CONCRETE BY USING MAN-MADE WASTE FOR VIBRATION-PRESSED PRODUCTS.

The article presents the results of research on the production of vibro-pressed products from fine-grained concrete us-ing rubber chips obtained by processing rubber products. The influence of cement consumption, rubber chips, microsilica as a microfiller, and superplasticizers of various compositions and structures on the physical and mechanical properties of concrete is considered. The influence of additives of rubber chips, silica and superplasticizers on the change in the proper-ties of fine-grained concrete has been evaluated. It has been established that the most rational compositions are concrete mixtures with a content of 5-10% rubber crumbs when replacing sand fractions. It is proved that when adding microsilica to a concrete mixture with rubber chips, concrete for vibration-pressed products can be obtained, characterized by a dense structure and strength indicators that are slightly inferior in strength to the control composition, and with reduced water absorption compared to compositions with rubber chips. The combined use of superplasticizer and silica reduces the water-cement ratio, improves the mixing quality and uniformity of the concrete mix for vibration-pressed products. The use of polycarboxylate-based superplasticizer in the composition of concrete with rubber chips has a more effective effect on the increase in strength of the composite, which is due to the peculiarities of its composition, structure and mechanism of action on cement particles.