Comparative analysis of strength and deformation of reinforced concrete and steel fiber concrete slabs

Mykola Surianinov,Stepan Neutov,Iryna Korneieva,S Semerikov,A Striuk,S Sakhno,H Danylchuk,O Bondarenko,V Solovieva,S Chukharev,V Osadchyi,T Vakaliuk,P Nechypurenko

doi:10.1051/e3sconf/202016606003

Mykola Surianinov, Stepan Neutov + Show 11 more

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https://doi.org/10.1051/e3sconf/202016606003

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Abstract

The results of experimental studies of the steel fiber influence on the bearing capacity, deformability and crack resistance of reinforced concrete multi-hollow plates are given. We investigated a serial floor slab and a similar one, but with the addition of steel fiber. Both plates are factory-made. For testing, the testing apparatus was designed and manufactured that made it possible to study full-size floor slabs in laboratory conditions. The tests were carried out according to a single-span scheme with the replacing equivalent load. The loading was carried out by applying two concentrated strip vertical loads along the plate width. The load was applied in steps of (0.04 ÷ 0.05) from the breaking load. Each stage ended with exposure lasting up to 10 minutes with fixing all the necessary parameters. Deformations were measured using dial gauges. From the moment the first crack appeared in the stretched zone of concrete, the process of crack formation and opening was monitored. At each level, using the Brunell tube, the width of their opening and height were measured. The moment of cracking in both slabs began at the same relative strain. It has been established that the bearing capacity and crack resistance of a slab of combined reinforcement using steel fiber are respectively 50 and 44% higher than that of a similar reinforced concrete slab. The maximum deflection of the slab of combined reinforcement is 37.5% lower than that of conventional reinforced concrete. The destruction of both slabs occurred under loads, when the relative deformations in the compressed zone of concrete reached 0.80×10-3 and 1.10×10-3 for reinforced concrete and steel-fiber concrete slabs, respectively, the difference is 37.5%.

Highlights

Hollow core slabs are usually used as slabs between floors in the construction of buildings and structures
3 The purpose of work The aim of this work is an experimental study of the influence of steel fiber on the bearing capacity, deformability and crack resistance of serial reinforced concrete multi-hollow slabs manufactured in the factory
From the presented results it is seen that the maximum deflection in a steel-fiber concrete slab is 37.5% less than in a similar reinforced concrete slab

Summary

Introduction

Hollow core slabs are usually used as slabs between floors in the construction of buildings and structures. Of various shapes and sizes, with different bearing patterns, they are all widely used in construction Their production accounts for a significant mass part of reinforced concrete of the total material consumption during the construction of the facility. This type of product can be called universal, because its use is not limited to the type of structure. The main distinguishing feature of such floor slabs is the presence of voids located along the slab. These voids almost always have a circular cross section. Characteristic is the manufacture of recessed grooves along the side faces. Such plates are pre-stressed and nonstressed by pouring into molds and subsequent vibration compaction with final heat treatment

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