INVESTIGATION OF THE COMBINED EFFECT OF NATURAL STONE-SHELL MINING WASTE AND CHEMICAL ADDITIVES ON THE TECHNOLOGICAL PROPERTIES OF THE CONCRETE MIXTURE

The influence of saw waste from the extraction of natural shell stone from the Beineu deposit and chemical additives on the preservation of the properties of the concrete mixture is investigated. It was determined that when using the MasterRheobuild 5555 superplasticizer (1.6% of the binder weight or 6.75 kg/m3), the mobility of the concrete mixture is maintained for 2 hours, then its sharp decrease occurs and this is accompanied by a decrease in the volume of entrained air to 16%. The introduction of the Sika ViscoCrete 20HE KZ superplasticizer into the concrete mixture B35 in an amount of 1% of the binder weight or 4.20 kg / m3 prolongs the retention of mobility up to 4 hours 30 minutes and a decrease in the precipitation of the cone is accompanied by a decrease in the initial volume of entrained air to 7%. The research results have shown that in order to increase the preservation of concrete mixtures with superplasticizers, it is necessary first of all to select the components of "superplasticizer – cement - filler", which have good compatibility.