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Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations

Report
This report is an archived publication and may contain dated technical, contact, and link information
Publication Number: FHWA-HRDI-13
Date: April 2004

Framework for LTPP Forensic Investigations - Final

Appendix D - Coring Layout and NDT Location Suggestions

AC and AC/AC

Figure 4: Core locations for L T P P A C-surfaced test section. An illustration of suggested locations between stations 0 and 152 for obtaining 104-millimeter cores at F W D test locations on an L T P P A C-surfaced test section.

Figure 5: Crack core locations for L T P P A C test section. An illustration of suggested locations between stations 0 and 152 for obtaining 104-millimeter cores at areas of fatigue on an L T P P A C-surfaced test section. One core should be over the crack and another should be in an uncracked area within 0.5 meter of the crack core.

JCP and CRCP

Figure 6: Core locations for L T P P J C P-surfaced test section. An illustration of suggested locations between stations 0 and 152 for obtaining 104-millimeter cores at midslab F W D test locations in every second slab starting in the first slab on an L T P P J C P-surfaced test section.

Figure 7: Crack core locations for L T P P J C P test section. An illustration of suggested locations between stations 0 and 152 for obtaining 104-millimeter cores at areas of fatigue on an L T P P J C P-surfaced test section. A single core should be obtained over each type of crack, including corner breaks, longitudinal cracks, and joint spalls.

AC/JCP

Figure 8: Distress mechanism locations for L T P P A C/ J C P test section. An illustration of suggested locations between stations 0 and 152 to identify distress mechanisms in an L T P P A C J C P-surfaced test section. This includes coring over longitudinal cracks, sawing and sealing on suspected reflection cracks, and milling the A C layer to expose the P C C joint.

Suggested Non-Destructive Testing of PCC Pavement

Figure 9: Locations for N D T L T P P J C P-surfaced test section using pachometer. An illustration of suggested locations between stations 0 and 152 for a pachometer survey to determine the layout and depth of reinforcing steel and location of dowels. Survey area should be 3 meters wide by full-lane width.

Figure 10: Locations for N D T L T P P J C P-surfaced test section using S A S W/ S L A B I R/ G P R measurement. An illustration of suggested locations between stations 0 and 152 to conduct G P R, S A S W, and/or impact echo measurements for void detection and to develop layering profiles. Measurement area should be in the inner and outer wheelpaths and at both edges of the lane.

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