Institute of Technology of Cambodia Road design II (TP)
TP7: MARSHALL MIX DESIGN
1. Introduction
Bituminous mix design is a systematic process to create asphalt mixes with desired
properties for specification applications which involves selecting aggregates and binders.
2. Objective
The objective of bituminous mix design is to determine their proportions, and testing to
ensure the resulting mix meets performance requirements such as stability, durability, and
resistance to rutting and cracking.
3. Materials and Equipment
Table 14: Materials and Equipment
Aggregate and Cement Balancer Mixer
Compactor AC Mold Bitumen
Funnel Scraper PP and PET
I4-GCI(A)-7 Page: 25
Institute of Technology of Cambodia Road design II (TP)
4. Sample Preparation
The number of samples for this experiment are 4. The optimum differential of asphalt is
between 0.5% from set point 4.5%, 5%, 5.5%, and 6.0%. The total sample weight of aggregates
including cement = 1200g.
Table 15: Required aggregate mass for each AC sample
Diameter (mm) Percentage of sample weight Mass (g)
25-19 10% 120
19-9.5 20% 240
9.5-4.75 15% 180
4.75-2.36 14% 168
2.36-1.18 8% 96
1.18-0.6 8% 96
0.6-0.3 7% 84
0.3-0.15 7% 84
0.15-0.075 4% 84
Cement 4% 48
Total 100% 1200
In this experiment, we were assigned to use Asphalt + 2% PP + 4% PET.
- PP: Bottle Cap
- PET: Bottle
Table 16: Total mass for each AC sample
Sample test 1st Sample 2nd Sample 3rd Sample 4th Sample
4.5% 5% 5.5% 6%
Asphalt
54g 60g 66g 72g
4% PET (g) 2.16 2.4 2.64 2.88
2% PP (g) 1.08 1.2 1.32 1.44
Aggregate + Cement (g) 1200 1200 1200 1200
Total (g) 1257.24 1263.6 1269.96 1276.32
I4-GCI(A)-7 Page: 26
