Details:

Alternative Title:
Design and construction of a bonded fiber concrete overlay of CRCP (Louisiana, Interstate Route 10, August 1990).
Creators:
King, William M.
Corporate Creators:
Louisiana Transportation Research Center
Corporate Contributors:
United States. Federal Highway Administration
Subject/TRT Terms:
[+]
Bonded Concrete Overlay Bonding Concrete Overlays Concrete Shoulders Cracking Fiber Reinforced Concrete Paved Shoulders Pavement Performance
Publication/ Report Number:
FHWA/LA-92/266
Resource Type:
Tech Report
Geographical Coverage:
Louisiana
Corporate Publisher:
Louisiana Transportation Research Center
Abstract:
The purpose of this study was to evaluate a bonded steel fiber reinforced concrete overlay on an existing 8-inch CRC pavement on Interstate 10 south of Baton Rough, LA. The project objectives were to provide an overlay with a high probability for long term success by using a concrete mix high cement content, internal reinforcement, and with good bonding characteristics.

The existing 16-year old CRC pavement had carried twice its design load and contained only a few edge punch-out failures per mile. A 4-inch concrete overlay was designed for a 20-year service life. An additional level of reinforcement-bonding was provided which utilized curb type reinforcement bars epoxied into the existing slab. The primary purpose in the additional reinforcement was to provide positive bonding at the slab edges where thin overlays have a tendency to debond due to curling and/or warping. A 9-inch tied concrete shoulder was added to increase the pavements structural capacity.

The overall Serviceability Index of the pavement increased from 3.4 to 4.4 with measured Profile Index levels typically below the 5-inch per mile specification. Test revealed excellent bond strengths, and reduced edge deflections by 60% under a 22,000 pound moving single axle loading. Cores taken over transverse cracks in the overlay indicated reflection cracking from the transverse cracks in the original pavement. The final results reveal an estimated 35% of these cracks have reflected through and debonding has not occurred at the pavement edges. Anticipation of reflective cracking was one consideration in using the steel fibers which provide three-dimensional reinforcement.


Format:
PDF
Funding:
90-1P(B)
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:1c831710813f902e71b8dc7ba73287d3163c966245e02d5e3b7cdd637d7d137a
Download URL:
https://rosap.ntl.bts.gov/view/dot/22228/dot_22228_DS1.pdf
File Type:

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