ИССЛЕДОВАНИЕ ДЕФОРМАТИВНЫХ СВОЙСТВ СТАЛЕФИБРОШЛАКОБЕТОНА ПРИ ОСЕВОМ РАСТЯЖЕНИИ И СЖАТИИ С УЧЕТОМ ЕГО ВОЗРАСТА

Abstract

The fact that the use of reinforced concrete structures produced from secondary wastes of different industries and local aggregates is stimulating a cost-effective consumption of material and energy resources, reduces costs and time of technological processes. The fine slag concrete is an example of such concretes; it is based on the screening dust of the cast slag crushed stone. One of the solutions aiming to improve the concrete quality is to introduce steel fibers into the slag-concrete mixture, because such fibers have high strength under tension and elastic modulus, which makes it possible not to use reinforecement rods in some structures. The aim of this study is to obtain computational formulas allowing to determine the deformation characteristics of the steel fiber slag reinforced concrete (SFSRC) under axial tension and compression taking into account the concrete age. Axial tension and compression tests were carried out using the samples produced from metallurgical slags of OAO “NLMK” with different volumetric contents of the fiber reinforcement. The tension tests were carried out using special experimental equipment. Compression tests were carried out in the IP-100 press and P-20 universal tensile testing machine. The experimental data analysis allowed modifying the dependences for the SFSRC samples, making an equation for determining the initial elasticity modulus for the t-aged SFSRC, drawing theoretical diagrams for the SFSRC samles under axial tension and compression. As a result, the curves built on the basis of the gained formulas showed a good compliance with the experimental data.