Dispersed reinforcement in concrete technology

Boris Efimov,Gulzar Dosanova,Ekaterina Bobrova,Sergey Isachenko,Mukhamad-Basir Kodzoev,O Kalinina

doi:10.1051/e3sconf/201911001032

Abstract

The methods of disperse reinforcement of a concrete matrix with the help of fibers make it possible to manufacture structures of complex configuration and solve problems of frost resistance of products. Fiber replaces secondary reinforcement, reducing the volume of use of structural steel reinforcement. Cellular fibrous concrete is characterized by high performance properties, especially increased strength in bending and stretching, impact strength and crack resistance. As a reinforcing component, it is preferable to use mineral fibers or thin basalt fiber. The use of polyamide fiber is allowed, but there are difficulties in forming adhesive contacts between the fiber and the mineral matrix of cellular concrete. A feature of mineral fibers is that they are high adhesive to the cement matrix. One of the promising types of dispersed bulk reinforcement of lightweight concrete is the use of expanded vermiculite. Expanded vermiculite can simultaneously be considered as a reinforcing component of a lamellar structure, as a component that reduces the density of the material and its thermal conductivity, as well as improves the fire protection performance. Expanded vermiculite can be used both in piece cladding products and as a part of dry warm and fire retardant plaster mixes.*

Highlights

Despite a number of undeniable advantages, unreinforced concrete is characterized by low impact strength, low resistance to tearing, and the formation of shrinkage cracks in hardening
All this leads to a relatively low durability of articles made of such concretes [1,2,3]. These problems are solved by secondary reinforcement, which in structural concrete is carried out using steel reinforcement, and in the ceilings - metal mesh
If we summarize all the advantages that basalt fiber provides and foam-reinforced foam blocks, they are included in the reduction of economic costs for the construction of facilities, ensuring their reliable and durable operation

Summary

Introduction

Despite a number of undeniable advantages, unreinforced concrete is characterized by low impact strength, low resistance to tearing, and the formation of shrinkage cracks in hardening. All this leads to a relatively low durability of articles made of such concretes [1,2,3] These problems are solved by secondary reinforcement, which in structural concrete is carried out using steel reinforcement, and in the ceilings - metal mesh. Technologies for the use of dispersed reinforcement of a concrete matrix have been developed with the help of polypropylene, glass, basalt and metal fibers (see Fig. 1). These methods make it possible to manufacture structures of com-plex configuration, solve problems of frost resistance of products [4,5]. Expanded vermiculite (vermiculite) is a free-flowing, porous material in the form of scaly silver or yellow particles obtained by fast firing the vermiculite concentrate hydromica containing combined water between elementary layers

Experimental

Results

Discussion

Conclusions