中文摘要：

混凝土结构锈胀开裂是导致混凝土结构耐久性失效的主要原因。在锈胀开裂过程中，铁锈是否填充到锈胀开展的裂缝中，是影响锈裂模型预测结果准确与否的重要因素之一。对人工气候环境下加速劣化的混凝土试块进行切片研究，采用数码显微镜观察了混凝土锈胀开裂裂缝中铁锈分布的情况，由此分析随裂缝开展铁锈发展的过程。试验研究认为，对于外裂裂缝，在裂缝开展到保护层表面之前，铁锈对裂缝的填充可忽略不计；只有在裂缝贯通到保护层表面后，铁锈才会逐渐填入钢筋附近的裂缝之中，并能在较远位置的裂缝边缘观察到铁锈的吸附。而对于内裂裂缝，钢筋锈蚀到一定程度后，也会有少量的铁锈填入裂缝中，但填充过程要缓慢得多。铁锈发展的这一特性，对混凝土结构锈裂过程的分析和合理锈裂模型的建立具有非常重要的指导意义。

英文摘要：

Corrosion-induced cracking is the major cause of deterioration in reinforced concrete structures.During the corrosion-induced cracking process, whether the corrosion products fill in the corrosion-induced cracks or not is one of the key factors which affects the prediction of the cracking model due to corrosion.A reinforced concrete specimen subjected to chloride ingress in an artificial environment for 2 years was cut into slices to investigate the distribution of the corrosion products in the corrosion-induced cracks .There are mainly two kind of cracks, namely the external racks and the inner cracks.It is found that for external cracks, the corrosion products rarely fill in the cracks before surface cracking.While after surface cracking, the corrosion products fill in the cracks near the rebar, some of the corrosion products have also been observed on both sides of the cracks farther from the rebar.For internal cracks, after rebar corrosion reaches to a certain extent, very little corrosion products fill into the cracks.The development process of the corrosion products obtained here is helpful for establishing the reasonable corrosion-induced cracking model.