Volynska I. Eco-concrete on the basis of slag-cement on the use of mica-based by-products of the mining industry

In the dissertation, the possibility of intensifying the processes of the structure of slag cement at the later stages of curing has been substantiated and experimentally proved, which provides improvement of operational and special properties of cement and ecocarbon on its basis due to the use of mica-based by-products of mining and extraction industry. The composition of the M400 slag cements of the grade, characterized by the content (up to 30%) of the flotation of gold-bearing ore and the content of the alkaline component is 2.3-3% in terms of Na2O, is developed and optimized. Such cements are characterized by the beginning of stamina 60 ... 75 min, strength after 2 days of hardening in the range of 7.5 ... 4.8 MPa and shrinkage deformations in 150 days - 0.511 mm / m; The peculiarities of processes of formation of astringent compositions in the presence of heavy metals in the form of Fe2O3, MnO and Pb2O3 have been determined, and it has been shown that along with physical blockages in an artificial stone matrix based on slag-liming astringent systems, the elements of heavy metals are chemically bound together in structure-forming compounds , which contributes to reducing the intensity of leaking heavy metals from the structure of the cement stone and provides the opportunity to utilize the waste flotation of gold-bearing ore. The possibility of controlling the rheological properties of concrete mixtures on the basis of slag cement by their modification by additives of surfactant of different nature of the main active ingredient is shown, and it is shown that the reduction of the effectiveness of surfactant on the basis of complex polyesters and the increase of the effectiveness of cationic surfactants that provide the obtaining of mobile and highly mobile concrete mixtures of grades P4 , P5 with the preservation of mobility within the same mark for 1 - 2 hours due to the formation of a positively charged surface on the surface of the interface of the phase boundary of the active phases of ions opposite to the slag component and the stability of the molecular structure of additives used in high alkaline environment. Compositions of bioblocks of classes B15 ... В40 have been developed, which are characterized by tensile strength at bending after 28 days of hardening (Rzg = 7.6 ... 7.8 MPa), low elastic modulus (E = 28.2 · 103 ... 29.9 · 103 MPa) with marks of frost resistance F150, F200, high corrosion resistance in solutions of sodium sulfate and magnesium (Сr = 0.9 ... 1.03)