PROPERTIES OF GYPSUM COMPOSITES USING AGGREGATE FROM AUTOMOBILE TIRE RECYCLING WASTE

The possibility of application of aggregate on the basis of waste recycled car tyres in gypsum-concrete composites is considered. Technological, physical-mechanical, thermal and acoustic properties of the composite with the content of light-weight aggregate 5, 10 and 20 % are investigated. The data for two types of rubber crumb: 0.8- and 0.6-mm fractions are presented. It was found that the introduction of lightweight aggregate of 0.6 mm fraction reduces the mobility of the mix-ture by 10.8, 21.6 and 45.9 %, respectively, and the aggregate of 0.6 mm fraction by 8.1, 29.7 and 40.5 %; the introduc-tion of rubber crumb of 0.6 fraction reduces the compressive strength by 30, 38 and 55 %, the introduction of lightweight aggregate of 0.8 mm fraction reduces the strength by 27, 36 and 56 %, respectively; density of gypsum concrete with 0,8 mm fraction aggregate decreases up to 1190 kg/m3, and with 0,6 mm fraction up to 1170 kg/m3; thermal conductivity of the composite decreases by 20 % at introduction of 20 % of rubber crumb of 0,6 mm fraction, and 0,8 mm fraction by 14 %; acoustic properties increase, the efficiency of sound absorption of gypsum concrete without filler was 5,2 - 39,6 %, with light filler of 0,6 mm fraction and 20 % content was 6,5 - 47,6 %, and 0,8 mm fraction was 7,9 - 50,4 %. The developed composition can be used as an initial composition for production of gypsum board, gypsum plasterboard sheets and other similar products.