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

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Light weight deflectometer tests were carried out at six different locations over the prepared subgrade using three different loading plates of 10, 20, and 30 cm in diameter, as described in section 3.6.8. These tests were carried out to determine the dynamic deformation modulus of the subgrade in each test section. After the preparation of subgrade, a geotextile layer was placed at the interface between the subgrade and the base course in the geocell-reinforced RAP base sections. In the unreinforced RAP base sections, no geotextile was placed at the interface between the subgrade and the base. 4.1.2 RAP Base Course The base material used in all the experiments was RAP. The nominal thicknesses of the RAP base courses adopted in the tests were 15, 23, and 30 cm, respectively. No test was done for a 23 cm thick unreinforced base section. In the geocell-reinforced test sections, the geocell was installed over the geotextile placed on the top of the subgrade. The plan view and actual installation of the geocell over the subgrade with the geotextile are shown in figures 4.1 and 4.2. In the 15 cm thick geocell-reinforced RAP base section, one layer of 10 cm high geocell infilled with RAP was installed with a 5 cm thick RAP cover. In the 30 cm thick geocell-reinforced RAP base section, two layers of geocells (10 cm high), infilled with RAP, were installed, and the RAP covers on the bottom and upper geocells were 3 and 7 cm thick. In the 23 cm thick geocell- reinforced RAP base section, one layer of 15 cm high geocell infilled with RAP was installed with an 8 cm thick RAP cover. The total numbers of strain gauges fixed on the wall of the geocell were six, six and 12 (six on each layer) for the 15 cm, 23 cm, and 30 cm thick RAP base courses. 44
The quantity of RAP placed in each lift was calculated by multiplying the volume of that lift by the density of RAP. The RAP was compacted at the moisture content of 5.5%, which corresponded to 95 % of the maximum dry density. The lift thickness depended on the base thickness. The 15 cm thick unreinforced RAP base was compacted in two lifts (8 cm for the first lift and 7 cm for the second lift). The 30 cm thick unreinforced RAP base was compacted in three lifts (10 cm each lift). Both unreinforced base courses were compacted by the vibratory plate compactor. For the 15 and 23 cm thick geocell-reinforced RAP base courses, the infill RAP in one layer of geocell was placed and compacted by hand tamping using the Proctor hammer and the RAP cover was compacted by the vibratory plate compactor. For the 30 cm thick geocell-reinforced RAP base course, RAP was placed and compacted in four lifts, which included the bottom 10 cm thick geocell-reinforced RAP layer, the 3 cm thick RAP cover, the upper 10 cm thick geocell-reinforced RAP layer, and the 7 cm RAP. The infill RAP inside the geocell was placed and compacted by hand tamping using the Proctor hammer and the RAP cover was compacted by the vibratory plate compactor. The symbols, orientations, and locations of strain gauges affixed on geocell wall are shown in figure 4.3. 45
Page 1 and 2:
Report # MATC-KU: 462 Final Report
Page 3 and 4:
Technical Report Documentation Page
Page 5 and 6:
4.3.4 15 cm Thick Geocell-Reinforce
Page 7 and 8:
Figure 4.11 Profiles of the HMA sur
Page 9 and 10: Figure 4.48 The permanent deformati
Page 11 and 12: List of Tables Table 2.1 Percentage
Page 13 and 14: Acknowledgements This research was
Page 15 and 16: Abstract Asphalt pavements deterior
Page 17 and 18: 1.1 Background Chapter 1 Introducti
Page 19 and 20: On-site use of RAP materials has re
Page 21 and 22: Chapter 2 Literature Review Recycle
Page 23 and 24: Protection. Geosynthetics are somet
Page 25 and 26: wet weather conditions. Webster and
Page 27 and 28: subgrade can be improved in terms o
Page 29 and 30: annually in the early 1990s (FHWA-H
Page 31 and 32: Figure 2.2 Usage and potential of v
Page 33 and 34: Table 2.1 Percentage of use of RAP
Page 35 and 36: Type of Property Physical Propertie
Page 37 and 38: permeability values. The addition o
Page 39 and 40: Chapter 3 Material Properties and E
Page 41 and 42: Table 3.1 Properties of the RAP bas
Page 43 and 44: 3.3 Asphalt Concrete Figure 3.4 Sta
Page 45 and 46: Table 3.2 Basic Properties of NPA g
Page 47 and 48: Earth pressure cells were installed
Page 49 and 50: central pocket, and one at the top
Page 51 and 52: plate on one end was buried at the
Page 53 and 54: loading plate to simulate the rubbe
Page 55 and 56: 3.6.7 Dynamic Cone Penetration Test
Page 57 and 58: Figure 3.15 Light weight deflectome
Page 59: Chapter 4 Experimental Data Analysi
Page 63 and 64: Geocell infilled with RAP Geocell i
Page 65 and 66: Figure 4.4 Prime coat on the RAP ba
Page 67 and 68: 4.2 Cyclic Plate Load Tests Figure
Page 69 and 70: dynamic deformation moduli from LWD
Page 71 and 72: Depth (cm.) 0.00 5.00 10.00 15.00 2
Page 73 and 74: Depth (cm.) 10 14 18 22 26 Before t
Page 75 and 76: surface at the center was under ten
Page 77 and 78: 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 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 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 and 130:
Vertical stress (kPa) 250 200 150 1
Page 131 and 132:
Stress distribution angle ( ̊) 80
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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