Effect of Additives Reducing Water-Soluble Chromium (Cr⁶⁺) Content in Portland Cement for Chrysotile Cement Products

In recent decades, global practice has tightened requirements for the quality of building materials, and especially for their environmental safety. For cement and cement compositions, this problem is associated with a decrease in the chromium content, which belongs to highly hazardous compounds. From the environmental point of view, the greatest danger is hexavalent chromium Cr(VI), especially water-soluble, which is a carcinogenic product by its chemical nature, causing disruption of the immune system. 

Purpose: The aim is to select a dechromator dosage in the weight, reducing the content of water-soluble chromium (Cr⁶⁺) in Portland cement used for chrysotile cement products to a standardized value not over 0.0002% and compare additives from two different companies. 

Methodology: At the first stage of laboratory tests, Portland cement clinker and additives are ground together in a Retsch RM200 laboratory mortar mill. The second stage involves joint grinding of Portland cement clinker, gypsum and additives in a laboratory drum mill MBL.

Research findings: Additives of dechromators are proposed by companies OOO “Sintez OKA-Stroitelnaya Khimiya” and MC-Bauchemie. The samples of both companies show a positive effect on the concentration decrease of water-soluble chromium (Cr6+) in Portland cement used in the production of chrysotile cement products.

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