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Effects of cement type and water cement ratio on the formation of sulfur manganese ore

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Document pages: 6 pages

Abstract: Cement mortar prism is made of three different cement types, different water cement ratio and 30 mass limestone filler. After curing in water at room temperature for 28 days, these samples were immersed in 2 magnesium sulfate solution at 5 ° C, and the appearance and strength development of each mortar were measured every 1 year. The samples selected from the prism surface after immersion for 1 year were examined by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The results show that compared with ordinary portland cement (OPC) mortar, mortar containing sulfate resistant Portland cement (SRC) or sulphoaluminate cement (SAC) undergoes weak degradation due to sulfate attack in the form of sulphoaluminate. Low water cement ratio will lead too better resistance to the thaumasite form of sulfate attack of the cement mortar. A great deal of thaumasite or thaumasite-containing materials formed in the OPC mortar, and a trace of thaumasite can also be detected in SRC and SAC mortars. Therefore, the thaumasite form of sulfate attack can be alleviated but cannot be avoided by the use of SAC or SRC.

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