Details:

Creators:
Rajagopal, Arudi ; Minkarah, Issam
Rajagopal, Arudi ; Minkarah, Issam Less -
Corporate Creators:
University of Cincinnati. Department of Civil and Environmental Engineering
Corporate Contributors:
Ohio. Dept. of Transportation ; United States. Federal Highway Administration
Ohio. Dept. of Transportation ; United States. Federal Highway Administration Less -
Subject/TRT Terms:
[+]
Asphalt Concrete Overlay Break And Seat Comminution Concrete Overlays Crack And Seat Treatment Cracking Overlays (Pavements) Pavement Cracking Pavement Maintenance Pavement Performance Pavement Rehabilitation Reflection Cracking Reflection Cracks Slabs Surface Course (Pavements)
Publication/ Report Number:
FHWA/OH-2002/024
Resource Type:
Tech Report
Geographical Coverage:
Ohio
Edition:
Executive summary.
Corporate Publisher:
University of Cincinnati
Abstract:
This report presents details of a study conducted by the University of Cincinnati (UC), in association

with the Ohio Department of Transportation (ODOT), to evaluate the long term performance of asphalt

overlays on broken and seated (B/S) concrete pavements, using field experiments. The primary purpose

of this study is to evaluate the effectiveness of breaking and seating as a rehabilitation strategy for

retarding reflective cracking in asphalt concrete (AC) overlays on jointed reinforced concrete pavements

(JRCP). Several test sections were constructed by milling the original AC layer, breaking and seating the

concrete slabs and constructing new AC overlays. Control sections were constructed adjacent to the B/S

sections in the same way, but without breaking the underlying concrete slabs.

Two types of pavement breakers were used in this study, namely guillotine and pile hammer. The

majority of the concrete slabs were broken into 0.46 m (18") segments. The extent of breaking was

closely monitored. The performance of the test sections was monitored for a total period of nine years.

The monitoring data included deflection measurements, crack mapping, pavement condition surveys

(PCR) and roughness surveys on the original pavement and on the overlay. The results indicate that the

B/S treatment has a significant effect on the structural response and behavior of the resulting pavement.

Breaking the concrete slabs into smaller pieces resulted in a reduction in the flexural strength, an increase

in the surface deflection (50% to 100%), and a decrease in AREA and Spreadability (20 to 30%). The

Edward Ratio has been consistently high on B/S pavements (up to 30%) indicating a structural behavior

closer to flexible pavements.

The reflection cracks on all the control sections appeared within two years after the AC overlay and

within four years, more than 80% of the joints in all the control sections showed reflection cracks. The

B/S sections were relatively free of cracks after nine years. In particular, the test sections where a pile

hammer was used had less than 17% joint reflection cracks, while the control sections in the vicinity had

80% to 100% joint reflection cracks. This result clearly indicates that breaking and seating has been

extremely effective in delaying and minimizing reflection cracking.

The primary difference in cost of control and B/S sections could be in the type, extent and timing of

major rehabilitation. The mitigation of reflection cracking will cause the pavement PCR and

serviceability to remain higher for a longer period of time than if the reflection cracks were allowed to

come through. The lack of reflection cracking translates into a delay in future maintenance and

rehabilitation which will more than make up or the extra cost of breaking the pavement. The difference

in the cost will ofcourse depend on the type, extent and timing of major rehabilitation.

Based on the results of this study it is concluded that breaking and Seating is an effective technique for

the rehabilitation of composite pavements (AC over JRCP) and it provides a cost-effective solution for

the maintenance and rehabilitation of in-service composite pavements.


Format:
PDF
Funding:
State Job No. 14670(0)
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:29fb722ae0400cfee25357aa1c933059bb45e3598990b95d5ff733e736b98fd1
Download URL:
https://rosap.ntl.bts.gov/view/dot/20622/dot_20622_DS1.pdf
File Type:

Supporting Files

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