1. What is Density of Hot Mix Asphalt?

Definition: This calculator determines the density of hot mix asphalt (HMA) based on weight and volume measurements.

Purpose: It helps construction professionals verify if their asphalt mix meets standard density requirements (typically 145 lb/ft³).

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \rho \) — Density of asphalt (lb/ft³)
• \( W \) — Weight of asphalt sample (lbs)
• \( V \) — Volume of asphalt sample (ft³)

Explanation: The weight is divided by volume to determine the density in pounds per cubic foot.

3. Importance of Asphalt Density

Details: Proper density ensures durability, resistance to deformation, and longevity of the pavement. Standard density is typically 145 lb/ft³.

4. Using the Calculator

Tips: Enter the weight of your asphalt sample in pounds and its volume in cubic feet. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is 145 lb/ft³ the standard density?
A: This density provides optimal balance between strength and workability for most paving applications.

Q2: What if my calculated density differs significantly?
A: Variations may indicate improper mix design, compaction issues, or measurement errors that need investigation.

Q3: How do I measure asphalt volume accurately?
A: Use water displacement method for small samples or calculate from area and thickness for larger sections.

Q4: Does temperature affect density measurements?
A: Yes, measurements should be made at standard temperature (usually 77°F) for accurate comparisons.

Q5: What's the density range for different asphalt types?
A: Typically 140-150 lb/ft³, with porous asphalt being lighter and stone mastic asphalt being denser.