Mix Volumetrics — VFA
VFA calculation for asphalt mix design and QC.
VFA reads the binder's share of the skeleton's space — high VFA mixes are rich and rut-prone, low VFA mixes are dry and crack-prone. It's algebraically locked to Va and VMA, which is why specs quote all three: they're one geometry seen from three sides.
Formula
Note: Paving estimates only — the project mix design, agency specification and the plant's QC data govern. Temperature models are simplified; verify with an infrared gun and density gauge on the mat.
VFA calculation for asphalt mix design and QC. A free asphalt paving temperature & logistics tool — no sign-up, no upload, instant results in your browser.
About Mix Volumetrics — VFA
Mix Volumetrics — VFA computes the governing relationship VFA = (VMA − Va)/VMA × 100 live as you type. VFA reads the binder's share of the skeleton's space — high VFA mixes are rich and rut-prone, low VFA mixes are dry and crack-prone. It's algebraically locked to Va and VMA, which is why specs quote all three: they're one geometry seen from three sides. Defaults are pre-filled with realistic values for this exact scenario, and the worked example substitutes your numbers step by step so the math is never a black box.
How to use Mix Volumetrics — VFA
- 1Enter your values — VMA, Air voids (sensible defaults are pre-filled).
- 2Read the live results: Voids filled with asphalt.
- 3Check the "with your numbers" line to see VFA = (VMA − Va)/VMA × 100 substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Mix Volumetrics — VFA?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula VFA = (VMA − Va)/VMA × 100 with authoritative sources cited on the page (ASTM D2041/D2726 — Gmm & Gmb test methods; Asphalt Institute MS-2 — Mix design methods)
- ✓VFA reads the binder's share of the skeleton's space — high VFA mixes are rich and rut-prone, low VFA mixes are dry and crack-prone.
- ✓Niche-specific defaults give a meaningful worked answer the moment the page loads
Frequently asked questions
What formula does the mix volumetrics — vfa use?+
It evaluates VFA = (VMA − Va)/VMA × 100, exactly as published. Sources: ASTM D2041/D2726 — Gmm & Gmb test methods; Asphalt Institute MS-2 — Mix design methods. The substituted worked example on the page lets you verify every step against the textbook.
How should I read the result — and how far can I trust it?+
VFA reads the binder's share of the skeleton's space — high VFA mixes are rich and rut-prone, low VFA mixes are dry and crack-prone. Paving estimates only — the project mix design, agency specification and the plant's QC data govern. Temperature models are simplified; verify with an infrared gun and density gauge on the mat.
When is this calculator the right tool for the job?+
VFA calculation for asphalt mix design and QC. A free asphalt paving temperature & logistics tool. It's algebraically locked to Va and VMA, which is why specs quote all three: they're one geometry seen from three sides. For neighbouring scenarios, the related tools below cover the same engine with different presets.
Do I need to install anything or create an account?+
No. The tool is pure client-side JavaScript: open the page and it works, offline once loaded, with no account, no quota and no data leaving your device.
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