(d) Reflection data extracted from GPR measurements at a certain location (Location A) of an asphalt concrete (AC) pavement is shown below. The thickness of the core extracted from the Location A, where the GPR data was collected, is 18.7cm. During the same GPR survey, the amplitude of the signal surface reflection at another location (Location B) is 12,000, and the two-way GPR signal travel time within the AC wearing course is 3.012 ns. Calculate the AC wearing course thickness at Location B. 14000 12000 (4.266, 11400) AC 10000 8000 Pavement Data 6000 Base (7.162, 4556) 4000 2000 0 56769 1011 12 13 14 15 16 17 18 19 2021 Subgrade -2000 -4000 Amplitude AAN

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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Question A2 (continued)
(d) Reflection data extracted from GPR measurements at a certain location (Location A) of an asphalt
concrete (AC) pavement is shown below. The thickness of the core extracted from the Location A,
where the GPR data was collected, is 18.7cm. During the same GPR survey, the amplitude of the
signal surface reflection at another location (Location B) is 12,000, and the two-way GPR signal
travel time within the AC wearing course is 3.012 ns. Calculate the AC wearing course thickness at
Location B.
14000
12000
(4.266, 11400)
AC
10000
8000
Pavement Data
6000
Base
(7.162, 4556)
4000
2000
0
Subgrade
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18192021
-2000
-4000
-6000
-8000
Time (ns)
Equations which might be useful:
C
A₂ + 40²
ε₁ = (- °)² v=
Ap-A
P
- Je
Amplitude
Transcribed Image Text:Question A2 (continued) (d) Reflection data extracted from GPR measurements at a certain location (Location A) of an asphalt concrete (AC) pavement is shown below. The thickness of the core extracted from the Location A, where the GPR data was collected, is 18.7cm. During the same GPR survey, the amplitude of the signal surface reflection at another location (Location B) is 12,000, and the two-way GPR signal travel time within the AC wearing course is 3.012 ns. Calculate the AC wearing course thickness at Location B. 14000 12000 (4.266, 11400) AC 10000 8000 Pavement Data 6000 Base (7.162, 4556) 4000 2000 0 Subgrade 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18192021 -2000 -4000 -6000 -8000 Time (ns) Equations which might be useful: C A₂ + 40² ε₁ = (- °)² v= Ap-A P - Je Amplitude
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