What Stripping Means in an Asphalt Mix

Stripping is binder letting go of the stone because of moisture. The mix can look brown and unravel from the bottom or the middle, sometimes visible in a pothole wall. It is a mix or drainage problem, not a surface stain. Sealer does not re-glue stripped mix.

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What stripped mix looks like

Sound asphalt breaks with dark, coated stones. Stripped mix breaks with stones that look brown or bare, because the binder has let go of the rock. You often see it in the wall of a pothole or in a core, not as a paint-like stain on top. The loss can start at the bottom or the middle of the layer where moisture sat, then the surface falls in once the support inside is gone. Traffic and water finish the unraveling. People sometimes call any brown scuff stripping. A plow mark on sound mix is a scrape. Stripping is binder that no longer holds the stone, and the pieces come apart in your hand instead of staying a coherent chunk.

Why moisture is the theme

Aggregate is supposed to be dry when it meets binder at the plant. Wet stone, water trapped in the pavement, or a base that pumps moisture upward can strip the bond over time. Rain on an open truck is a different problem from wet aggregate in the mix, but both involve water where the coating should be. Surface sealer does not crawl inside a layer and re-glue bare stones. A chemical additive is a plant design choice, not a DIY fix to pour into a pothole. Do not treat a brown pothole wall as a stain to paint. The conversation is drainage and a sound replacement mix. If the base under the hole is wet and pumping, new mix on that mud will strip or settle again.

How to talk about the repair

Show the contractor the bare stones in the broken face and tell them whether the driveway stays wet. Ask whether they see a drainage problem, a failed patch, or mix that should not have been placed. Replacement means removing the stripped material and paving on a dry, firm base, with a mix the plant will stand behind. Planning tons for the patch area use length times width times inches over 12 times 145 pounds per cubic foot divided by 2000. That is a planning estimate. The plant ticket is the real weight. A pothole patch is often too small for that formula to be the ordering method, and the plant minimum may govern. The point of the formula is not to understate a rebuild if the stripped area is large. Measure the real area once you know how far the brown, unbonded mix extends.

A practical sequence

Look at a broken face for bare brown stone instead of dark coated rock.
Separate that from a surface scrape or a sealer stain.
Fix the water that is reaching the layer before you place new mix.
Replace stripped mix on a firm base and treat any tonnage as a planning estimate.

The mistake to skip

Painting sealer over a brown, unraveling pothole and calling the binder restored.

Questions people ask

Can I add an anti-strip chemical myself?

No. Anti-strip treatment is a plant decision about how binder coats aggregate. It is not a bottle to mix into cold patch or to pour into a hole. This article does not give a DIY recipe. If stripping is in the driveway, the repair is to remove the damaged mix, fix drainage, and replace it with sound plant mix. Ask the plant what they ship. Do not invent a dose.

Is every brown spot stripping?

No. Iron stains, leaves, a rusty trailer, and a plow scuff can discolor sound asphalt that still holds together. Stripping shows bare stone and mix that crumbles, often from inside a pothole wall. If the surface is brown but intact and tight, clean it and watch it. If stones fall out of a brown break, treat it as moisture damage and look at drainage.

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