2.

   How many blows are given during compaction?

   Hint

   Think about the compaction step in the preparation.

3. 3.

   What temperature range is used to heat aggregates?

   • 150°C-170°C
   • 175°C-190°C
   • 200°C-210°C

   Hint

   Look for the temperature mentioned in the preparation process.

4. 4.

   True or False: The bitumen should be mixed with aggregates at temperatures above 160°C.

   • True
   • False

   Hint

   Consider the mixing section in the text.

5. 5.

   If a batch of aggregates is heated to 200°C instead of 190°C, discuss what impact this could have on the mixture’s properties.

   Hint

   Consider how extreme temperatures affect material properties.

6. 6.

   Discuss why maintaining a compact thickness of 63.5 mm is critical in the Marshall testing phase.

   Hint

   Think about the experimental consistency needed.