Abstract
Abstract This study explores the potential of the granite residue to be applied as a supplementary cementitious material. Furthermore, the efficiency of grinding methods in the improvement of the residue reactivity was also evaluated. The granite residue was collected in a facility located in Brazil and used as a Portland cement replacement with a substitution rate of 25% in mass. The residue was submitted to wet, dry and additive dry grinding methods, with several different times. The cement-based composites were characterized by quantitative X-Ray diffraction using the Rietveld's method, thermogravimetric analysis, and compressive strength. In conclusion, there was observed a higher efficiency of the wet grinding method, followed by an increase in compressive strength results as grinding time increased. Furthermore, the portlandite content was lower in the cement-based composite with granite residue, especially in the samples ground for 60, 120, and 180 minutes; a fact that summed up with other results for the pozzolanic potential of the granite residue.
Highlights
The granite mining and processing industries are a growing business area with an average growth in the world production of 6% per year in the last ten years
The Portland cement industry has the capacity to absorb a huge volume of by-products; a fact that yields several advantages: environmental by the recycling of by-products; reduction of natural resources extraction; reduction of anthropogenic greenhouse gas associated with the production of cement clinker; and cement-based products with better properties than ordinary composites (Ihask and Hashim, 2015; Miller, 2018)
Recent studies have shown the potential of granite residue for application in the construction industry, such as viable composite blocks based on Portland cement; granite and marble residue for residential construction (Souza, et al, 2017); quarry granitic sludge residue as SCM for cement mortar, promoting a denser matrix with a 70% improvement in resistance to chlorides (Ramos, et al, 2013); and material suitable for replacing natural raw material in tile production (Torres, et al, 2009)
Summary
The granite mining and processing industries are a growing business area with an average growth in the world production of 6% per year in the last ten years. Recent studies have shown the potential of granite residue for application in the construction industry, such as viable composite blocks based on Portland cement; granite and marble residue for residential construction (Souza, et al, 2017); quarry granitic sludge residue as SCM for cement mortar, promoting a denser matrix with a 70% improvement in resistance to chlorides (Ramos, et al, 2013); and material suitable for replacing natural raw material in tile production (Torres, et al, 2009). A study on the utilization of granite residue as supplementary cementitious material on mortars is presented, along with its pozzolanic activity improvement by mechanical treatment. For this purpose, we considered different grinding methods and times, and performed an extensive characterization program on the raw and processed materials
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