Cracking of continuously reinforced concrete pavement based on large-scale model test
Ya-ting ZHANG1(),Roesler Jeffery2
1. School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China 2. Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, IL 61801, USA
A large-scale model, continuously reinforced concrete beam (CRCB), was built to analyze the sensitivity of the transverse crack properties for variations in concrete material, reinforcement ratio and the use of macro fibers and active crack control, in order to control the transverse cracks in continuously reinforced concrete pavement (CRCP). An analytical method to calculate crack spacing and width was established to quantify the impact of the parameters. Results show that the analytical results are consistent with the field measured results, indicating the feasibility of the proposed analytical model. Transverse cracks developed with time and became stable after approximately 19-month construction. Steel content has significant effect on transverse cracks with approximately 17% reduction in both crack spacing and width in the test beam using #7 bar with diameter of 22.23 mm, compared to the test beam with #6 bar of 19.05 mm diameter. Lightweight concrete has potential to reduce punchout since it produces higher crack spacing and smaller crack width. With fibers and active crack control, the test beam shows larger crack spacing and less crack width.
Ya-ting ZHANG,Roesler Jeffery. Cracking of continuously reinforced concrete pavement based on large-scale model test. Journal of ZheJiang University (Engineering Science), 2020, 54(6): 1194-1201.
Fig.1Overview of continuously reinforced concrete beam (CRCB)
工况
混凝土材料
ρ/%
横向预切缝
1A
轻质
0.76
有
1B
轻质
0.76
无
1C
普通
0.76
无
1D
普通
0.76
有
2A
轻质+纤维
0.56
有
2B
轻质
0.56
无
2C
普通
0.56
无
2D
普通+纤维
0.56
有
Tab.1Details for all sections in continuously reinforced concrete beam （CRCB）
Fig.2Cross section of CRCB
Fig.3Field condition of CRCB
Fig.4Transverse crack map after 14-day construction
m
工况
t =14 d
t =182 d
t =569 d
t =917 d
CS
CW
CS
CW
CS
CW
CS
CW
1A
?
<0.10
1.89
<0.10
1.43
0.11
0.98
0.10
1B
8.23
<0.10
1.37
<0.10
0.94
0.10
0.76
0.10
1C
3.26
<0.10
1.07
<0.10
0.73
0.11
0.70
0.13
1D
2.56
<0.10
1.40
<0.10
0.88
0.11
0.88
0.13
2A
5.39
<0.10
1.77
<0.10
1.22
0.12
1.16
0.13
2B
6.80
<0.10
1.77
<0.10
1.16
0.23
1.25
0.15
2C
3.26
<0.10
1.22
<0.10
0.88
0.14
0.82
0.12
2D
2.65
<0.10
1.28
<0.10
1.10
0.11
1.10
0.11
Tab.2Average crack spacing and crack width in different beam sections and at different ages
Fig.5Number of transverse cracks with different beam ages
Fig.6Analytical model for CRCB
Fig.7Force distribution in CRCB
CRCB设计参数
E / GPa
Rm / MPa
σbc / MPa
εsh / 10?6
α / (10?6·°C?1)
hc / cm
ρ / %
kc / (MPa·m?1)
ks / (GPa·m?1)
ds /mm
b / cm
Δt / °C
普通混凝土
28.1
3.62
51.52
700
10
26.67
?
40
?
?
?
32
轻质混凝土
27.2
3.43
50.9
550
10
26.67
?
40
?
?
?
32
普通纤维混凝土
27.9
4.13
52.57
700
10
26.67
?
40
?
?
?
32
轻质纤维混凝土
26.4
4.34
48.37
550
10
26.67
?
40
?
?
?
32
#6钢筋
210
550
?
?
9
?
0.56
?
50
19.05
18.42
?
#7钢筋
210
550
?
?
9
?
0.76
?
50
22.23
18.10
?
Tab.3Inputs for concrete and steel in the analytical model
Fig.8Crack spacing and width for virgin concrete with reinforcement ratio of 0.56%
Fig.9Crack spacing and width for virgin concrete with reinforcement ratio of 0.76%
Fig.10Crack spacing and width for lightweight concrete with reinforcement ratio of 0.56%
Fig.11Crack spacing and width for lightweight concrete with reinforcement ratio of 0.76%
Fig.12Crack spacing and width for fiber reinforced virgin concrete with reinforcement ratio of 0.56%
Fig.13Crack spacing and width for fiber reinforced lightweight concrete with reinforcement ratio of 0.56%
工况
CS/m
CW/mm
测量
解析
测量
解析
普通混凝土
0.88
0.90
0.13
0.84
轻质混凝土
1.04
1.00
0.12
0.77
19.05 mm 筋径
1.08
1.04
0.13
0.88
22.23 mm 筋径
0.83
0.86
0.12
0.73
有纤维
1.13
1.27
0.12
1.03
无纤维
1.03
1.04
0.14
0.88
有预切缝
1.03
?
0.12
?
无预切缝
0.88
?
0.13
?
Tab.4Average crack spacing and width given field measurement versus analytical results
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