Abstract
This study evaluates the mechanical, durability, and residual compressive strength (after being exposed to 20, 120, 250, 400 and 600 °C) of mortar that uses recycled iron powder (RIP) as a fine aggregate. Within this context, mechanical strength, shrinkage, durability, and residual strength tests were performed on mortar made with seven different percentages (0%, 5%, 10%, 15%, 20%, 30% and 50%) of replacement of natural sand (NS) by RIP. It was found that the mechanical strength of mortar increased when replaced with up to 30% NS by RIP. In addition, the increase was 30% for compressive, 18% for tensile, and 47% for flexural strength at 28 days, respectively, compared to the reference mortar (mortar made with 100% NS). Shrinkage was observed for the mortar made with 100% NS, while both shrinkage and expansion occurred in the mortar made with RIP, especially for RIP higher than 5%. Furthermore, significantly lower porosity and capillary water absorption were observed for mortar made with up to 30% RIP, compared to that made with 100% NS, which decreased by 36% for porosity and 48% for water absorption. As the temperature increased, the strength decreased for all mixes, and the drop was more pronounced for the temperatures above 250 °C and 50% RIP. This study demonstrates that up to 30% RIP can be utilized as a fine aggregate in mortar due to its better mechanical and durability performances.
Highlights
It was observed that mortars made with recycled iron powder (RIP) had lower slump than the mortar made with natural sand (NS)
At 50% replacement the slump was 35% lower than the reference. This can be attributed to the highly angular and rough surface of RIP, whereas the NS is relatively round. This resulted in the reduction of the flowability of the mortar made with RIP, due to more interlocking of the particles in the mix
It is worth noting that, while some studies have been conducted on the mechanical properties of concrete containing RIP, limited information is available on mortars with
Summary
Inert, they are used to minimize costs, lessen shrinkage and creep, and improve the overall mechanical strength of concrete [1]. Ensuring the availability of good quality aggregates is essential for concrete construction. The material should be cheap, sustainable, and environmentally-friendly [2,3]. In the Netherlands, for example, the availability of river aggregates is decreasing due to high demand, leading to an increased need for alternative sources, such as the use of concrete waste as an aggregate [4].
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