Method for compensating differential compaction in an asphalt paving mat

A method for placing a mat of asphalt material on a subgrade having localized longitudinal deviations with an asphalt paver and a screed having an adjustable pull point, said method comprising the steps of:

• (a) establishing a nominal surface profile of the mat of asphalt material to be placed by the paver after compaction of the mat;
• (b) detecting the localized longitudinal deviations of the subgrade;
• and
• (c) adjusting the pull point of the screed in response to the detecting of the localized longitudinal deviations of the subgrade in order to modify the thickness of the mat of asphalt material placed by the paver such that the mat will have the nominal surface profile after compaction of the mat.

A method for placing a mat of asphalt material on a subgrade having localized longitudinal deviations with an asphalt paver and a screed having an adjustable pull point, said method comprising the steps of:

• (a) establishing a nominal surface of the mat of asphalt material to be placed by the paver, including the use of an averaging ski connected to the paver;
• (b) detecting the localized longitudinal deviations of the subgrade, including the use of a compensating ski connected to said averaging ski wherein said compensating ski is spaced between said averaging ski and the paver;
• and
• (c) adjusting the pull point of the screed in response to the detecting of the localized longitudinal deviations of the subgrade in order to modify the nominal surface such that differential compaction is substantially eliminated from the mat of asphalt material being placed by the paver after compaction of the mat.

A method for placing a mat of asphalt material on a subgrade having localized longitudinal deviations with an asphalt paver and a screed having an adjustable pull point, said method comprising the steps of:

• (a) establishing a nominal surface of the mat of asphalt material to be placed by the paver, including the use of an averaging ski connected to the paver;
• (b) detecting the localized longitudinal deviations of the subgrade, including the use of a compensating ski connected to said averaging ski wherein said averaging ski is spaced between said compensating ski and the paver;
• and
• (c) adjusting the pull point of the screed in response to the detecting of the localized longitudinal deviations of the subgrade in order to modify the nominal surface such that differential compaction is substantially eliminated from the mat of asphalt material being placed by the paver after compaction of the mat.

A method for placing a mat of asphalt material on a subgrade having localized longitudinal deviations with an asphalt paver and a screed having an adjustable pull point, said method comprising the steps of:

• (a) establishing a nominal surface of the mat of asphalt material to be placed by the paver, including the use of an averaging ski connected to the paver;
• (b) detecting the localized longitudinal deviations of the subgrade, including the use of a compensating ski connected to said averaging ski and further includes the use of a cam shaft pivotally mounted on said averaging ski, wherein said cam shaft has a sensor wand responsive to said compensating ski;
• and
• (c) adjusting the pull point of the screed in response to the detecting of the localized longitudinal deviations of the subgrade in order to modify the nominal surface such that differential compaction is substantially eliminated from the mat of asphalt material being placed by the paver after compaction of the mat, including providing said cam shaft with a plurality of settings corresponding to different compaction factors of the asphalt material being placed by the paver.

A method for placing a mat of asphalt material on a subgrade having localized longitudinal deviations with an asphalt paver and a screed having an adjustable pull point, said method comprising the steps of:

• (a) establishing a nominal surface of the mat of asphalt material to be placed by the paver, including the use of an averaging ski connected to the paver and a first non-contacting sensor responsive to said averaging ski;
• (b) detecting the localized longitudinal deviations of the subgrade, including the use of a compensating ski connected to said averaging ski and a second non-contacting sensor responsive to said compensating ski;
• and
• (c) adjusting the pull point of the screed in response to the detecting of the localized longitudinal deviations of the subgrade in order to modify the nominal surface such that differential compaction is substantially eliminated from the mat of asphalt material being placed by the paver after compaction of the mat.

A method for placing a mat of asphalt material on a subgrade having localized longitudinal deviations with an asphalt paver and a screed having an adjustable pull point, said method comprising the steps of:

• (a) establishing a nominal surface of the mat of asphalt material to be placed by the paver, including the use of an averaging ski connected to the paver and a first non-contacting sensor responsive to a stringline;
• (b) detecting the localized longitudinal deviations of the subgrade, including the use of a compensating ski connected to said averaging ski and a second non-contacting sensor responsive to said compensating ski;
• and
• (c) adjusting the pull point of the screed in response to the detecting of the localized longitudinal deviations of the subgrade in order to modify the nominal surface such that differential compaction is substantially eliminated from the mat of asphalt material being placed by the paver after compaction of the mat.