COMPOSITE GYPSUM BINDER USING DOLOMITE FLOUR AND ASH AND SLAG WASTE
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Abstract
The article presents the results of studies of the physical and mechanical properties of a composite gypsum binder containing ash and slag mixture, dolomite flour and portland cement. Mathematical models of the influence of recipe factors on the basic physical and mechanical properties of CGB, compressive strength, tensile strength in bending, density, water absorption and porosity have been obtained, allowing to optimize the composition of the raw materials of the composite gypsum binder. It has been shown that by changing the content of prescription factors in the composition of the CGB, it is possible to vary the physical and mechanical characteristics: compressive strength in the range from 9,4 MPa to 13,2 MPa, tensile strength in bending – from 3,2 MPa to 5,7 MPa, density – from 1345 kg/m3 to 1468 kg/m3, water absorption – from 18,2% to 24,4%. Based on the optimized composition of the CGB raw material mixture, gypsum concrete with a compressive strength of 13,3 MPa and a softening coefficient of 0,44 was obtained, which can be used for the manufacture of wall blocks.
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