Mechanical behaviour of steel fiber reinforced concrete with stone powder

Mário Dos Santos Periquito,Margareth Da Silva Magalhães

doi:10.1590/s1517-707620170002.0172

Mário Dos Santos Periquito, Margareth Da Silva Magalhães

Open Access

https://doi.org/10.1590/s1517-707620170002.0172

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Abstract

ABSTRACT Nowadays, there is an increasing interest in the development of eco-friendly materials. Thus, environmental challenges due to the necessity of reducing worldwide levels of CO2 emissions, to limit the energy consumption and to use industrial waste are promoting an increasing effort to find viable alternatives to minimize pollution from the main productive processes. Thus, this paper addresses the results of an investigation on the influence of stone powder, residue from the production of crushed aggregates, on the mechanical performance of concrete reinforced with steel fibers. The effect of the amount of stone powder sand was evaluated using 0%, 50% and 100% natural sand replacement. Workability and mechanical properties were evaluated by compressive, elastic modulus, four-point bending and abrasion tests. Economic impact study of the composite production was also carried out. Based on the results obtained, it is possible to conclude that the use of crushed stone sand in steel fiber reinforced concrete is beneficial in terms of the workability and abrasion resistance but was some disadvantages. For instance, when 100% manufactured sand was added, the compressive and bending strength was reduced. However, the elastic modulus was not changed. It is also important to highlight that with 100% stone powder content, the compressive strength is still higher than 30MPa and the cost for producing is about of 32% cheaper.

Highlights

In the last decades, steel fiber reinforced concrete (SFRC) has been used in many applications such as concrete pavements, overlays, patching repair of hydraulic structures, thin shells and precast products [1]
This paper addresses the results of an investigation on the influence of stone powder, residue from the production of crushed aggregates, on the mechanical performance of concrete reinforced with steel fibers
According to BENTUR and MINDESS [2], for the normal range of steel fiber contents, an increase in compressive strength ranging from nil to about 25% is expected

Summary

Introduction

Steel fiber reinforced concrete (SFRC) has been used in many applications such as concrete pavements, overlays, patching repair of hydraulic structures, thin shells and precast products [1]. When compared to the classic quasi-brittle behaviour of plain concrete structures, the SFRC exhibits increase in ductility and toughness as well as enhancement in resistance to fatigue and impact [2]. These benefits can be mobilized to construct more durable structures [3, 4]. There is a growing trend to use industrial wastes or by-products in the production of cementitious composite. A significant number of experimental studies have been conducted regarding the use of metal waste recycled fibers as reinforcement [5–7] and industrial wastes as admixtures or aggregate in the production of cementitious composite. The use of wastes in system of concrete elements has beneficial environmental and economic impacts, since an added commercial value is given to a sub-product industry that, in general, is considered a waste product

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