Abstract
The purpose of this study is to analyze the feasibility of using the ultra-fine waste coming from the granite cutting waste gang saws (GCW-GS) to manufacture ultra-high performance, steel-fiber reinforced concrete (UHPFRC). These machines cut granite blocks by abrasion using a steel blade and slurry containing fine steel grit. The waste generated by gang saws (GCW-GS) contains up to 15% Fe2O3 and up to 5% CaO. This is the main difference from the waste produced by diamond saws (GCW-D). Although this waste is available in large quantities, there are very few studies focused on recycling it to manufacture any kind of concrete. In this study, the replaced material was the micronized quartz powder of natural origin used in the manufacture of UHPRFC. The properties tested include workability, density, compressive strength, elasticity modulus, flexural strength, and tensile strength. The final conclusion is that this waste can be used to manufacture UHPFRC with a better performance than that from diamond saws given that there is an improvement of their mechanical properties up to a replacement of 35%. Even for higher percentages, the mechanical properties are within values close to those of control concrete with small decreases.
Highlights
The construction sector is one of the industrial activities that consume the most natural resources and generate the most waste in the European Union
The results showed a higher compressive strength of ultra-high performance concrete (UHPC) when using iron ore tailings (IOT) with a maximum size of 1.18 mm as a replacement for quartz sand
The results showed that using 25–40% cutting waste granite has a positive effect on the strength and durability of concrete
Summary
Sujing Zhao et al analyzed the influence of this waste as an alternative to natural aggregate [5] Their results showed a loss of strength in the UHPC when incorporating the IOT. F. Kala [12] obtained similar results when incorporating granite powder as an alternative to fine aggregate in the manufacture of high-performance concretes. López 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. Work contrasts thesewith results with those obtained in the previous which wastes free of Fefree were used, in order influence of these
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