Features of the Heat Treatment of Concrete

Thermal desorption mass spectrometry is used to study products of the heat treatment of concrete samples containing a plasticizer and an antifreeze additive (urea). It is established that the heat treatment of concrete above 100°C is accompanied by the hydrolysis of urea with the release of ammonia and carbon dioxide. Destruction of the plasticizer and the urea remaining in the pores of the concrete begins at temperatures above 200°C. The release of ammonia from concrete continues up to 300°C. The release of toxic products of the plasticizer’s decomposition is observed in the same area. The energy of the observed processes is estimated.