The paper presents the results of the influence of bacteria (sulfur and nitrogen) on the durability of cement mortars CEM I and polymer modified cement mortars. Received results showed the changes of the tightness materials. Sulfur bacteria caused a caulking structure by deposition of corrosion products of sulphate. However, the unsealing of the structure of cement mortars and mortars modified with acrylics and polysiloxanes caused nitrogenous bacteria. Polycarboxylic resin- modified mortars showed the smallest changes after exposure to corrosive environment of the bacteria.
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