REACTIVE POWDER FIBER-REINFORCED CONCRETE WITH COMPOSITE DISPERSED REINFORCEMENT

Abstract

The paper is a theoretical study of reactive powder fiber-reinforced concrete with composite disperse reinforcement with improved characteristics. On the basis of the an analytical review of literary sources the hypothesis about the possibility of preventing fiber-reinforced concrete mixing and enhancing the uniformity of the structure of fiber-reinforced concrete due to the composition of disperse reinforcement with application in the optimal ratio of steel and basalt fibers for obtaining high-strength dispersed reinforced concrete with improved operational properties is formulated.

The effectiveness of using a basalt fiber with a length of 12 mm in a complex with a wavy steel fiber, in optimal proportions is established.

The technology and compositions of effective polydispersed fiber- reinforced concrete with using of steel and basalt fiber have been developed, with improved properties by increasing the homogeneity of the structure and significantly reducing the stratification of fiber concrete mixtures. It is shown that the use of steel wavy and basalt fibers in optimal ratios makes it possible to obtain reactive powder fiber-reinforced concrete with a compressive strength of up to 100 MPa and a flexural tensile strength of up to 20 MPa. Polydispersed fiber reinforced concrete using steel and polypropylene fiber was also investigated. The use as a component of composite disperse reinforcement of polypropylene fiber gives a slightly worse effect than basalt fibers. This is primarily due to the poorer distribution of polypropylene fibers in the concrete structure, which does not contribute to a uniform distribution of steel fibers.