Case study on the deterioration and collapse mechanism and curing technique of RC coal bunkers

Besides the inspection of material behaviors of the collapsed raw-coal surge bunker, comprehensive safety of the loading bunkers and the clean-coal bunkers were inspected. The parameters involve apparent characteristics, carbonized depth, compression strength of concrete, corrosion rate of steel bar, decline degree of bunkers and so on. In addition, analyses were made on the special natural, technologic, mechanical and geologic environment around the bunkers. On this basis, this paper studied the deterioration and collapse mechanism of reinforced concrete (RC) bunkers. The results suggest that the coupling action of poor concrete quality, severe natural environment, complex technologic and mechanical environment, and also special geologic environment speed up the deterioration rate of RC, which is a major reason for collapse of raw-coal surge bunker. And then further investigation was made on the curing techniques of degraded RC bunkers. It can provide theoretical basis for ensuring the long-term safety, workability and durability of degraded RC coal bunkers.