Granite sands for concrete, asphalt and specialist building materials

Mineral raw materials form part of the unseen foundations of modern industrial production. Whether concrete, asphalt, plasters or floor coatings – many materials are based on precisely defined sands and aggregates.

At the same time, the demands on the uniformity, appearance and technical properties of these aggregates are rising significantly. At the bauma in Munich, Röhrig Granit is therefore showcasing specially processed granite sands and aggregates used across a wide range of industrial sectors. The focus here is not on traditional natural stone as a solid building material, but on the targeted mineral processing of granite for industrial applications. The family-run business operates granite quarries in the Odenwald region between Darmstadt and Heidelberg and, according to its own information, now supplies numerous sectors – from the concrete and asphalt industries to the plastics and coatings industries. Of particular interest is the specialisation in mineral material properties. Whilst many building materials are modified using chemical additives, the company deliberately relies on the natural composition of the granite.

Röhrig Granit processes mineral raw materials for specialist applications

According to the company, the material processing is based on the natural components of granite. These include, in particular, feldspar, quartz and mica. These mineral components are specifically processed to produce different grades of sand and aggregate. In the concrete industry in particular, the selection of suitable aggregates plays a central role. Grain size, surface structure and mineral composition significantly influence the strength, workability and visual properties of the resulting building material.

Röhrig Granit highlights specific applications in the concrete and plaster industry. There, mineral sands are used not only as technical aggregates but also, in some cases, as a design element. Particularly striking is the metallic effect described in certain materials. According to the company, this arises exclusively from the natural mineral composition of the granite. No additional chemical additives or artificial colourants are required for this. Such natural material effects are becoming increasingly important, particularly in the field of high-quality exposed concrete or decorative surfaces.

Granite sands are used in numerous industrial sectors

The areas of application extend far beyond traditional building material uses. According to the company, in addition to concrete plants and asphalt mixing plants, it also supplies the plastics, plaster and floor coating industries. This demonstrates just how versatile mineral raw materials are today. Modern industrial products often require precisely defined aggregates with reproducible properties. Key applications of processed granite sand:

• Concrete industry and facing concrete
• Asphalt mixing plants
• Plaster industry
• Floor coatings
• Plastics industry

Mineral processing replaces chemical additives

The material strategy presented here follows a trend that is becoming apparent in many sectors of the building materials industry. Greater use is to be made of natural raw materials to achieve desired material properties without additional chemical modification. This is not just a matter of sustainability, but also of technical stability. Mineral properties are permanently retained and often change less significantly than artificially created surface effects. High-quality plasters, coatings and exposed concrete in particular benefit from the natural light and textural effects of mineral aggregates. Mica content, for example, can create reflective effects, whilst varying proportions of quartz and feldspar influence colour and surface character. However, the processing of such materials requires precise process control. Even slight differences in mineral composition can cause visible changes in the final product.

Speciality raw materials are gaining importance for the building materials industry

This development reflects a major shift within the raw materials and building materials industry. Standardised mass-produced products are increasingly being supplemented by specialised material solutions. At the same time, demands on technical properties and visual quality are rising. As a result, mineral aggregates are evolving from simple raw materials into specifically tailored functional materials. In the concrete industry in particular, there is a growing demand for high-quality sands with defined properties. Röhrig Granit is thus positioning itself in a comparatively specialised market segment. The combination of in-house raw material extraction and targeted processing enables greater control over material quality and composition. This development is likely to become even more significant, particularly in the field of high-quality building materials. Architectural concretes, special plasters and industrial coatings increasingly require specific material characteristics that cannot be achieved using standard aggregates alone. The granite sands shown here make it clear that modern building materials have long since ceased to consist solely of basic functional materials. Appearance, surface finish and mineral properties are increasingly becoming part of technical product development – even in the case of seemingly simple raw materials such as sand and chippings.