IntroductionAlthough polymer-concretes have been investigated for more than 30 years and studies in this field are being carried out in many countries [1][2][3][4][5][6][7][8][9], structural polymer-concretes still remain a relatively new class of composite building materials. The properties of these materials are still being explored, new compositions of more perfect and promising polymer-concretes, including those for special purposes, are being developed, the experience in industrial production of articles and structures is being accumulated, and the results of analyzing the behavior of these materials in various operating conditions are being generalized [8][9][10].It is known that polymer-concrete differs from the usual concrete manufactured on the basis of portland cement by its high initial strength, chemical resistance to various corrosive media, and a rather high adhesion to metal, wood, cement concrete, and other materials. In addition, many investigators report on the increased deformability of some polymer-concretes (shrinkage, creep, and high coefficients of thermal expansion), as well as the increased sensitivity to the action of water, temperature, light, and other factors.A feature of polymer-concretes as composite materials is the high degree of filling by mineral aggregates, attaining 90% by volume. It should be noted that the content of fillers in industrial plastics usually varies (depending on their application) in the range of 10 to 40% by volume. Thus, polymer-concretes are composites with a high degree of filling and, accordingly, with a large total surface of filler particles. The properties of such heterogeneous multicomponent systems, to a great extent, depend on the interaction effects at the polymeric binder/mineral aggregate interface. Reactivity of the filler surface affects the adsorption interaction of the filler with the polymeric binder, wettability of the filler, composition and structure of the interphase layer, and curing kinetics of the binder, and, as a result, considerably influences the physicomechanical characteristics of polymer-concrete on the whole. At the same time, the chemical composition of mineral aggregates obtained from rocks of various deposits can be quite different. Therefore, investigation of the properties of polymer-concretes based on mineral aggregates of certain deposits is still timely. The aim of this study is to investigate a structural polymer-concrete, namely a cementless, moisture-free, highly filled composite based on a polyester binder and mineral aggregates from Latvian rock deposits. The stages of our investigation are as follows:-design of the composition of polymer-concrete (type of fillers, granulometry, composition of a polymer-concrete mix, technological characteristics, and corrective actions), -examination of the mechanical properties in short-term loading, and -examination of creep in long-term loading. Initial Materials and Composition of a Polymer-Concrete MixPolyester resin of trademark Norpol 440 was used as the polymeric binder, a...
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