Aluminous test
Determining of the presence of aluminous cement of a sample of hardened concrete (oxine-method)
The test is based on the traditional method of oxine to determine qualitatively the presence of aluminum in a dissolution.
The sample of concrete, of approximate sizes as a lighter, is subjected to a mechanical burin to separate the part corresponding to the hardened binder mass. This is attacked by a dissolution of caustic soda and subsequently filtered. The liquid thus obtained is brought into reaction with the oxine and the pH of the medium changes by means of the hydrochloric acid. Finally, the resulting liquid is observed and the turbidity of the medium is evaluated. If the result raises doubts, the test is repeated and if they persist, it is tested with a DRX.
This procedure has been applied for more than 25 years and we calculate that we have done more than 70,000 analyzes with a reliability greater than 99.7%
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