[7] showed an increase in the compressive, flexural, and tensile strength of HPC when using copper slag as an alternative to fine aggregate, while always maintaining the same workability of the mixture. For a 100% replacement, there are increases in compressive strength above 19%. Similarly, the results obtained by [PERSON] et al. [8] demonstrated the viability of manufacturing UHPC with a compressive strength greater than 150 MPa when incorporating copper slag. Granite cutting wastes (GCWs) have also been used to substitute some of the components of mortars or concretes. [PERSON] et al. [9] studied the feasibility of incorporating granite sludge as an alternative to cement in the manufacture of concrete and mortar. The results showed that for a 20% substitution, the variations in the mechanical properties are not relevant, as they observed an increase in resistance to abrasion and freeze-thaw cycles. For their part, [PERSON] et al. [10; 11] analyzed incorporating granite cutting waste as an alternative to fine aggregate in order to obtain more sustainable concretes. The results showed that using 25-40% cutting waste granite has a positive effect on the strength and durability of concrete. [PERSON] [12] obtained similar results when incorporating granite powder as an alternative to fine aggregate in the manufacture of high-performance concretes. Most of the studies carried out focus on the use of waste from the extractive industry to make conventional concrete or HPC, while few of them focus on the use of this waste for the manufacture of UHPC or UHPRC. [PERSON] et al. [13] analyzed the influence of incorporating waste from fluorite mines as an alternative to fine aggregate in the manufacture of UHPRC. The results show that a 70% substitution provides acceptable values of compressive strength, flexural strength, and tensile strength. The results obtained by [PERSON] et al. [14] are also along this line, and in their study they substituted micronized quartz for granite cutting waste in UHPC. The properties obtained for substitutions of 70% are comparable to those of the control concrete, while, for a ratio of 35%, an increase in compression, flexural, and tensile strength of the concrete was observed. In a previous work carried out by [PERSON] et al. [14], the substitution of micronized quartz by fine granite waste from diamond saws cutting machines (GCW-D) was analyzed with favorable results. The results showed an improvement in workability and compressive strength for a total replacement of micronized quartz. Both flexural strength and tensile strength increased for a 35% substitution, while for a replacement of 70%, the values obtained showed little variation with respect to the control concrete. In the present study, granite cutting waste from granite cutting machines (GCW-GS) called gang saws are used as an alternative to micronized quartz. Gang saws are a very economical system used as an alternative to diamond saws to cut granite blocks. With this type of machine, the granite block is cut by the abrasive effect of the forward and backward movements of steel plates watered by an aqueous mixture containing steel particles kept in suspension by the densification of the mixture with calcium oxide (CaO) (Figure 1). These wastes are different from those used in [14] as the waste is mixed with up to 15% Fe\({}_{2}\)O\({}_{3}\) and up to 5% CaO from the aqueous grout used in the cutting process of gang saws. The main objective of this work is to evaluate the behavior of UHPFRC when this waste is used. In addition, this work contrasts these results with those obtained in the previous study in which wastes free of Fe\({}_{2}\)O\({}_{3}\) and CaO were used, in order to analyze the influence of these two substances on the mechanical properties of UHPFRC.