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The goal of this study is to assess the opportunity of utilizing waste iron filings in altered fractions as a fine aggregate replacement to produce the reactive powder concrete. Four different fractions of waste iron filing were adopted to reactive powder concrete mixture to measure the difference, which may be achieved in the strengths of the reactive powder concrete. In order to accomplish the aim of the investigation, compressive strength, and direct tensile strength were executed to determine the effect of iron filings on the strength of reactive powder concrete. Consistent with the experimental results, it can be stated that higher fraction of waste iron filings is more effective than the other percentages in both compressive and direct tensile strength because it acquires the maximum strength properties in the shortest duration. The increasing of the compressive strength and the direct tensile strength at 28 days for 30 % of the irons filings was 30.3% and 31.8% correspondingly.

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Reactive Powder Concrete (RPC) is the most commonly used type, known as Ultra High-Performance Concrete (UHPC). This type of concrete requires very low water/binder ratios to ensure that the microstructure is very dense and impermeable. Thus, it also needs special types of curing to ensure its high strength, high durability, and dimensional stability. The main target of this study is thus a comparison of different curing regimes to investigate their impacts on the mechanical performance of RPC. Three different curing regimes, Normal Curing (NC), Steam Curing (SC), and Boiling Curing (BC) were thus adopted in this study. To assess the mechanical behaviour of RPC, compressive strength, direct tensile strength, and density measures were implemented for the different curing regimes and SC and BC were compared with normal curing at various curing ages. The investigation results revealed that, among the three different curing approaches, the steam curing method most significantly enhanced the mechanical behaviour of the RPC, particularly compressive strength.