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Surface corrosion and microstructure degradation of calcium sulphoaluminate cement under dry wet cycle in sulfate solution

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Document pages: 8 pages

Abstract: The hydration products of calcium sulphoaluminate (CSA) cement are different from Portland cement. The degradation of CSA cement in sulfate solution was studied. The surface corrosion was recorded and the microstructure was examined by scanning electron microscope (SEM). The results show that Na +, Mg2 + and Cl − have an effect on the stability of ettringite. At the initial stage of sulfate attack, salt crystallization is the main factor leading to the degradation of CSA cement specimens. The decomposition and carbonization of ettringite will lead to the long-term degradation of CSA cement samples under dry wet cycle in sulfate solution. With the increase of wet Dr, surface spalling and microstructure degradation increased significantly cycles, sulfate concentration, and water to cement ratio. Magnesium sulfate and sodium chloride reduce the degradation when the concentration of sulfate ions is a constant value.

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