Modern studies on construction buildings revealed the use of organic natural polymers as additives for the construction materials. It was demonstrated that by using this additives in composition of plastering mortars the mechanical properties and impermeability was improved. Eight recipes of plastering mortars, with and without organic natural polymers such as casein, rice and egg were studied by 1D 1H NMR relaxometry. For the determination of the T2 transverse relaxation time distributions, the acquired CPMG decays were analyzed using a fast Laplace inversion algorithm. These distributions were obtained for wet and dry plaster mortars which were measured after 28 days from preparation during the hydration of mineralogical components. In almost all cases, the distributions of transverse relaxation times T2 were characterized by four components associated with hydration water and water in three types of pores of different dimension. The relaxation ratio (1/T2) of hydration water were correlated with mechanical resistance at elongation and compression and water absorption degree. Among replacement additives the plaster mortar with casein increases the mechanical properties.

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