controlled 5-axle truck with 80-kip total weight loading one lane and 102-kip total weight loading the other lane. Figure 11: Layout of test at the MnROAD facility. (Adapted from: , February 20th, 2009) Cell 93 Cell 94 Cell 95 Cell 96 Cell 97 Cell 92 Cell 60 Cell 61 Cell 62 Cell 63 4 in 3 in 3 in 6 in 6 in 6 in 5 in sealed 5 in no seal 4 in sealed 4 in no seal 10 in 58-28 1993 HMA 10 in 58-28 1993 HMA 9 in 58-28 1993 HMA 8 in 58-28 1993 HMA 8 in 58-28 1993 HMA 7 in 58-28 1993 HMA 7 in 58-28 1993 HMA 7 in 58-28 1993 HMA 7 in 58-28 1993 HMA 7 in 58-28 1993 HMA Clay Clay Clay Clay Clay Clay Clay Clay Clay Clay Trans Tined 4-ft x 4-ft Panel Trans Tined 4-ft x 4-ft Trans Tined 5-ft x 6-ft Panel Polyolefin Trans Tined 5-ft x 6-ft Panel Trans Tined 10-ft x Panel Trans Tined 10-ft x Panel 1-in dowel Turf 5-ft x 6-ft Panel Turf 5-ft x 6-ft Panel Turf 5-ft x 6-ft Turf 5-ft x 6-ft Panel Oct-97 Oct-97 Oct-97 Oct-97 Oct-97 Oct-97 Oct-04 Oct-04 Oct-04 Oct-04 Oct-04 Oct-04 Oct-04 Current Current Current Current Current Current Current Figure 12: Test cells constructed during Oct 1997 and 2004. (Adapted from: , February 20th, 2009) Cell 14 SC* 114 SC* 214 SC* 314 SC* 414 SC* 514 SC* 614 SC* 714 SC* 814 SC* 914 ft ft
projects is summarized in the tables below. All three projects are comparatively new. Cores were pulled and the thicknesses of the HMA and the overlays are given in the through along with the shear strength at the interface, which was measured using the Iowa shear test. No visible distresses have been observed after five to six years of service. 22: Layer properties for the project at MO-5, railroad crossing in Lebanon. Route Direction Location PCC overlay thickness (in) HMA thickness (in) Iowa shear strength (psi) Unit weight of PCC (lb/ft3) MO-5 Left turn lane 0+22 4.5 7 Debonded 139 MO-5 Left turn lane 0+44 4.5 7 148 139 MO-5 Left turn lane 1+44 4.8 7 Debonded 139 MO-5 Left turn lane 1+84 4.4 7 Debonded 136 Table 23: Layer properties for the project at BUS-13 in Branson West. Route Direction Location PCC overlay thickness (in) HMA thickness (in) Iowa strength (psi) Unit weight of PCC (lb/ft3) BUS- 13 NB 0+37 5.6 7 150 141 BUS-13 NB 0+88 4.4 7 18 141 BUS-13 NB 1+28 5.4 7.0 415 139 BUS-13 SB 0+52 5.9 7.0 Debonded 139 BUS-13 SB 1+00 4.6 7.0 213 139 BUS-13 SB 1+40 5.2 7.0 246 138 NB: Northbound , SB: Southbound Table 24: Layer properties for the project at the Intersection of BUS-13 and MO-14. Route PCC overlay thickness (in) HMA thickness (in) Iowa shear strength (psi) Unit weight of PCC (lb/ft3)
State Roadway HMA thickness, (in) Overlay thickness- panel size (in:ftxft) Bond shear strength (psi) Observed distress Minnesota TH-30 (35 miles southwest of Mankato) TS:5 5.25 to 9.75 6:12x12 N/A Very low faulting; low spalling. TH-30 (35 southwest of Mankato) TS:6 5.25 to 9.75 6:12x12 N/A Very low faulting; low spalling. TH-30 (35 southwest of Mankato) Control section 5.25 to 9.75 6:12x12 N/A Long. cracks, very low faulting. Pennsylvania Intersection of SR-133 and SR-100, Chester County 10 4:4x4 N/A N/A SR-30, Lancaster County 11.5 3:3x3 N/A N/A SR-8031(Segment 0510) and ramp to SR-0083) 3.5 2:3x3 N/A N/A SR-30, Uniontown, Fayette County 8 4:4x4 N/A 1 corner Spalling in a few trans. jts. Texas Intersections on LP-250 at Wadley Road, Holiday Hill Road and Midland Drive 4 3:3x3 N/A Corner and trans. cracks. Intersection of LP-250 at Midkiff Road and Garfield Road 4 3:3x3 N/A Corner and trans. cracks. Missouri Intersection of SR-291 and SR-78, Independence 3 to 8 4:4x4 Min.: 43 Max.: 137 Ave.: 90 Stan. dev.: 66 n = 2 1.7 % of slabs cracked. Table : Summary of projects evaluated (continued).
State Roadway HMA thickness, (in) Overlay thickness- size (in:ftxft) Bond shear strength (psi) Observed distress Missouri US-60, between US-71 and BUS-71, near Neosho 4.5 4:4x4 Min.: 49 Max.: 158 Ave.: 109 Stan. dev.: 41 n = 9 Corner and cracks in 2.2 % of the panels. US-169 and SR-YY intersection, St. Joseph 10 to 11 4:3x3 Min.: 31 Max.: 31 Ave.: 31 Stan. dev.: 0 n = 1 Corner and cracks in 3 % of the panels. MO-5, railroad crossing, Lebanon 7 4:N/A Min.: 148 Max.: 148 Ave.: 148 Stan. dev.: 0 n = 1 No distress BUS-13, Branson West 7 4.4 to 5.9:N/A Min.: 18 Max.: 415 Ave.: 208 Stan. dev.: 145 n = 5 No distress Intersection of BUS-13 and MO-14 4 4.2 to 5.3:N/A Min.: 18 Max.: 87 Ave.: 59 Stan. dev.: 36 n = 3 No distress 46: Summary of projects evaluated (continued).