Nalivayko T. Increasing the strength of fiberglass concrete by intensive impregnation with a compound

The paper deals with the issues of increasing the physical and mechanical properties of fiberglass concrete by fluctuation with the help of intensive compound impregnation mode. Object of study. The process of impregnating the pore space of fiberglass with a liquid compound, which cures after filling the pores. The aim of the study. Improvement of physico-mechanical properties of fiberglass concrete by intensive impregnation of compound composition: liquid glass, nanosized silica, sodium silicon fluoride. Research Methods. Experimental studies were performed using experimental design methods. Physico-mechanical studies have been carried out in accordance with the standard standard methods for determining the strength, water absorption, shrinkage and creep deformation, density and frost resistance of building materials and products. The determination of the phase composition of cement stone and the microstructure of materials was performed by methods of physical and chemical analysis: infrared spectroscopy, electron microscopy. The novelty of the work is that by intensive impregnation of fiberglass with a liquid compound the compressive strength is increased by 36.5%, the flexural strength by 66.7%, the reduction of water absorption from 4.8% to 1.3%, the increase of frost resistance from 150 up to 400 cycles; it is theoretically substantiated and experimentally confirmed that intensive mode of impregnation of fiberglass with liquid compound by vacuum leads to acceleration of the impregnation process, helps to fill the porous space and increase the corrosion resistance of the fiber, due to the formation of hydrosilicate; shows the dependence of the strength of fibrous concrete impregnated with a liquid compound on the type of reinforcement fibers (basalt, carbon, fiberglass) and the intensity of impregnation. The practical results are the development of a universal technological scheme for the production of products of small architectural forms of impregnated fiberglass; the development of an effective composition of fiberglass: fiberglass with a diameter of 10-13 microns, length 13-15 mm - 4%; nanosilicon – 0,8% by weight of cement; W/C = 0,45; cement - 550 kg/m3; sand - 1375 kg/m3, providing a 52% increase in the strength of fiberglass; in that the proposed solutions have been tested and implemented at LLC “BК TITANIUM” (Kharkiv) and manufactured batches (50 units) of facing fiberglass panels; obtaining the economic effect from the use of impregnated fiberglass, which is 397,80 UAH. per 1 m3 of concrete; using the results of the dissertation in the educational process of the Department of Building Materials and Products of KNUСЕА in the preparation of specialists in the specialty 192 "Construction and Civil Engineering".