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为了研究混凝土材料非均匀特性对保护层锈裂行为的影响,基于蒙特卡罗方法建立了随机骨料模型,采用Matlab软件编写了骨料生成和投放代码,并考虑了界面层的影响.通过改变锈蚀层厚度,对钢筋锈胀引发的混凝土保护层开裂行为进行了细观有限元模拟.结果表明,混凝土内钢筋锈蚀产物膨胀具有非均匀性,砂浆与骨料的界面是钢筋混凝土保护层锈胀过程中的最薄弱环节.当锈蚀层的最大厚度为1.24μm时,界面开始产生裂缝,随后钢筋周围砂浆产生裂缝;当锈蚀层的最大厚度为9.00μm时,混凝土保护层表面出现裂缝,此时钢筋的有效锈蚀率仅为0.186%;当锈蚀层的最大厚度达到18.00μm时,混凝土中钢筋之间裂缝贯通,此时裂缝分布图与实测锈胀开裂相似,表明细观模拟计算可靠.
In order to study the effect of non-uniform properties of concrete on the corrosion behavior of protective coating, a random aggregate model was established based on Monte Carlo method, and the generation and delivery codes of aggregate were written by Matlab software, and the influence of interface layer was considered. The results show that the expansion of corrosion products of reinforcing steel bar in concrete is inhomogeneous, and the interface between mortar and aggregate is the corrosion expansion of reinforced concrete The weakest link in the process.When the maximum thickness of the corrosion layer is 1.24μm, the interface begins to crack, and then the mortar cracks around the rebar. When the maximum thickness of the corrosion layer is 9.00μm, the surface of the concrete protective layer cracks, The effective corrosion rate of steel bars is only 0.186%. When the maximum thickness of corrosion layer reaches 18.00μm, the cracks between the steel bars in concrete penetrate through. The distribution of cracks is similar to the measured rust expansion cracking, indicating that the mesoscopic simulation calculation is reliable.