Influence of different corrosion environments on mechanical properties of a roadbed rehabilitation polyurethane grouting material under uniaxial compression
Influence of different corrosion environments on mechanical properties of a roadbed rehabilitation polyurethane grouting material under uniaxial compression
复制标题
不同腐蚀环境对单轴压缩路基修复聚氨酯灌浆材料力学性能的影响
DOI：
10.1016/j.conbuildmat.2021.124092
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发表时间：
2021
影响因子：
7.4
通讯作者：
Mingsheng Shi
中科院分区：
文献类型：
--
作者：
Zhenyang Wang;Mingrui Du;Hongyuan Fang;Chao Zhang;Manjun Li;Mingsheng Shi
路基修复聚氨酯（PU）注浆材料在不同化学腐蚀作用下的力学性能是评价其长期性能的理论基础，但目前尚不明确。将不同密度的PU灌浆材料分别浸入水、H2SO4、HCl、naoh溶液中不同时间，然后进行纵波速度试验和单轴压缩试验。分析了不同腐蚀环境对PU试样损伤及单轴抗压强度的影响，建立了化学腐蚀与外载荷耦合作用下的统计损伤本构模型。结果表明：水对PU注浆材料强度的影响较小，而酸性和碱性环境对PU注浆材料强度的影响较小，化学腐蚀时间越长，强度下降幅度越大；在h2so4、HCl和naoh腐蚀下，PU试样的屈服强度下降幅度最大，分别为32.8%、31.3%和21.4%。基于统计损伤本构模型的理论应力-应变曲线与屈服前试验曲线吻合较好（平均差值为0.077 ~ 1.017 MPa），表明理论模型的合理性。
The mechanical properties of the roadbed rehabilitation polyurethane (PU) grouting materials subjected to different chemical corrosion are the theoretical basis for evaluating the long-term performance, which, however, is not clear yet. Here, the PU grouting materials with different densities were immersed in water,H2SO4,HCl, andNaOHsolutions for different times, followed by the P-wave velocity tests and uniaxial compression tests. The influences of different corrosion environments on the damage and uniaxial compressive strength of PU samples were analyzed, and the statistical damage constitutive model under the coupling effects of chemical corrosion and the external load was established. Results show that the water brings little influence whereas both the acid and alkaline environments degrade the strength of PU grouting materials, and the longer the chemical corrosion time is, the greater the decrease in strength. The maximum declines in the yield strength of PU samples corroded byH2SO4,HCl, andNaOHsolutions are about 32.8%, 31.3%, and 21.4%, respectively. The theoretical stress–strain curves based on the statistical damage constitutive model are in agreement with the experimental ones before yielding (with the average difference of 0.077–1.017 MPa), indicating the rationality of the theoretical model.