针对内蒙古通辽地区的氯盐环境,基于修正菲克第二定律和电化学腐蚀规律,开展混凝土内部氯盐输运及钢筋锈蚀模拟,利用多物理场耦合软件Comsol Muhiphysic建立风电机组基础钢筋锈蚀开裂模型,对该地区风电机组钢筋混凝土的寿命进行预测.结果表明:当混凝土表面的氯盐含量由 1.8%下降到 1.2%时,保护层开裂时间由27 a推迟到 31 a;通辽地区风电机组基础表面的保护层厚度为42 mm,其裂缝宽度达到允许的最大值需要 27 a,考虑到四季气候影响,实际需要 34 a;保护层厚度每增加 3 mm,开裂时间推迟约 1.2 a.
According to the chloride environment in Tongliao,Inner Mongolia,based on the modified Fick's second rules and electrochemical corrosion rules,the simulation of chloride transport and steel corrosion in concrete was carried out.The multi-physics coupling software Comsol Muhiphysic was used to establish the corrosion and cracking model of the wind turbine foundation steel bar,and to predict the structural life of reinforced concrete of wind turbine in this area.The results showed that when the chloride concentration on the concrete surface decreased from 1.8%to 1.2%,and the cracking time of protective layer was delayed from 27 years to 31 years.The thickness of protective layer on surface of wind turbine foundation in Tongliao area was 42 mm,and it took 27 years for the crack width to reach the allowable maximum value.Taking into account the climate in the four seasons,it took 34 years.For every 3 mm increased in the thickness of protective layer,the cracking time was delayed by about 1.2 years.