AP-1200 ASPHALT PAVER Mat Finish Problems Caterpillar


Mat Finish Problems
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1.1. Mat Not Compacted Properly
2.1. Screed Marks In Mat
3.1. Wavy Surface (Long Waves)
4.1. Wavy Surfaces (Short Waves)
5.1. Bad Longitudinal Joint
6.1. Bad Transverse Joint
7.1. Surface Cracks In Center Of Strip
8.1. Streak In Center Of Strip
9.1. Transverse Hairline Cracks In Surface
10.1. Deep Transverse Cracks Full Width
11.1. Tearing - All Across Mat
12.1. Surface Cracks At Edges

Problems in obtaining the correct mat surface finish can be traced to several different sources.

1. Improper mix control - improper temperature control, unstable mix, improperly graded mix, etc.
2. Improper rolling of the mat - not enough, too much, too soon, too late, etc.
3. Improper adjustment of the paver - too much lead crown, too little lead crown, vibrator speed wrong, etc.
4. Improper operation of the paver - paving too fast, paving too slow, running paver out of material, etc.
5. Improper preparation of the surface on which the mat is laid.

A center segregation spoiler is available for use when segregation or mat streaking in the center of the screed occurs. The spoiler is intended to reduce the possibility of segregation when paving thin lifts of 5/8 inch (15.88 mm) or less and when using larger aggregate mixes with a low percentage of fines.

The following trouble shooting charts will help in locating the cause of mat defects and in correcting the cause.

Mat Not Compacted Properly

Screed Marks In Mat

Wavy Surface (Long Waves)

Wavy Surfaces (Short Waves)

Bad Longitudinal Joint

Bad Transverse Joint

Surface Cracks In Center Of Strip

Streak In Center Of Strip

Transverse Hairline Cracks In Surface

Deep Transverse Cracks Full Width

Tearing - All Across Mat

Surface Cracks At Edges