Fix the Line Behind the Screed for a Smooth Mat

When we’re talking about quality control/quality assurance during paving operations, one of the most obvious signs of a problem is a line (or two) in the mat. Here are a few common “lines” and common causes with quick cures.

• If you see an area about a foot wide of different-sized rock in the center of the mat, you may have worn reverse augers in the center of the auger assembly. It’s time to call the mechanic for a quick maintenance check.
• If you see that area of different-sized rock in the center of the mat, you may only have the auger assembly set too high. Do some troubleshooting to assess what’s taking place at the auger and fix any worn or broken pieces.
• If you see a line (or gouge) trailing behind the right or left side of the main screed plate, check the height (and slope) of your extensions. You want the extensions to be perfectly lined up with the main screed to avoid a divot where the roller operator can’t get density.
• If you see the left or right side of the pavement dragging or looking like a rough line of rock while the rest of the mat is a smoothly buttered lane, check your temperatures. The section of the screed where the line’s coming from might have a broken heating element or the temperature might be set wrong. Use a temperature gun to measure multiple points across the screed to ensure the whole plate is the same, correct temperature.

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