Composition and expansion coefficient of rust based on X-ray diffraction and thermal analysis

Corrosion production can make cracks in the concrete cover. Because their volumes are higher than that of the original metal. Therefore, the rust expansion coefficient is one of the key parameters in concrete cracking model caused by steel corrosion. X-ray diffraction and the thermal analysis were used to characterize eight corrosion products collected from various different environments. The results show that the compositions and the expansion coefficients for rust samples are different due to their different servicing environments. The rust expansion coefficients corresponding to the different environments were proposed, which can be applied to steel corrosion induced concrete cracking model.

Research highlights
► Thermal technique can be utilized to classify corrosion produces.
► Expansion coefficients of rust growth from different environments can be calculated.
► Rust expansion coefficients corresponding to different environments is proposed.