PRELIMINARY ACTIVATION OF CEMENT-SAND MIXTURE IN ORDER TO INCREASE THE STRENGTH OF CONCRETE

The article discusses an effective technology for producing concrete with increased strength. For this purpose, it is proposed to perform preliminary mechanical activation of cement sand natural humidity (5-8%) in energized apparatus, which a rotary-type centrif-ugal mixer-disintegrator. During mixing, hydration occurs the formation nanodis-persed products on surface grains, are stripped off withsand and enter mixture. Thus, micro-volumes cement-sand mixture, there uniform dis-tribution fraction nanodispersed particles –highly dispersed products, hydra-tion cement. activity resulting activated mixture during subsequent was determined using differential microcalorimeter water-solid ratio (V/T) equal 0.2. Calo-rimetric studies have shown that temperature change inthe proceeds sim-ilarly pure contact water, but after first induction period. mechanism interaction water changes significantly, accompanied by increase difference material cells 0.87-0.88 °C maintained long period time. This explained fact not only due processes hydration, also additionally chemical reactions calcium hydrosilicates nanodisperse quartz sand.The preparation large aggregate estimated amount can significantly strength its other performance characteristics.