Page 9 - Structural Highway Design_Neat

6. Moisture Damage.
7. Air voids that are either too great or too low can cause a significant

reduction in pavement life.

5.3. Factors Affecting Compaction

HMA compaction is influenced by a factors:
1) environment,
2) mix and structural design,
3) construction

Table 6-4: Factors Affecting Compaction.

Environmental Mix Property Factors Construction Factors
Factors
Aggregate Rollers
Temperature
• Gradation • Type
• Ground • Size • Number
temperature • Shape • Speed and timing
• Fractured faces • Number of passes
• Air temperature • Volume • Lift thickness
• Wind speed
• Solar flux

Asphalt Binder Other

• Chemical properties • HMA production
• Physical properties temperature
• Amount
• Haul distance
• Haul time
• Foundation suppor

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