Abstract
The state of Qatar suffers from the shortage of natural resources needed for concrete production. Therefore, it is essential to investigate the feasibility of using by-product recycled materials as aggregates to maintain the concrete construction industry. Several types of recyclable materials are currently used in concrete. One of the potential resources of recycled concrete is steel slag. Knowing that Steel slag is the most significant solid waste generated by Qatar Steel Company in Qatar, replacing of natural coarse aggregate with steel slag aggregate will have a significant environmental and economic impact to the state of Qatar. This paper presents the compression and flexural test results of different concrete mixes made of steel slag coarse aggregate combined with a newly developed basalt chopped fibres. The parameters investigated included the volume fraction of the fibre used and the type of coarse aggregates (natural aggregates “Gabbro” and steel slag aggregates). Plain concrete specimens containing natural coarse aggregates and steel slag aggregates with no fibres added were also tested to serve as control. Test results showed that adding the basalt chopped fibres to the concrete mixes enhanced their flexural tensile strengths at different percentages. In addition, the compressive strength of concrete made with steel slag aggregate was higher than that made with natural gabbro aggregate. Test results clearly showed that steel slag aggregates can be used as sustainable and eco-friendly alternative materials in concrete structures.
Highlights
The State of Qatar has experienced tremendous economic development in the last decades
It can be observed that adding a volume fraction of 0.25% to the Gabbro concrete resulted in an increase in the compressive strength of 17.4%
For concrete mixes with steel slag aggregates, adding volume fractions of 0.25% and 1% of the fibres to the mix resulted in an increase in the compressive strengths of 3.8% and 15.8%, respectively
Summary
The State of Qatar has experienced tremendous economic development in the last decades. A number of researchers studied the possibility of using steel slag in concrete mixes as a coarse aggregate to make sustainable concrete [3,4]. They reported that the use of the SSA improved the flexural and compressive strength of the concrete. A number of studies focused on determining the optimal replacement percentage of coarse and fine aggregates by steel slag to produce a concrete that would accommodate a higher strength than the normal concrete. This paper presents a part of a large research program that aims at investigating the feasibility of using SSA as a low-cost alternative sustainable material in fibre reinforced concrete (FRC). The results of preliminary tests that have been conducted to determine the properties of the obtained FRC are presented
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