Vol 2, No S2 (2014)

The article presents the study results of the effects of modified nanoadditive polycarboxylate plasticizer Melflux 1641 F on the rheological and strength characteristics of cement concrete. The study showed that the concrete mixture brand could be improved on its workability by means of the proposed modification method without the compressive strength reduction. The study demonstrated a reduction of the expensive polycarboxylate plasticizer Melflux 1641 F consumption due to its modification by the additive ANKU 2. Depending on the requirements to the mobility of concrete mixtures, the consumption of plasticizer could be reduced from 19 to 43%, with the largest savings of Melflux 1641 F observed in mixtures of highly mobile brand P5.

The paper presents a study of some carboxylic acids and filled cement stone interaction. The authors analyze the damages to building materials based on mineral binders in aggressive media. The study shows the formation of the structure of cement composites by introducing zeolite fillers.

This article presents the experimental values of the mechanical characteristics and properties of fiberglass rebars. The authors studied the work of rebars under the action of aggressive media and different temperature regimes. It was found that the optimum length for determining the mechanical properties of fiberglass rebar by using the buckling method are samples of 210 mm. When the temperature increases, rebar becomes more ductile, elastic modulus and strength of reinforcement significantly reduce.

The article discusses polymer impregnation of concrete to protect it from weather and corrosive influences. This is one of the ways of the modern industry of building materials, which enhances their durability and has a considerable economic effect.

The article present the results of experimental studies of the influence of active diluent Etal-1 on the rheological and elastic-strength properties of epoxy composites. By using the reverse torsion pendulum, the authors studied the temperature dependence of the dynamic shear modulus, loss modulus and mechanical loss tangent of epoxy composites. It was found that the results obtained from the analysis of the temperature dependence of the dynamic shear modulus and loss modulus results show the same characteristic temperature of a-transition, which should be regarded as the glass transition temperature of polymer composite.