concrete overlays in texas - texas a&m university · concrete overlays in texas 90th annual...
TRANSCRIPT
![Page 1: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/1.jpg)
Concrete Overlays in Texas
90th Annual Transportation Short CourseOctober 12, 2016
Moon Won, P.E.Texas Tech University
1
![Page 2: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/2.jpg)
Presentation Overview
• Concrete Pavement in Texas
• Overview of Concrete Overlays in Texas
• Performance of Concrete Overlays in Texas
• Current Efforts to Improve Concrete Overlays
• Summary
2
![Page 3: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/3.jpg)
PCC Pavement in Texas
0
1,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000
11,000
12,000
13,000
14,000
19
92
19
93
19
94
19
95
19
96
19
97
19
98
19
99
20
00
20
01
20
02
20
03
20
04
20
05
20
06
20
07
20
08
20
09
20
10
20
11
20
12
20
13
20
14
Lan
e M
iles
[mile
]
CRCP
CPCD
3TxDOT PMIS
![Page 4: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/4.jpg)
General Concept in Current Overlay Type
Selection
4
Helga N. Torres., et al., Guide to the Design of Concrete Overlays Using Existing
Methodologies, DTFH61-06-H-00011 (Work Plan 13), National Concrete Pavement
Technology Center Institute for Transportation, Iowa State University, 2012
![Page 5: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/5.jpg)
Overview of Concrete Overlays in Texas
• Overlay Structures
– CPCD on CPCD
– CRCP on CRCP
– Thin PCP on CRCP
– CRCP on CPCD
• Overlay Thickness: 2-in to 12-in
• Interface
– Bonded
– Unbonded
5
![Page 6: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/6.jpg)
Overview of Concrete Overlays in Texas
6
Highway/Location ExistingPavement
Overlay Type Overlay Construction
Performance
Loop 610S/Houston
8-in CRCP 2-in & 3-in BCO 1983 Satisfactory
Loop 610N/Houston
8-in CRCP 4-in BCO 1986 Excellent
IH 35/Denton 10-in CPCD 11-in CPCD 1988 Satisfactory
IH 35E/Waxahachie 10-in CPCD 10-in CPCD 1990 Excellent
IH 10/Beaumont 10-in CPCD 12-in CPCD 1994 Excellent
IH 10/El Paso 8-in CRCP 6.5-in CRCP 1996 Mixed
SH 146/Baytown 8-in CRCP 3-in BCO 1998 Early Failure
US 281/Wichita Falls 8-in CRCP 4-in CRCP 2002 Excellent
US 75/Sherman 10-in CPCD 7-in CRCP 2010 Mixed
US 287/Bowie 8-in CRCP 4-in CRCP 2012 Premature Failure
![Page 7: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/7.jpg)
Performance of Concrete Overlays in Texas
• Loop 610 South in Houston
• IH 35 in Denton
• IH 35 E in Waxahachie
• SH 146 in Baytown
• US 281 in Wichita Falls
• US 75 in Sherman
• US 287 in Bowie
7
![Page 8: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/8.jpg)
1. S Loop 610 EB in Houston
Limits: From Doolittle Blvd to Calais Rd
Harris County
Completed in 1983
2-in & 3-in BCO
8-in existing CRCP
![Page 9: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/9.jpg)
![Page 10: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/10.jpg)
![Page 11: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/11.jpg)
11
IH 35 NB_Denton
33.324244, -97.180385
CSJ: 0195-02-035
Denton County
Completed in 1988
11-in CPCD Overlay
220#/SY ACP Level Up
10-in existing CPCD
2. IH 35 in Denton
![Page 12: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/12.jpg)
1960 Typical Section (DAL-IH 35 - 0195-02-016)
1987 Typical Section (DAL-IH 35 - 0195-02-035)
6-in Roadbed Treatment
6-in Roadbed Treatment (Type B)
Existing 10-in CPCD
10-in CPCD
11-in CPCD
![Page 13: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/13.jpg)
13
![Page 14: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/14.jpg)
03/23/2012 02/20/2016
14
![Page 15: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/15.jpg)
0
10
20
30
40
50
60
70
80
90
100
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0
15
30
45
60
75
90
10
5
12
0
13
5
15
0
16
5
18
0
19
5
21
0
22
5
24
0
25
5
27
0
28
5
30
0
Load
Tra
nsf
er
Effi
cie
ncy
Def
lect
ion
@9
,00
0lb
s [m
ils]
Distance [ft]
Average Deflection (D1)
Average LTE
Deflection Testing
![Page 16: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/16.jpg)
y = -3.61ln(x) + 10.888R² = 0.9704
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
7 8 9 10 11 12 13 14 15 16
Ave
