1. What is the Density of Compacted Asphalt Calculator?

Definition: This calculator estimates the density of compacted hot mix asphalt (HMA) based on the compaction factor.

Purpose: It helps engineers and construction professionals determine the compacted density of asphalt mixtures for quality control and material estimation.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \rho \) — Density of compacted HMA (lb/ft³)
• \( F_c \) — Compaction factor (dimensionless, typically 1.1 for 10% compaction)

Explanation: The base density (145 lb/ft³) is multiplied by the compaction factor to account for the degree of compaction in the asphalt mix.

3. Importance of Asphalt Density Calculation

Details: Proper density ensures durability, resistance to deformation, and longevity of the asphalt pavement. It's critical for quality control in road construction.

4. Using the Calculator

Tips: Enter the compaction factor (default 1.1 for 10% compaction). The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical compaction factor for asphalt?
A: For 10% compaction, F_c ≈ 1.1. This may vary based on mix design and compaction requirements.

Q2: Why is 145 lb/ft³ used as the base density?
A: This represents the typical density of uncompacted hot mix asphalt before rolling and compaction.

Q3: How does compaction affect asphalt performance?
A: Proper compaction increases density, which improves strength, reduces permeability, and enhances durability.

Q4: What density should I aim for in road construction?
A: Typically 92-96% of theoretical maximum density (Gmm), which usually corresponds to about 140-150 lb/ft³ compacted density.

Q5: How is field density measured?
A: Common methods include nuclear density gauges or coring with laboratory testing to verify compaction meets specifications.