THE INFLUENCE OF GLASS CONTAINING COMPONENT ON GYPSUM BINDER AND DRY MIX MORTAR PROPERTIES

Abstract

The paper studies the properties of the gypsum binder after the addition of glass containing component (crushed granulated foam glass) and the suitability of the latter for the development of a new composition of the heat-insulated gypsum mixture.It is shown that the addition of the glass containing component (GCC) fraction of 0.14–1.25 mm in the amount of 5–15 % provides the highest strength increase of the gypsum binder. The presence of GCC fractions of 0.063–0.14 mm in the composition of the gypsum binder increases its softening coefficient from 0.42 to 0.48.The main properties of the gypsum mixture are studied after the addition of the GCC fraction of 0.063–4.0 mm in the amount of 30, 40 and 50 % of the binder mass. The initial setting of the GСС-containing mortar mixture occurs no later than in 6 minutes. The introduction of 50 % GCC significantly reduces the water retaining power to 85 %. An increase in the GСС content from 30 to 50 % in the composition of the gypsum mixture leads to a decrease in the thermal conductivity of the samples from 0.279 to 0.209 W/(m×°С). The compressive strength reduces from 15.85 to 9.273 MPa as the GСС content increases to 50 %. The adhesive strength to ceramic brick for compositions containing 30 and 40 % GСС ranges from 0.44 to 0.69 MPa.In relation to physical, mechanical and heat insulating properties, compositions containing 30 and 40 % of GСС are the most effective. These compositions can be modified by the addition of various setting retardants, water-retaining and plasticizing additives.