rage
De
fle
ctio
n [
mil
s]
Slab Thickness [in]
Statewide Average Deflection
16
![Page 17: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/17.jpg)
Ellis County
Completed in 1990
10-in CPCD Slab
1.4-in ACP
10-in existing CPCD
3. IH 35E in Waxahachie
![Page 18: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/18.jpg)
Pavement Structure (from LTPP database)
18
![Page 19: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/19.jpg)
![Page 20: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/20.jpg)
Deflection Testing
0
10
20
30
40
50
60
70
80
90
100
0
1
2
3
4
50
15
30
45
60
75
90
10
5
12
0
13
5
15
0
16
5
18
0
19
5
21
0
22
5
24
0
25
5
27
0
28
5
30
0
Load
Tra
nsf
er
Effi
cie
ncy
Def
lect
ion
@9
,00
0lb
s
Distance [ft]
Average Deflection (D1)Average LTE
![Page 21: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/21.jpg)
![Page 22: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/22.jpg)
CSJ: 0389-13-XXX
Harris County
3-in BCO (built in 1998) + 8-in existing CRCP
3-in BCO
8-in existing CRCP
4. SH 146 in Baytown
![Page 23: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/23.jpg)
23
![Page 24: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/24.jpg)
24
![Page 25: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/25.jpg)
CSJ: 0249-01-XXX
Wichita County
4-in BCO (built in 2002) + 8-in existing CRCP (built in 1969, CSJ: 0249-01-012)
4-in BCO
8-in existing CRCP
5. US 281 in Wichita Falls
![Page 26: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/26.jpg)
![Page 27: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/27.jpg)
![Page 28: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/28.jpg)
![Page 29: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/29.jpg)
29
![Page 30: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/30.jpg)
FWD
3.00
3.50
4.00
4.50
5.00
5.50
6.00
Near the Construction Joint Deflection Data
![Page 31: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/31.jpg)
FWD
3.00
3.50
4.00
4.50
5.00
5.50
6.00
Near the Construction Joint Deflection Data
![Page 32: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/32.jpg)
FWD
3.00
3.50
4.00
4.50
5.00
5.50
6.00
Near the Construction Joint Deflection Data
![Page 33: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/33.jpg)
FWD
3.00
3.50
4.00
4.50
5.00
5.50
6.00
Near the Construction Joint Deflection Data
![Page 34: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/34.jpg)
FWD
3.00
3.50
4.00
4.50
5.00
5.50
6.00
Near the Construction Joint Deflection Data
![Page 35: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/35.jpg)
• From Travis Street in Sherman to FM 84
6. US 75 in Sherman
![Page 36: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/36.jpg)
36
![Page 37: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/37.jpg)
0
10
20
30
40
50
60
-
0.5
1.0
1.5
2.0
2.5
3.0
0 10 20 30 40 50 60 70 80 90 100 110 120
CP
CD
Def
lect
ion
@ 9
,00
0 lb
s [m
ils]
BC
O D
efle
ctio
n @
9,0
00
lbs
[mils
]
Joint #
CRCP (Mid Slab)CPCD (Joint-Mid Slab-Joint)
Distress PCP
CJ (J-45)
Morning Section
J-31 J-76, 80, 86, 92, 93, 95, 96, 99, 101, 102, 104, 106, 107,110, 111, 112, 113, 114, 115, 116
J-56
Afternoon Section
Deflection (BCO vs CPCD) vs Distress
37
![Page 38: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/38.jpg)
-
2
4
6
8
10
12
14
0-20 21-40 41-60 61-80 81-100 101-120
BC
O D
efle
ctio
n @
9,0
00 lb
s [m
ils]
Range of Joint #
Frequency [N]
101 102 103 104 105
106 107 108 109 110
111 112 113 114 115
116 117 118 119 120
US75 - South – Start at Exit 64
U M D U M D U M D U M D A B B
M D A A B A B U M D A B C
U M D U M D U M D U M D U M D
A B C D B C DA B C DA A B C A B B C C
Joint 101-120Nu
mb
er
of
Dis
tre
ss [
N]
Distress Distribution
Joint #
-
2
4
6
8
10
12
14
0-20 21-40 41-60 61-80 81-100 101-120
BC
O D
efle
ctio
n @
9,0
00 lb
s [m
ils]
Range of Joint #
Frequency [N]
101 102 103 104 105
106 107 108 109 110
111 112 113 114 115
116 117 118 119 120
US75 - South – Start at Exit 64
U M D U M D U M D U M D A B B
M D A A B A B U M D A B C
U M D U M D U M D U M D U M D
A B C D B C DA B C DA A B C A B B C C
Joint 101-120Nu
mb
er
of
Dis
tre
ss [
N]
Joint #38
