PRODUCTION OF SILICATE WALL MATERIAL BASED ON OF OVERBURDEN BREEDS ROCKS OF COAL MINING ON THE EXAMPLE OF REPUBLIC TUVA DEPOSIT
In a market economy, a significant increase in prices for the transportation of high-quality raw materials and energy resources for technological needs requires the development of more economical and environmentally friendly wall materials for mass use. At the same time, in the country there is an acute question related to the deficit of needs of natural mineral raw materials used for this type of production of building materials. The solution to this problem can be to the involvement of mineral industrial waste as well as non-traditional materials of natural and man-made bases in the raw material base. The possibility of receiving silicate wall material of not autoclave curing on the basis of overburden burned breed of coal mining and lime of fields of the Republic of Tuva is shown. Overburden burnt rocks of coal mining (gliese) of the Chadan coal mine are represented by dense rocks of argillite-siltstone origin in composition close to aluminosilicate raw materials with a high content of silicon and aluminum oxides. The binder was air lime, obtained by calcining local limestone Hairakan deposit, which belongs to the first grade with a calcium oxide content of CaO of more than 90 %. Influence of various technology factors on properties of the received material - optimum contents knitting as a part of mix, humidity of composition of mix, size of pressure of pressing and a condition of curing of the received products is revealed. It was established that, depending on the chemical-mineralogical and granulometric composition of the raw mix, silicate wall material with improved properties (strength more than 15 MPa) is obtained at a 30 % lime content with raw pressing (30 MPa) and subsequent hardening in moist environment with the use of heat moist treatment.