DEFORMATION DIAGRAMS OF FINE-GRAINED HIGH-STRENGTH CONCRETE AND HIGH-STRENGTH STEEL-FIBRO CONCRETE UNDER COMPRESSION

Abstract

The unique properties of high-strength steel fiber concrete, such as reduced fragility, high crack resistance, increased tensile strength, and others, make this material quite attractive for using in various areas of construction. However, at present, our knowledge of the properties of this material is not yet supported by a sufficient amount of experimental data. The article aims to eliminate this gap. In our work is compared the behavior of the steel fiber concrete with rational fiber content and its matrix, fine-grained high-strength concrete under compression. The method used in the described experiments with the inclusion of a metal pipe acting as a force sensor and receiving a part of the load at stresses close to the design resistance of concrete allows to obtain the relative deformation values corresponding to prism strength. So, we get the opportunity to construct full strain diagrams of steel fiber concrete. As a result of the tests, the effect of a “clip” was confirmed: introduction of steel fiber into the concrete matrix causes a decrease in transverse deformations, increases crack resistance. The nature of the destruction also changes and becomes smoother. As a result of theoretical data processing, the dependences were corrected for calculating the characteristics of high-strength steel fiber concrete under the short-term action of a compressive load.