Abstract
The article deals with the application of combined reinforcement of fi-ne-grained concrete with steel wave and polypropylene fibers. High-density packaging of the mixture components was used to improve the strength and deformation characteristics. In order to reduce the cost of fibre concrete, composite binders were developed. Rational selection of filler and the use of a steel wave fiber gave the opportunity to get the fibre concrete with tensile compressive strength – 84.8 MPa, the tensile strength in bending – 19.8 MPa on technogenic sands of the Kursk Magnetic Anomaly. With combined reinforcement by steel and polypropylene fiber on technogenic sands of the Kursk magnetic anomaly fibre concrete with a tensile compressive strength – 82.8 MPa, in bending – 19.1 MPa was developed. With the same strength charac-teristics the developed mixture of fibre concrete based on combined re-inforcement due to reducing the amount of steel fiber at cost is lower by 25% compared to the composition on steel fiber and the same com-posite binder.
Highlights
Dispersed reinforcement can be carried out as with one type of fiber, and with a mixture of different fibers with different parameters and significantly different in composition
The most significant factors of cement content reduction in dispersed and reinforced fine-grained concretes are: reduction of water demand in concrete mixture and increase of binder activity. From this point of view, the use of composite binders is considered to be a promising direction to improve the efficiency of such concretes
In order to obtain high-quality fibre concrete, two types of fiber were implemented into the concrete matrix: steel wavy fiber, length 30 mm, diameter 0.8 mm; polypropylene fiber, length 6 mm (Fig. 1)
Summary
Dispersed reinforcement can be carried out as with one type of fiber, and with a mixture of different fibers with different parameters and significantly different in composition (for example, this article will consider the issue of combined reinforcement of fine-grained concrete by steel and propylene fiber). The use of dispersed reinforcement for reinforced concrete structures, in which part of the core reinforcement is replaced with fiber or eliminates it completely, is of prac-tical interest. Production of dispersed and reinforced composites and structures based on them depend to a large extent on the type of reinforcing materials (fibers) used for them [1 - 8]. For the manufacture of dispersed and reinforced structures conventional heavy concrete with a limited size of coarse aggregate grains, cement-sand mortar, as well as cement or gypsum stone are used. The type of concrete determines the nature of the rational type of dispersed reinforcement and the optimal values of the geometric parameters of the dispersed reinforcement [9-15]
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