1,721,054 research outputs found
Prospettive di utilizzazione economica degli scarti dell’estrazione e lavorazione dei lapidei
No full textSurface treatment of ornamental stones by high-pressure, water-jet technology
No full textIn recent years, slabs with a rough surface have captured a large share of the ornamental stone market. However, the main technologies used for this type of treatment are based on mechanical shock (bush-hammering) or thermal treatment (flaming or flame-finishing). These traditional technologies are widely used, but have many limitations that decrease their usefulness. The purpose of this study was to develop a technology that enhances the natural colors of the rock and produces a rough surface without compromising its mechanical characteristics, in contrast to traditional technologies. This report shows the technical, economic and aesthetic results obtained with a new water-jet treatment and compares it with competing technologies
Developments in the surface finishing of ornamental rocks by high-pressure water jet without abrasive and proposal for an official name for the process
No full textDimension stones in the circular economy world
No full textThis paper is aimed to present a view on both Dimension Stone sector can meet Circular Economy conditions and expectations. The world quarry net product is expected to reach one hundred million tons in 2020 – this forecast is based on a prudent medium-term forecast. For this reason, it's believed that both geoscientists and policy makers should be focussing on dimension stone sector and its sustainable development
Working granite surfaces with a high-pressure water-jet: a comparison of abrasives and economic considerations
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Rough surface finishing of stone-faced sandwich panels using high pressure waterjet
No full textThe natural stone veneer used to clad sandwich panels needs to be less than 1 cm thick to ensure a lightweight structure. However, diminishing the thickness reduces slab strength, which is important when the stone is to be rough finished. Thus, traditional techniques such as bush-hammering and flaming are unfeasible for these veneers. The main aim of this study was to investigate the possibility of using high pressure waterjet technology for stone veneer finishing. First, the characteristics of the stone were determined (origin, petrography chemistry, strength). Suitable combinations of waterjet operating parameters (pressure, traverse speed, distance between successive passes) were then tested to determine optimal results in terms of both performance and aesthetics. The investigation demonstrated the success of this technique for processing large slabs (100 cm × 200 cm), with thickness of just 3 mm, thus also overcoming the problems involved in maneuvering heavy slabs with thickness of more than 2 cm. Surface roughness analysis of the treated stone showed it to compare favorably with competing technologies, with the advantage that waterjet maintains the natural color of the rock. Finally, some economic considerations are discussed
Chromaticism differentiations: A study of the diversified aesthetic appeal of the Ghiandone granite range
Full text linkThis paper presents the results of the study of the change in colour of the Ghiandone granite, which is typically used for ornamental purposes, and of all its mineral constituents, whenever undergoing different surface finishings. Changes in roughness as well as gloss were recorded, and put in relation to CIE colour parameters. The study was carried out by using a spectrophotometer, in order to measure the colour coordinates in CIE L*a*b* and CIE L*C*h colour spaces of those stone samples which have been treated following traditional methods (i.e. polishing, bush-hammering and flaming) and advanced technologies (i.e. pure water-jet and abrasive water-jet); sawplane surfaces (from traditional gangsaw and diamond disk) were also considered in this study. The results show that lightness (L*) is the colour coordinate that experiences a higher variation when different surface finishings are applied, especially bush-hammering. In the CIE L*C*h colour space, polished and pure water-jet finished samples are characterized by higher chroma values than the others samples which are featured by higher lightness. Hue doesn’t show any significant variation. When the total colour difference (ΔE*) is measured, pure water-jet also preserves the original colour of stone and minerals, similarly to the polishing. An inverse correlation between specular gloss values and mean average roughness have been documented
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