Abstract: The characteristic feature of the herein disclosed method resides in that it involves a zone control over temperature and humidity of articles being treated within the space of a tunnel chamber, the articles being blown with an air agent having a temperature of 40.degree.-100.degree. C. prior to the step of temperature increase whereas in the zone of said temperature increase the articles are treated with a steam-air mixture for a period of 1-6 hours, the temperatures and humidity of the mixture being gradually increased to their permissible values corresponding to the given type of articles being treated; in so doing the articles in the isothermal curing zone are affected for a period of 2-6 hours with a heat-carrying agent having a temperature of 60.degree.-95.degree. C. and a relative humidity close to 100% while in the cooling zone the articles are blown with a cooling agent having a relative humidity of 35-90% for a period of 0.3-1.5 hours.

Abstract: Apparatus for treatment of concrete articles having a pre-drying chamber where the articles are pre-treated by being blown with air having a temperature of from 40.degree. C. to 100.degree. C. The apparatus is provided with a treatment channel where the pre-dried articles are received and treated in a temperature-increase zone with a steam-air mixture for a period of 1-6 hours. The articles are treated in this first zone with a temperature increase and the temperature and humidity are gradually increased to their permissible values corresponding to the given type of articles. The articles are moved from the first zone to a second zone constituting an isothermal zone where the articles are treated for a period of 2-6 hours with an air-steam mixture and a temperature from 60.degree. to 90.degree. C. and a relative humidity close to 100%. From this latter zone in the tunnel the articles are moved into a cooling zone where the articles are cooled by blowing of air for a period of from 0.3 to 1.