Development of the offshore phosphorite deposits in the Pacific shelf is actual now. Extraction of phosphorus is proposed using electrothermal sublimation technology. Such method is accompanied by the production of large amount of slag materials which can be used for fabrication of high quality building materials. These include the slag cements without or small content of clinker, foam glass, slag pumice, slag fibers, glass etc. The paper presents the test results relating to corrosion resistance of concrete with slag cement with the addition of phosphorus slag by the technology of the electrothermal sublimation.

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