Abstract: A new method for absorbing carbon dioxide invading cement and enhancing carbonation resistance of cement material is proposed based on the anion exchange capacity and structural reconstruction capacity of layered double hydroxides ( LDHs ) . X-ray diffraction was used as the main means to characterize structure changes and the ability of carbonation resistance performance in cement materials contained LDHs. The results shows that: LDHs calcined at 500 ℃ has a strong ability to structure reconstruct, and it can absorb carbon dioxide in cement hydration environment and effectively improve the ability of carbonation resistance capacity of cement materials.

Key words: LDHs;structure reconstruction;cement material;carbonation