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| Reinforcement design of composite pavement continuously reinforced with basalt fiber reinforced plastics bars |
| GE Qian-ru,HUANG Zhi-yi,WANG Jin-chang,ZHANG Chen-xu |
| Institute of Transportation Engineering,Zhejiang University,Hangzhou 310058, China |
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Abstract The crack control indicator formulae were deduced by the analytical method in order to control the transverse cracks in the continuously reinforced concrete (CRC) pavement structure resulting from the temperature drop and shrinkage effect. The validity of formulae was verified by finite element simulation. Then the effects of basalt fiber reinforced plastics (BFRP) bars material properties and reinforcement program on cracks were specifically analyzed. Results showed that analytical method results accorded with the finite element simulation, which can be used in the reinforcement design of CRC+AC (asphalt concrete) composite pavement reinforced with BFRP bars. The effect of BFRP bar elasticity modulus on crack spacing and width is significant. Thus the relatively high elastic modulus is required to reduce the crack width. The bond stiffness of BFRP bars has great impact on crack spacing and width and it shouldn't be less than 20 GPa/m. Small diameter and spacing reinforcement program is benefit to control cracks under the same reinforcement ratio. Meanwhile the reinforcement ratio shouldn't be less than 0.5%. Crack spacing and width control indicators should be increased to 2.0 m and 1.0 mm respectively by taking the corrosion resistance of BFRP into consideration．
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Published: 06 June 2018
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BFRP连续配筋复合式路面配筋设计
为了控制连续配筋混凝土(CRC)路面结构在温降干缩作用下产生的横向裂缝,利用解析法推导裂缝控制指标的计算公式. 结合有限元模拟验证解析公式的有效性,分析玄武岩纤维（BFRP）筋的材料特性与配筋方案对裂缝的影响. 研究结果表明: 解析法与有限元模拟结果吻合,可以用于CRC+AC复合式路面BFRP配筋设计； BFRP筋弹性模量对裂缝间距与宽度的影响显著,为了减小裂缝宽度,采用弹性模量较高为宜；BRFP筋黏结刚度对裂缝间距与裂缝宽度的影响较大,黏结刚度不应低于20 GPa/m；相同配筋率时,小直径小间距方案对裂缝控制有利,配筋率不宜小于0.5%；考虑BFRP材料的耐腐蚀性,建议提高裂缝间距与宽度控制指标,分别不大于2.0 m和1.0 mm.
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