The results of the investigation of phase structural transformations of cement stone as a result of the influence of the aggressive environment of the poultry farm are presented. Analysis of the change in the phase composition of cement stone samples showed that according to the average content of C3S increase in the increase of degree of hydration is represented by the sequence: zone I (air medium with minimal aggression) - zone III (wet environment with maximum concentration of active substances) - zone II (air zone with periodic aggressive action). The degree of carbonization, depending on the test conditions of the samples, is characterized by a similar zonal dependence. In this case, the removal of CaO during the acid leaching of the peripheral regions of the samples was detected to a greater extent during testing in zones II and III.