![Page 39: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/39.jpg)
J-111J-110
39
![Page 40: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/40.jpg)
CSJ: 0013-005-XXX
Montague County
Overlaid with AC + 4-in BCO (built in Nov, 2012) + 8-in existing CRCP (built in 1972, CSJ 0013-005-017)
Overlaid with AC
4-in BCO
8-in existing CRCP
7. US 287 in Bowie
![Page 41: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/41.jpg)
N 33˚ 30’ 04.53” W 97˚ 48’ 31.37”
Condition of Existing CRCP
41
![Page 42: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/42.jpg)
0
5
10
15
20
25
30
35
10
50
90
13
0
17
0
21
0
25
0
29
0
33
0
37
0
41
0
45
0
49
0
53
0
57
0
61
0
65
0
69
0
73
0
77
0
81
0
85
0
89
0
93
0
97
0
Def
lect
ion
@ 9
,00
0 lb
s
Distance [ft]
FWD deflection
42
![Page 43: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/43.jpg)
y = -3.61ln(x) + 10.888R² = 0.9704
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
7 8 9 10 11 12 13 14 15 16
Ave
rage
Def
lect
ion
[m
ils]
Slab Thickness [in]
Statewide Average Deflection
43
![Page 44: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/44.jpg)
12/03/2010 04/25/2012
08/13/2013
44
![Page 45: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/45.jpg)
STEP 3. Testing Device Setup STEP 4. Loading and Pull-Out
STEP 1. D=2-in Coring STEP 2. Disk Attachment
45
![Page 46: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/46.jpg)
Schematic of Pull-Off Test
46
![Page 47: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/47.jpg)
AREA
D1 D2 D3 D4 AVE. D [in2] [kN] [lb] [psi] [Mpa] N W
#1 1.99 1.99 1.989 1.988 1.989 3.11 N 33 29 45.27 W 97 48 18.65
#2 1.977 1.977 1.967 1.97 1.973 3.06 2.35 528 173 1.2
#3 1.976 1.985 1.971 1.971 1.976 3.07 1.60 360 117 0.8
#4 1.957 1.969 1.983 1.966 1.969 3.04 2.60 585 192 1.3
#5 1.989 1.98 1.983 1.98 1.983 3.09
#6 1.975 1.969 1.979 1.983 1.977 3.07
#7 1.978 1.974 1.978 1.985 1.979 3.08 2.50 562 183 1.3
#8 1.982 1.985 1.978 1.976 1.980 3.08 1.70 382 124 0.9
#9 1.963 1.962 1.972 1.979 1.969 3.04 2.70 607 199 1.4
#10 1.984 1.976 1.979 1.974 1.978 3.07 3.20 719 234 1.6
#11 1.992 1.986 1.978 1.968 1.981 3.08 3.10 697 226 1.6
#12 1.984 1.987 1.974 1.975 1.980 3.08 3.30 742 241 1.7
#13 1.983 1.987 1.98 1.976 1.982 3.08 2.30 517 168 1.2
#14 1.969 1.985 1.98 1.985 1.980 3.08 2.60 585 190 1.3 N 33 26 26.30 W 97 45 55.35
Standard Deviation, SD [psi] 40
Coefficient of Variation, COV [%] 22%
Base Broken [%] 7%
Analyzed Sample [%] 79%
Average Bond Strength [psi] 186
GPS Coordinates
FAILURE
BASE BROKEN
FAILURE
Failure [%] 14%
Test #Diameter of Core Specimen Load Bond Strength
Bond Strength Test Results
186 psi47
![Page 48: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/48.jpg)
48
![Page 49: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/49.jpg)
Current Efforts to Improve Concrete Overlays
• Research Project 0-6910
49
![Page 50: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/50.jpg)
General Concept in Current Overlay Type
Selection
50
Helga N. Torres., et al., Guide to the Design of Concrete Overlays Using Existing
Methodologies, DTFH61-06-H-00011 (Work Plan 13), National Concrete Pavement
Technology Center Institute for Transportation, Iowa State University, 2012
![Page 51: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/51.jpg)
Current Efforts to Improve Concrete Overlays
• Research Project 0-6910
• Threshold values for BCO/UBCO
• Improved design procedures
– AASHTO UBCO too conservative
• Construction specifications
51
![Page 52: Concrete Overlays in Texas - Texas A&M University · Concrete Overlays in Texas 90th Annual Transportation Short Course October 12, 2016 Moon Won, P.E. Texas Tech University 1](https://reader035.vdocuments.mx/reader035/viewer/2022071010/5fc8131b143f6a0fc77fc2f3/html5/thumbnails/52.jpg)
Summary
• TxDOT has many miles of PCC pavement that
already exceeded or are approaching design lives.
• Concrete overlays could provide a cost-effective
rehabilitation method.
• Overall, the performance of concrete overlays in
Texas has been quite satisfactory, with some
exceptions.
• Efforts are underway to further improve PCC
overlay design/construction practices.
52