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35 Figure 4-15. Longitudinal grooving machine. Figure 4-17. Close-up picture of longitudinal grooving (Section 7). Materials/Construction Quality Water-to-cement ratio. corresponding outputs) performed on the existing texture Slump. test sections. These included texture measurements with the Air content. CT Meter (ASTM E 2157) and the high-speed texture profiler, Air and mix temperatures. friction measurements with the DF Tester (ASTM E 1911) and Compressive strength (3- and 14-day). the locked-wheel tester (ASTM E 274), and measurements Initial smoothness (profilograph traces and zero for near-field SI noise, interior vehicle noise, and far-field blanking-band profile index [PI0.0] values for 0.1-mi CPB noise. [0.16-km] segments before and after grinding). CT Meter and DF Tester testing were performed at two dif- ferent time periods: the first during the week of July 23, 2007, Texture, Friction, and the second during the week of October 7, 2007. In gen- and Noise Test Procedures eral, the same testing protocols were followed, with repeat tests conducted in both the right wheelpath (24 in. [610 mm] Field Testing Protocol from lane edge) and lane center (72 in. [1,830 mm] from lane Measurement of texture, friction, and noise of the newly edge) of the test segment established within each test section. constructed sections was obtained using the same tests (and Although test segments on the South Extension were about half of the length of the segments representing existing tex- tures (528 ft versus 1,056 ft [161 m versus 322 m]), the same number of CT Meter and DF Tester tests were performed-- 15 each in the right wheelpath and lane center along the length of each test segment. Noise and high-speed texture were tested at various times between late July and early October, 2007. SI data were collected in accordance with AASHTO Provisional Standard TP076-08 (in draft form), which included a vertical dual probe configura- tion with the new ASTM Standard Reference Test Tire (SRTT) (see Figures 4-19 and 4-20). At least three test runs were made with the pairs of microphones simultaneously collecting front and rear SI data. The average of the front- and rear-measured SI values was then computed. Prior to formal SI testing, a comparison was made of the dual-probe/SRTT test method and the single-probe/Aquatred III method. Multiple test runs were made with each setup on Figure 4-16. Longitudinal grooved center lane two different test sections. The overall average difference in (Section 7). SI measurements was insignificant (0.1 dB(A)), thus no

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36 350+00 SB NB 265+75 340+00 338+00 337+00 333+22 330+00 326+56 163 Strd Overpass 322+55 2 5 322+92 321+25 32 320+00 0 0 Embank Em 313+90 3 0 3+9 Texture 10 310+00 0 0 Burlap Drag + Random Tran Tine Gouger Rd (307+00 to 312+28 OSL) (3 Overpass ass Texture 11 305+50 (Plaza Overhead Sign) 306+54 Burlap Drag + 1-in Tran Tine (ISTHA HA std) 305+06 305+ 303+30 (307+43 to 302+15 CL) 300+54 300+ 300+00 0 0 300+03 +03 Emban nkk 293+55 293 3 5 Embank Em Texture 2 167 th /Division No Pretexture + 0.75-in Long Tine St 290+00 0 0 290+57 290+ (300+03 to 294+75 OSL) Texture 9 Burlap Bur 287+57 Drag + 0.5-in Tran Tine (GA design) (286+00 to 291+28 OSL) 285+92 285 284+10 (Plaza Overhead Sign) 283+00 3+00 0 280+00 0 0 Texture 1a T Heavy Turf Drag (orig) (276+32 to 279+92 OSL) (276+3 272+92 72+92 Texture 5b Heavy Turf Drag + 0.75-in Long g Tine 270+00 0 0 (272+50 to 267+50 CL) 267+92 267+08 267+25 (Plaza Toll Toll Overhead Structure ) Plaza Plaza Figure 4-18a. Location of test sections on the test site north end.

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37 270+00 SB NB Toll 267+25 (Plaza Toll Overhead Structure) Plaza 266+08 Plaza 265+75 260+00 + Texture 1b b Heavy Turf Drag (mod) 0 OSL) (261+28 to 256+00 256+00 Texture 5a Std Turf Drag + 0.75-in Long ong Tine 250+42 (254+28 to 249+00 OSL) SL) 250+00 + 249+00 Texture 3 T 248+60 (Plaza Overhead Sign) 247+42 No Pretexture Pretex + Long Grind to 250+00 OSL) (244+72 t 241+97 240+93 240+00 + 240+08 Bruce Rd Overpass Emban ank 235+65 2 5 Embank Texture 6 232+42 Std Turf Drag + Shallow 0.75-in Long ong Tine (234+83 to 229+55 OSL) 230+00 0+ 229+42 Texture 7 Burlap Drag + Long Groove Em ba nk (227+11 to 232+39 CL) 224+93 224+00 222+20 (Plaza (Plaza O Overhead Sign) 220+00 + 220+00 (Plaza Overhead head Sign) 214+85 215+42 Texture 12 Std Turf Drag + Skewed Random Tine (new ISTHA std) (214+85 to 209+57 OSL) 210+00 + 211+08 Texture 8 Embank Std Turf Drag + Long Groove (201+96 to 207+24 OSL) Embank Em 200+00 + Pond Pon 195+65 5 (Pl P aza O Overhead Sign) 193+75 193+50 193+62 Spring 190+00 Creek Bridge Figure 4-18b. Location of test sections on the test site south end.