Thermal desorption mass spectrometry investigation of the decomposition processes of urea in concrete

Abstract

Thermal desorption mass-spectrometry investigation of the processes of thermal destruction of
concrete samples containing antifreezing urea additive was performed. It was demonstrated that the
decomposition of urea took place with ammonium and carbon dioxide release to the gas phase during the
exploitation. The process of thermal destruction and its energy are evaluated. It was found out that the heat
treatment doesn’t allow to remove of urea and ammonium from concrete volume.