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浙江大学学报(工学版)
浙江大学学报(工学版)  2020, Vol. 54 Issue (6): 1194-1201    DOI: 10.3785/j.issn.1008-973X.2020.06.017
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基于大比尺模型试验的连续配筋混凝土路面开裂研究
张雅婷1(),JefferyRoesler2
1. 江南大学 环境与土木工程学院，江苏 无锡 214122
2. Department of Civil and Environmental Engineering，University of Illinois at Urbana-Champaign，IL 61801，USA
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
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摘要：

为控制连续配筋混凝土路面（CRCP）的横向裂缝，修建大比尺模型-连续配筋混凝土梁（CRCB），分析混凝土材料、配筋率、纤维及横向预切缝对CRCP开裂的影响. 构建解析模型推导横向裂缝间距和宽度的计算表达式，理论量化不同设计参数对CRCP横向裂缝特征的影响. 结果表明：解析结果与现场勘测数据吻合，说明解析法切实可行；横向裂缝随着试验梁龄期增长而发展，且于19个月后趋于稳定；配筋率对裂缝间距和宽度影响较大，采用筋径为22.23 mm（#7号钢筋）的试验梁，其裂缝间距和宽度比采用筋径为19.05 mm（#6号钢筋）的试验梁降低了17%左右；采用轻质混凝土可增大裂缝间距、减小裂缝宽度，为控制冲断提供可能；加入纤维和设置横向预切缝可增大裂缝间距、减小裂缝宽度.
关键词： 连续配筋混凝土路面（CRCP）;  大比尺模型试验;  横向裂缝间距;  横向裂缝宽度;  解析模型    
Abstract:

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.
Key words: continuously reinforced concrete pavement (CRCP)    large-scale model test    transverse crack spacing    transverse crack width    analytical model
收稿日期: 2020-01-11 出版日期: 2020-07-06
CLC:  U 416  
基金资助: 江苏省自然科学基金资助项目（BK20190604）；中央高校基本科研业务费专项资金资助（JUSRP11937）；美国伊利诺伊州公路局资助项目（RR-14-9168）
作者简介: 张雅婷（1990—），女，助理研究员，博后，从事混凝土路面材料和结构研究. orcid.org/0000-0001-8175-3044. E-mail： ytzhang@jiangnan.edu.cn
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引用本文:

张雅婷,JefferyRoesler. 基于大比尺模型试验的连续配筋混凝土路面开裂研究[J]. 浙江大学学报(工学版), 2020, 54(6): 1194-1201.

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.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2020.06.017    或    http://www.zjujournals.com/eng/CN/Y2020/V54/I6/1194

图 1  连续配筋混凝土试验梁（CRCB）概况
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
表 1  连续配筋混凝土试验梁（CRCB）各工况详细情况
图 2  连续配筋混凝土试验梁横断面图
图 3  连续配筋混凝土试验梁现场状态
图 4  试验梁浇筑14 d后的横向裂缝位置图
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
表 2  不同龄期下各试验段的平均裂缝间距和平均裂缝宽度
图 5  不同龄期下试验梁的横向裂缝数量
图 6  连续配筋混凝土梁解析模型
图 7  连续配筋混凝土梁受力分布
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 ?
表 3  解析模型中混凝土材料和钢筋的输入参数
图 8  普通混凝土+0.56%配筋率时开裂间距与宽度
图 9  普通混凝土+0.76%配筋率时开裂间距与宽度
图 10  轻质混凝土+0.56%配筋率时开裂间距与宽度
图 11  轻质混凝土+0.76%配筋率时开裂间距与宽度
图 12  普通纤维混凝土+0.56%配筋率时开裂间距与宽度
图 13  轻质纤维混凝土+0.56%配筋率时开裂间距与宽度
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 ?
表 4  各工况下平均横向裂缝间距和宽度的现场测量与解析结果
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