THE INFLUENCE OF ENVIRONMENT AND MATERIALS ON D-CRACKING
A three-phase program was undertaken to determine the effectiveness of reduced aggregate particle sizes in minimizing D-cracking in field exposures, to determine the importance of source of fine aggregate and quantity of maximum permissible aggregate particle size on freeze-thaw durability, and to evaluate the relative importance of certain field environmental conditions on D-cracking. These objectives were approached through laboratory freeze-thaw testing of concretes, resurveys of existing pavements in Ohio, and the construction and monitoring of a test road near Vermilion. Field surveys thus far indicate that reducing maximum aggregate particle sizes is beneficial, while the laboratory tests indicate that the proportion of coarser particle sizes has a significant effect on durability. The laboratory tests also showed that source of fine aggregate has essentially no bearing on durability, even when derived from coarse aggregate material of known low durability. Outdoor test plot studies, and moisture determinations on existing pavement concrete, reveal the overriding importance of aggregate pore structure on concrete durability. The test road was built in 1974 and 1975 and, therefore, is too young for the development of D-cracking. However, interim data indicate that aggregate particle size has a pronounced effect on the frequency of occurrence of popouts, while continuously reinforced pavement on asphalt-stabilized bases show greater vulnerability to non-uniform cracking than companion pavements on cement treated bases. /FHWA/
- Sponsored by the Ohio Department of Transportation, and the Department of Transportation, Federal Highway Administration.
Skokie, IL USA 60077
- Klieger, P
- Stark, D
- Teske, W
- Publication Date: 1978-10
- Pagination: 108 p.
- TRT Terms: Aggregates; D cracking; Field tests; Freeze thaw durability; Laboratory tests; Pores (Geology); Structures
- Uncontrolled Terms: Aggregate size; Pores
- Subject Areas: Bridges and other structures; Geotechnology; Highways; Pavements;
- Accession Number: 00195590
- Record Type: Publication
- Source Agency: Federal Highway Administration
- Report/Paper Numbers: FHWA-OH-78-06 Final Rpt.
- Contract Numbers: State Job 14258(0)
- Files: TRIS, ATRI, USDOT
- Created Date: Sep 15 1979 12:00AM