Cracking and Seating to Retard Reflective Cracking - Hamilton County, HR-277, 1993

(1993) Cracking and Seating to Retard Reflective Cracking - Hamilton County, HR-277, 1993. Transportation, Department of

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Abstract

The crack and seat (C & S) method of rehabilitating concrete pavements has been proposed to reduce the incidence of reflective cracking in asphalt overlays. These cracked pieces help reduce the thermal effects on lateral joint movement while the seating of slab pieces reduces vertical movement. This 1986 project demonstrated that a 0.6 m x 0.9 m (2 ft x 3 ft) cracking pattern was optimal to retard reflective cracking in an asphalt overlay. The best performance among three C & S test sections was section 4 with a 0.6 m x 0.9 m (2 ft x 3 ft) cracking pattern and 7.6 cm (3 in) overlay. Structural ratings determined from the Road Rater™ indicated little difference between each C & S section with varying AC thicknesses and crack spacings. Although reflection cracking is reduced in the early years after construction, the effectiveness of the C & S method diminishes over time.

Item Type: Departmental Report
Keywords: Bituminous overlays, Crack and seat treatment, Longitudinal cracking, Performance evaluations, Prevention, Reflection cracking; Test sections, Transverse cracking
Subjects: Transportation > Pavements
Transportation
Transportation > Railroads
Transportation > Roads and highways
Transportation > Design and Construction
ID Code: 19651
Deposited By: Iowa DOT Library
Deposited On: 01 Jun 2015 19:21
Last Modified: 01 Jun 2015 19:21
URI: http://publications.iowa.gov/id/eprint/19651