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Dynamic Modulus of Cold-in-Place Recycling (CIR) Material.

PB2018101323

Publication Date	2018
Personal Author	Islam, M. R.; Kalevela, S. A.; Rivera, J. A.
Page Count	154
Abstract	This study investigates the dynamic modulus of Cold-in-Place Recycling (CIR) pavement material and its performance using pavement performance data, field testing, laboratory testing, and Pavement Mechanistic-Empirical Design Guide (PMED) software analysis. Colorado Department of Transportation (CDOT) has 37 projects with over 8 million square yards using CIR materials. Sites from ten projects were selected to monitor the performances, and collect samples for laboratory testing. Field sampling, R-value testing of base/subgrade, and resilient modulus of base/subgrade were conducted. Dynamic moduli testing on the CIR cores were conducted by the CDOT. PMED software analysis was conducted using the data to examine the CDOT-calibrated PMED software for overlay design with CIR data. Results show measured distresses of CIR rehabilitation techniques are mostly below the threshold values during the service period. International Roughness Index, rutting, and transverse cracking never exceeded the threshold values during the studied period. Only two CIR pavements exceeded the threshold values for fatigue cracking after 8-10 years of service. Measured distresses of CIR rehabilitation techniques are similar to conventional pavement. The laboratory test results show CIR has about 50% less dynamic modulus compared to the traditional asphalt mixture. The CDOT-calibrated PMED software predicts the International Roughness Index (IRI) and the rutting of CIR overlaid pavement well but underestimates fatigue cracking.
Keywords	Cold-in-place-recycling (CIR) Pavement Mechanistic-Empirical Design Guide (PMED) Performance Dynamic modulus Conventional pavement Colorado Department of Transportation (CDOT)
Source Agency	Federal Highway Administration
NTIS Subject Category	43G - Transportation 50A - Highway Engineering 50B - Civil Engineering 50C - Construction Equipment, Materials, & Supplies 91B - Transportation & Traffic Planning 89D - Structural Analyses
Corporate Authors	University of Southern Colorado, Pueblo.; Federal Highway Administration, Denver, CO. Colorado Div.; Colorado Dept. of Transportation, Denver.
Document Type	Technical Report
Title Note	Final rept. (June 2016 - Sept. 2017).
NTIS Issue Number	201822

Dynamic Modulus of Cold-in-Place Recycling (CIR) Material.

Dynamic Modulus of Cold-in-Place Recycling (CIR) Material.
PB2018101323

Publication Date	2018
Personal Author	Islam, M. R.; Kalevela, S. A.; Rivera, J. A.
Page Count	154
Abstract	This study investigates the dynamic modulus of Cold-in-Place Recycling (CIR) pavement material and its performance using pavement performance data, field testing, laboratory testing, and Pavement Mechanistic-Empirical Design Guide (PMED) software analysis. Colorado Department of Transportation (CDOT) has 37 projects with over 8 million square yards using CIR materials. Sites from ten projects were selected to monitor the performances, and collect samples for laboratory testing. Field sampling, R-value testing of base/subgrade, and resilient modulus of base/subgrade were conducted. Dynamic moduli testing on the CIR cores were conducted by the CDOT. PMED software analysis was conducted using the data to examine the CDOT-calibrated PMED software for overlay design with CIR data. Results show measured distresses of CIR rehabilitation techniques are mostly below the threshold values during the service period. International Roughness Index, rutting, and transverse cracking never exceeded the threshold values during the studied period. Only two CIR pavements exceeded the threshold values for fatigue cracking after 8-10 years of service. Measured distresses of CIR rehabilitation techniques are similar to conventional pavement. The laboratory test results show CIR has about 50% less dynamic modulus compared to the traditional asphalt mixture. The CDOT-calibrated PMED software predicts the International Roughness Index (IRI) and the rutting of CIR overlaid pavement well but underestimates fatigue cracking.
Keywords	Cold-in-place-recycling (CIR) Pavement Mechanistic-Empirical Design Guide (PMED) Performance Dynamic modulus Conventional pavement Colorado Department of Transportation (CDOT)
Source Agency	Federal Highway Administration
NTIS Subject Category	43G - Transportation 50A - Highway Engineering 50B - Civil Engineering 50C - Construction Equipment, Materials, & Supplies 91B - Transportation & Traffic Planning 89D - Structural Analyses
Corporate Authors	University of Southern Colorado, Pueblo.; Federal Highway Administration, Denver, CO. Colorado Div.; Colorado Dept. of Transportation, Denver.
Document Type	Technical Report
Title Note	Final rept. (June 2016 - Sept. 2017).
NTIS Issue Number	201822