To study the concrete cracking caused by steel strand corrosion, the corrosion-induced crack propagations in the inside and the surface concrete subjected to the accelerated corrosion, respectively, were observed. The distribution of corrosion products at the strand-concrete interface and in the inside concrete were also studied. The effects of aggregate morphology on crack propagation were discussed. Results show that the aggregates play an important role in the crack distribution and propagation in concrete. Most of cracks in the concrete surface are propagated from the interior cracks associated with the aggregates. Stirrups can significantly restrain the crack propagation in concrete. The twist shape of the strand increases its contact with the corrosive liquid so that the corrosion rate is accelerated. The composition and color of corrosion products at various locations is different. The color of corrosion products at the steel-concrete interface is deeper than that in the concrete cracks.