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From page 315... ... 315 a p p e N D I x U Introduction A survey of several concrete slabs constructed by the Texas A&M Transportation Institute (TTI) was carried out with a portable seismic property analyzer (PSPA) Read the entire page →
From page 316... ... 316 (a) IE method (b) Read the entire page →
From page 317... ... 317 the bottom of the deck and a flexural mode dominates the frequency response. In this case, Equation U.1 is not applicable to measure the depth of delamination because it is influenced by several factors. Read the entire page →
From page 318... ... 318 test results The USW and IE results from different concrete and shotcrete slabs are presented and compared in this section. A detailed description of the data reduction process was provided in a companion report related to testing in actual tunnels in Colorado and Virginia (see Appendix P) Read the entire page →
From page 320... ... 320 specimens, reflections from the vertical boundaries are apparent in the later portions of the signals. The PSPA software contains appropriate filters to minimize the effect of these reflections as long as the PSPA is located an adequate distance from the boundary. Read the entire page →
From page 321... ... 321 (b) Waveform obtained from PSPA at center point (c) Read the entire page →
From page 322... ... 322 PSPA was close to that measured with the traditional PSPA (Figure U.16b) Read the entire page →
From page 323... ... 323 0 0.5 1 1.5 2 2.5 3 x 10-3 -0.2 -0.15 -0.1 -0.05 0 0.05 0.1 0.15 Time (s) Read the entire page →
From page 324... ... 324 (a) Average modulus from USW (b) Read the entire page →
From page 325... ... 325 0.04 1st Receiver (e) USW B-scan along centerline (f) Read the entire page →
From page 327... ... 327 (b) Waveform obtained from PSPA at center point (c) Read the entire page →
From page 328... ... 328 (a) Average modulus from USW Longitudinal Distance from Center (in) Read the entire page →
From page 329... ... 329 (a) Average modulus from USW Longitudinal Distance from Center (in) Read the entire page →
From page 331... ... 331 (b) Dominant frequency from IE Longitudinal Distance from Center (in) Read the entire page →
From page 332... ... 332 (a) Average modulus from USW Longitudinal Distance from Center (in) Read the entire page →
From page 334... ... 334 (a) Slab view in 2011 (b) Read the entire page →
From page 335... ... 335 (a) Average modulus from USW Longitudinal Distance from Center (in) Read the entire page →
From page 336... ... 336 (c) Average modulus from USW Longitudinal Distance from Center (in) Read the entire page →
From page 337... ... 337 (b) Dominant frequency from IE Longitudinal Distance from Center (in) Read the entire page →
From page 338... ... 338 (a) Slab 1 Longitudinal Distance from Center (in) Read the entire page →
From page 339... ... 339 (c) Average modulus from USW Longitudinal Distance from Center (in) Read the entire page →
From page 340... ... 340 (a) Average modulus from USW Longitudinal Distance from Center (in) Read the entire page →
From page 341... ... 341 (a) Average modulus from USW Longitudinal Distance from Center (in) Read the entire page →
From page 342... ... 342 (c) Average modulus from USW Longitudinal Distance from Center (in) Read the entire page →
From page 343... ... 343 (a) Average modulus from USW Longitudinal Distance from Center (in) Read the entire page →
From page 344... ... 344 (c) Average modulus from USW Longitudinal Distance from Center (in) Read the entire page →
From page 345... ... 345 (a) Average modulus from USW (b) Read the entire page →
From page 346... ... 346 (a) Average modulus from USW Longitudinal Distance from Center (in) Read the entire page →
From page 347... ... 347 (c) Average modulus from USW Longitudinal Distance from Center (in) Read the entire page →
From page 348... ... 348 (c) Average modulus from USW Longitudinal Distance from Center (in) Read the entire page →
From page 349... ... 349 (a) Average modulus from USW Longitudinal Distance from Center (in) Read the entire page →
From page 350... ... 350 Figure U.41. (Continued.) Read the entire page →
From page 351... ... 351 (c) Average modulus from USW Longitudinal Distance from Center (in) Read the entire page →
From page 352... ... 352 (c) Average modulus from USW Longitudinal Distance from Center (in) Read the entire page →
From page 353... ... 353 Figure U.44. (Continued.) Read the entire page →
From page 355... ... 355 De pt h (in .) Read the entire page →
From page 356... ... 356 (a) Slab 4 (air void at 7.5-inch depth) Read the entire page →
From page 357... ... 357 (g) Slab 10 (delamination at 3-inch depth) Read the entire page →

From page 315...

... 315 a p p e N D I x U Introduction A survey of several concrete slabs constructed by the Texas A&M Transportation Institute (TTI) was carried out with a portable seismic property analyzer (PSPA)