Investigation Into the Deterioration of the Concrete on Route U.S. 206 Between Mileposts 81 and 95

Route U.S. 206 between Gladstone and Netcong is a reinforced Portland Cement Concrete pavement, most of which is between 38 and 40 years old. Approximately 10 years ago an asphaltic overlay was put down over certain sections where the concrete had deteriorated. Occasionally a whitish powder is seen oozing out of cracks in this bituminous overlay. In addition, certain section of the remaining concrete are experiencing rapid surface deterioration. Eight cores were taken at four separate locations. These cores showed that the sampled concrete was sound, except in locations where deterioration had already started. An analysis showed that the whitish powder oozing out of cracks in the asphaltic overlay was degraded cement. A tannish stain, which formed around deteriorated areas of concrete, was analyzed and described by the Bureau of Testing, Division of Materials, as a 5 to 15 carbon chain aliphatic. Its presence and the possible connection with the deterioration of the concrete nearby, remain unexplainable. Also unexplainable is a strip of roadway in excellent condition, directly adjacent to a badly deteriorated area. The roadway in excellent condition was estimated to be approx. 34 years old, and therefore only 5 years newer than the deteriorated concrete next to it -- hardly enough to explain the marked difference in appearance. High concentrations of salt were found in the concrete core samples taken. These concentrations increased as the degree of deterioration of the concrete worsened. The chloride content of the white powder, oozing out of the slits in the bituminous overlay, was almost 2-1/2 times greater than in the highest chloride-containing core. The cores, taken through the asphalt patches and/or overlays, showed evidence of this same white powder's presence at the interface between the asphalt and the underlying concrete. This indicates that the deterioration of the concrete is continuing underneath the various types of asphalt overlays and patches which have been applied on this road. It also points up the need for moisture and salt barriers at the interface between asphalt and concrete in future installations. Any coating with good adhesion to both asphalt and concrete, in addition to low salt water permeability, should be satisfactory.

• Record URL:
  • http://www.nj.gov/transportation/business/research/reports/FHWA-NJ-1969-015.pdf
• 
• Corporate Authors:

  New Jersey Department of Transportation

  Bureau of Structures and Materials, 1035 Parkway Avenue
  Trenton, NJ  United States  08625

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Publication Date: 1968-9

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; Tables;
• Pagination: 18p

Subject/Index Terms

• TRT Terms: Bituminous overlays; Chloride content; Core samples; Moisture barriers; Preventive maintenance; Reinforced concrete pavements
• Uncontrolled Terms: Deteriorated concrete
• Geographic Terms: New Jersey
• Subject Areas: Highways; Maintenance and Preservation; Pavements;

Filing Info

• Accession Number: 01665505
• Record Type: Publication
• Report/Paper Numbers: FHWA/NJ-69-015-7779
• Files: TRIS, ATRI, USDOT, STATEDOT
• Created Date: Apr 2 2018 12:31PM