Making fine and desert sands usable
The first stage processes fine and desert sands to form a fine sand flour. These fine sand flours are subsequently granulated with mineral binders in combination with special additives to produce pressure-resistant granules. The pellets are then used instead of gravel in concrete production.
As a rule, these fine sand flours are processed into made-to-measure pellets in sizes from 0 to 16 mm in optimal grading curves. With these granules and use of the dual Multicon high-speed mix technology, it is possible to manufacture high-quality concretes that are up to 25 % lighter, harden faster and, as a rule, within 24 hours after production show greater strengths than conventional standard concretes.
The dual concrete mixing technology developed by the Multicon GmbH makes it possible to produce more environmentally benign high-quality concrete at lower cost. The innovative Multicon technology leads to reduction in CO2 of up to 50 %. “The prime objective is to optimize the product concrete to the maximum extent possible and to make it viable for the future in terms of resource conservation,” says Dr. Leopold Halser, Managing Director of Multicon GmbH. “The manufacture of 1 ton of cement produces up to 800 kg of CO2. In mass concrete production, which as a rule consumes between 300 to 400 kg of cement worldwide, it would be possible with our technology to eliminate up to 100 kg of carbon dioxide emission per cubic meter,” continues the expert for suspension concrete, “Since the manufacture of CO2-reduced concretes will certainly be of global interest, the application of the patented Multicon process for concrete production worldwide would require direct collaboration with the cement industry for successful realization,” emphasizes Dr. Helmut Rosenlöcher, Technical Director with Multicon and inventor of the technology.
The Multicon technology enables processing of multi-material cements that have been developed by the cement industry to high-quality concretes suitable for mass application – which in turn could realize a global reduction of carbon dioxide emission on a large scale.
Avoidance of long transport routes
Multicon technology enables processing of existing local sand deposits that were until now not usable for concrete production. In this way, fine and also desert sands, for example, could be manufactured specifically on a made-to-measure basis for use as gravel aggregate in sizes up to 16 mm to achieve a perfect grading curve and mix composition. These granules can then be used in Multicon’s matrix-optimized suspension and ideally processed into concretes with sustainable properties.
Multicon sand processing plants and high-performance mixers can not only manufacture the raw materials of sand and gravel needed for concrete, but can also produce the high-quality concretes made of them. Expensive and environmentally damaging transport of the aggregate to the construction sites will then not be necessary. “Especially in the so-called MENA states, the demand for plants for processing desert sand in combination with the suspension technology is enormous,” explains Dr. Leopold Halser. The first plants have already been ordered and will soon be set up in Dubai and Egypt. Additional promising business contacts to Jordan, Bahrain, Saudi Arabia and Kuwait have already been established.
Using resources by market-specific solutions
Desert sand, due to its nature, has so far been of no use for the construction industry. This sand is too fine, it is geometrically round and the surface has been ground too smooth. The patented solution from Multicon for preparing this specific fine sand enables use of this resource in future. However, processing unused fine sands is of interest for Europe as well. In northern German regions – for example, in Mecklenburg-Western Pomerania as well as in large parts of Eastern Europe – there exist large quantities of previously unusable fine sands.
For the company Multicon it is therefore logically sensible to make use of the existing resources of naturally occurring sand and gravel, especially the non-usable fine-sand constituents from gravel pits, instead of disposing them until now and causing in this way extensive environmental damage. Here in Germany as well, and generally in Europe, the patented method for processing fine sands would be used. Here the prerequisites are different from those in the desert: research into the sustainability of concretes, in particular their resistance to frost, is currently underway in Germany and Europe. “The intermediate results of investigations into fine-sand concretes are quite promising, so that we assume that previously unused fine-sand deposits can be used in concrete production,” emphasizes Dr. Helmut Rosenlöcher.
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