Wall materials of increased water resistance with a composite gypsum binder
The paper presents the results of the study of new wall materials of improved water resistance on the basis of the composite gypsum binder (CGB). The character of the influence of the developed complex chemical additive consisting of an organic dewatering reagent Uniplast P211 and superplasticizer Uniplast SP95, which is a directed formation of fine-grained structure of gypsum cement stone, promotes the improvement of its physical and mechanical parameters: water demand reduction (2-fold), increase in the strength of the solidified CGB after 2 hours (3 times), and after 7 and 28 days (2.4-fold), improvement in water resistance of 1.5 times, and also deceleration of beginning of setting (8 times), is revealed. The nature of the effect of the composition, structure and operating conditions of composites on their properties is established: this is the optimization of sizes and morphology of the CGB particles binder, creation of a high-density packing of the filler that results in obtaining the rational microstructure of the gypsum cement stone and the contact zone with the filler and, as a consequence, increases the limit of compressive strength by 20-30% in accordance with the law of the structures affinity.