A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Interlayers Beneath Overlays on Flexible Pavements
The study's objective has been to evaluate the effectiveness of stress-relieving interlayers in reducing reflective cracking in overlays on flexible pavements. Six different types of full-width interlayers were installed on three construction projects, beneath New York's two standard overlay thicknesses -- 1 and 2 1/2-in. Three types of 1-ft wide interlayer strips covered individual transverse cracks on two additional construction projects. All were placed in 1980 and 1981. Strip applications failed within 1 year and are considered inappropriate for further use. Performance of full-width sections was monitored until 1987. Data were analyzed by t-test and the conclusion is that overlays with interlayers have lower average crack-return percentages than those without them. Cores were taken to determine if interlayers remained intact and kept water from entering cracks in the original pavement. Half the cores from cracked areas indicated that interlayers did not remain intact. Results of a simplified life-cycle-cost analysis indicated that interlayer treatments were not cost-effective compared to normal overlays. However, 1-in. overlays with interlayers were shown to be more economical than 2 1/2-in. overlays without them. Interlayer products should continue to be considered experimental features.
Interlayers Beneath Overlays on Flexible Pavements
The study's objective has been to evaluate the effectiveness of stress-relieving interlayers in reducing reflective cracking in overlays on flexible pavements. Six different types of full-width interlayers were installed on three construction projects, beneath New York's two standard overlay thicknesses -- 1 and 2 1/2-in. Three types of 1-ft wide interlayer strips covered individual transverse cracks on two additional construction projects. All were placed in 1980 and 1981. Strip applications failed within 1 year and are considered inappropriate for further use. Performance of full-width sections was monitored until 1987. Data were analyzed by t-test and the conclusion is that overlays with interlayers have lower average crack-return percentages than those without them. Cores were taken to determine if interlayers remained intact and kept water from entering cracks in the original pavement. Half the cores from cracked areas indicated that interlayers did not remain intact. Results of a simplified life-cycle-cost analysis indicated that interlayer treatments were not cost-effective compared to normal overlays. However, 1-in. overlays with interlayers were shown to be more economical than 2 1/2-in. overlays without them. Interlayer products should continue to be considered experimental features.
Interlayers Beneath Overlays on Flexible Pavements
H. J. Chen (author) / D. A. Frederick (author) / J. M. Vyce (author)
1992
39 pages
Report
No indication
English
Highway Engineering , Construction Equipment, Materials, & Supplies , Flexible pavements , Pavement overlays , Geotechnical fabrics , Stress relieving , Asphalt pavements , Bituminous concretes , Life-cycle costs , Surveys , Road materials , Cracks , Pavement condition , Highway maintenance , Asphalts , Cracking(Fracturing) , New York
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