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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Reduction of hexavalent chromium in cement binders
 Hrubý, Petr ; Šoukal, František (referee) ; Kalina, Lukáš (advisor)
The issue of hexavalent chromium contained in cement binders and the possibilities of its reduction are very current, due to the toxicity of Cr (VI) and constantly stricter regulations of the EU. The effort of achieving a cement binder with Cr (VI) concentration lower than 2 ppm and keeping this concentration unchanged during the long term storage is a frequently studied issue which needs to be solved. Requirements are put on the low cost for industrial use and without inducing changes of final properties of cement binders. A reducing agents based on iron (II) sulphate monohydrate potentially combined with some additives were studied in this study. The efficiency of reducing agents was analysed by commonly used UV-VIS spectrophotometry technique which uses 1,5-diphenylcarbazide as an indicator. The influence of added reducing agent on the mechanical properties was noticed by compressive strength test.
Detailed record
Reduction of hexavalent chromium in cement binders
 Hrubý, Petr ; Šoukal, František (referee) ; Kalina, Lukáš (advisor)
The issue of hexavalent chromium contained in cement binders and the possibilities of its reduction are very current, due to the toxicity of Cr (VI) and constantly stricter regulations of the EU. The effort of achieving a cement binder with Cr (VI) concentration lower than 2 ppm and keeping this concentration unchanged during the long term storage is a frequently studied issue which needs to be solved. Requirements are put on the low cost for industrial use and without inducing changes of final properties of cement binders. A reducing agents based on iron (II) sulphate monohydrate potentially combined with some additives were studied in this study. The efficiency of reducing agents was analysed by commonly used UV-VIS spectrophotometry technique which uses 1,5-diphenylcarbazide as an indicator. The influence of added reducing agent on the mechanical properties was noticed by compressive strength test.
Detailed record

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