Onsite Use of Recycled Asphalt Pavement Materials and Geocells to ...

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Verticla stress (kPa) 180 140 100 60 20 -20 0 10 20 30 40 50 60 70 80 Figure 4.72 Distribution of the vertical stresses at the interface between subgrade and RAP base versus the number of loading cycles at 25 mm surface permanent deformation at the center 4.4.10 Stress Distribution Angle Distance from center (cm.) Figure 4.73 shows the stress distribution angles decreased with an increase of the number of loading cycles. The geocell-reinforced base sections had the higher stress distribution angles than the unreinforced base sections. This result demonstrates the benefit of geocell confinement in increasing the stiffness of the base courses so that the stress distribution angles were enlarged. 114 15 cm unreinforced 30 cm unreinforced 15 cm reinforced (hard subgrade) 15 cm reinforced 23 cm reinforced 30 cm reinforced
Stress distribution angle ( ̊) 80 60 40 20 0 0 2000 4000 6000 8000 10000 12000 14000 16000 Figure 4.73 Stress distribution angle versus the number of loading cycles 4.5 Summary of Results The geocell confinement, the increase of base thickness, and the increase of subgrade CBR significantly improved the performance of the pavement. The geocell-reinforced RAP bases behaved like semi-rigid mattresses, which resulted in the distribution of the vertical stresses to wider areas. The geocell-reinforced RAP bases had a higher percent of elastic deformation, lower compression of HMA and RAP base, and more compression contributed by subgrade as compared with unreinforced RAP base sections. 15 cm unreinforced 15 cm reinforced (hard subgrade) 15 cm reinforced 23 cm reinforced 30 cm unreinforced 30 cm reinforced Number of loading cycle 115
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Report # MATC-KU: 462 Final Report
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Technical Report Documentation Page
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4.3.4 15 cm Thick Geocell-Reinforce
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Figure 4.11 Profiles of the HMA sur
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Figure 4.48 The permanent deformati
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List of Tables Table 2.1 Percentage
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Acknowledgements This research was
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Abstract Asphalt pavements deterior
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1.1 Background Chapter 1 Introducti
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On-site use of RAP materials has re
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Chapter 2 Literature Review Recycle
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Protection. Geosynthetics are somet
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wet weather conditions. Webster and
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subgrade can be improved in terms o
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annually in the early 1990s (FHWA-H
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Figure 2.2 Usage and potential of v
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Table 2.1 Percentage of use of RAP
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Type of Property Physical Propertie
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permeability values. The addition o
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Chapter 3 Material Properties and E
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Table 3.1 Properties of the RAP bas
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3.3 Asphalt Concrete Figure 3.4 Sta
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Table 3.2 Basic Properties of NPA g
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Earth pressure cells were installed
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central pocket, and one at the top
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plate on one end was buried at the
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loading plate to simulate the rubbe
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3.6.7 Dynamic Cone Penetration Test
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Figure 3.15 Light weight deflectome
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Chapter 4 Experimental Data Analysi
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The quantity of RAP placed in each
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Geocell infilled with RAP Geocell i
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Figure 4.4 Prime coat on the RAP ba
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4.2 Cyclic Plate Load Tests Figure
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dynamic deformation moduli from LWD
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Depth (cm.) 0.00 5.00 10.00 15.00 2
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Depth (cm.) 10 14 18 22 26 Before t
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surface at the center was under ten
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4.3.3 15 cm Thick Geocell-Reinforce
Page 79 and 80: Depth (cm.) 0 10 20 30 40 50 60 0 5
Page 81 and 82: The permanent deformation was obtai
Page 83 and 84: Strain on geocell (%) Figure 4.23 T
Page 85 and 86: Stress distribution angle (°) 50 4
Page 87 and 88: Figure 4.28 The calculated dynamic
Page 89 and 90: Elastic deformation (mm.) 3 2.5 2 1
Page 91 and 92: Strain (%) 0.15 0.1 0.05 0 -0.05 -0
Page 93 and 94: 4.3.5 23 cm Thick Geocell-Reinforce
Page 95 and 96: The profiles of the HMA surfaces as
Page 97 and 98: Figure 4.41 shows the measured maxi
Page 99 and 100: Figure 4.43 The vertical stress at
Page 101 and 102: Table 4.5 The average CBR values of
Page 103 and 104: at the distances of 25 and 50 cm aw
Page 105 and 106: Strain (%) 0.014 0.012 0.01 0.008 0
Page 107 and 108: 4.3.7 30 cm Thick Geocell-Reinforce
Page 109 and 110: The profiles of the HMA surfaces as
Page 111 and 112: Figures 4.58 and 4.59 show the meas
Page 113 and 114: Strain (%) 0.04 0.02 0 -0.02 -0.04
Page 115 and 116: 4.4 Analysis of Test Data Six cycli
Page 117 and 118: Table 4.7 Average CBR values of tes
Page 119 and 120: The percentages of air void of the
Page 121 and 122: Table 4.10 Number of loading cycles
Page 123 and 124: Table 4.11 Elastic deformation and
Page 125 and 126: HMA surface compression (mm.) Base
Page 127 and 128: strain was higher for the geocell a
Page 129: Vertical stress (kPa) 250 200 150 1
Page 133 and 134: 6. The subgrade contributed to most
Page 135 and 136: Berthelot, C., R. Haichert, D. Podb
Page 137: Pokharel, S. K., J. Han, D. Leshchi
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Onsite Use of Recycled Asphalt Pavement Materials and Geocells to ...

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