Weight of Asphalt per Square Foot

Asphalt Weight Formula:

\[ W_{sf} = \frac{D \times \rho}{12} \]

Weight per Square Foot (lb/ft²):

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1. What is Weight of Asphalt per Square Foot?

Definition: This calculator estimates the weight of asphalt per square foot based on the depth of asphalt and its density.

Purpose: It helps construction professionals and engineers determine the weight load of asphalt surfaces for structural analysis and material estimation.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ W_{sf} = \frac{D \times \rho}{12} \]

Where:

\( W_{sf} \) — Weight per square foot (lb/ft²)
\( D \) — Depth of asphalt (inches)
\( \rho \) — Density of asphalt (lb/ft³)

Explanation: The asphalt depth is multiplied by density and divided by 12 to convert inches to feet for proper square foot calculation.

3. Importance of Asphalt Weight Calculation

Details: Proper weight estimation is crucial for structural engineering, pavement design, and ensuring the underlying surface can support the asphalt load.

4. Using the Calculator

Tips: Enter the asphalt depth in inches and density in lb/ft³ (default 145 lb/ft³ for typical hot-mix asphalt). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the typical density of asphalt?
A: Hot-mix asphalt typically has a density of 145 lb/ft³, but this can range from 140-150 lb/ft³ depending on mix design.

Q2: Why divide by 12 in the formula?
A: This converts the depth from inches to feet since density is in lb/ft³ and we want weight per square foot.

Q3: How do I calculate total weight for an area?
A: Multiply the weight per square foot by the total area in square feet.

Q4: Does temperature affect asphalt weight?
A: While density changes slightly with temperature, for most calculations the standard density is sufficient.

Q5: What about different asphalt mixes?
A: For porous asphalt or stone-matrix asphalt, use a lower density (130-140 lb/ft³).