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Details

LTPP Profile Variability.

PB2001100960

Publication Date	2000
Personal Author	Evans, L. D.; Eltahan, A.
Page Count	184
Abstract	A study is conducted to evaluate the quality and variability of the International Roughness Index (IRI) data in the Long Term Pavement Performance (LTPP) database. Analysis of variance focused on the run-to-run and visit-to-visit IRI variability in the LTPP sections studied. Mean IRI values for asphalt concrete (AC), portland cement concrete (PC), and AC/PC overlaid sections ranged from 0.5 to 4.3 m/km. Based on the upgraded data set, confidence limits were developed for expected variability between repeated profile testing runs and for the expected change in IRI between subsequent visits. Analysis is also presented regarding the effects of saturation spikes, shifted profiles, moist pavement surfaces, and wheelpath location on IRI. Recommendation of the study address the methods used for field collection, office review methods, Information Management System (IMS) database design, and profile calibration.
Keywords	Asphalt concrete pavement Portland cement concrete Variance Confidence limits Profilometers Calibration Roughness Smoothness Percent saturation Concrete pavement LTPP(Long Term Pavement Performance) database IRI(International Roughness Index) Profiles
Source Agency	Federal Highway Administration
Corporate Authors	ERES Consultants, Inc., Columbia, MD.; Federal Highway Administration, McLean, VA. Office of Infrastructure
Supplemental Notes	Sponsored by Federal Highway Administration, McLean, VA. Office of Infrastructure Research and Development.
Document Type	Technical Report
Title Note	Final rept. Jul 97-Mar 00.
NTIS Issue Number	200103
Contract Number	DTFH61-96-C-00003

LTPP Profile Variability.

LTPP Profile Variability.
PB2001100960

Publication Date	2000
Personal Author	Evans, L. D.; Eltahan, A.
Page Count	184
Abstract	A study is conducted to evaluate the quality and variability of the International Roughness Index (IRI) data in the Long Term Pavement Performance (LTPP) database. Analysis of variance focused on the run-to-run and visit-to-visit IRI variability in the LTPP sections studied. Mean IRI values for asphalt concrete (AC), portland cement concrete (PC), and AC/PC overlaid sections ranged from 0.5 to 4.3 m/km. Based on the upgraded data set, confidence limits were developed for expected variability between repeated profile testing runs and for the expected change in IRI between subsequent visits. Analysis is also presented regarding the effects of saturation spikes, shifted profiles, moist pavement surfaces, and wheelpath location on IRI. Recommendation of the study address the methods used for field collection, office review methods, Information Management System (IMS) database design, and profile calibration.
Keywords	Asphalt concrete pavement Portland cement concrete Variance Confidence limits Profilometers Calibration Roughness Smoothness Percent saturation Concrete pavement LTPP(Long Term Pavement Performance) database IRI(International Roughness Index) Profiles
Source Agency	Federal Highway Administration
Corporate Authors	ERES Consultants, Inc., Columbia, MD.; Federal Highway Administration, McLean, VA. Office of Infrastructure
Supplemental Notes	Sponsored by Federal Highway Administration, McLean, VA. Office of Infrastructure Research and Development.
Document Type	Technical Report
Title Note	Final rept. Jul 97-Mar 00.
NTIS Issue Number	200103
Contract Number	DTFH61-96-C-00003