THE EFFECT OF VARIATIONS OF SODIUM SULFATE IN THE COMPLEX ADDITIVE IN CONCRETE MIXTURES BASED ON SULPHONATED HEAVY RESIN PYROLYSIS ON THE PERSISTENCE OF THE MOBILITY OF CONCRETE MIXES
One of the factors, time of unloading of concrete mix from vehicles which is not normalized, but defines time during which concrete mix is suitable for packing in a design is considered. The analysis of works in which chemical additives allowing to increase duration of preservation of technological properties of concrete mixes are offered is made. The proposed variant of the synthesis of the additive in concrete mixtures on the basis of heavy resin ofpyrolysis increases the retention time of mobility of the concrete mix.